/*! 2.9.2 */
var JSHINT;
if (typeof window === 'undefined') window = {};
(function () {
var require;
require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
var identifierStartTable = [];

for (var i = 0; i < 128; i++) {
  identifierStartTable[i] =
    i === 36 ||           // $
    i >= 65 && i <= 90 || // A-Z
    i === 95 ||           // _
    i >= 97 && i <= 122;  // a-z
}

var identifierPartTable = [];

for (var i = 0; i < 128; i++) {
  identifierPartTable[i] =
    identifierStartTable[i] || // $, _, A-Z, a-z
    i >= 48 && i <= 57;        // 0-9
}

module.exports = {
  asciiIdentifierStartTable: identifierStartTable,
  asciiIdentifierPartTable: identifierPartTable
};

},{}],2:[function(require,module,exports){
var str = '768,769,770,771,772,773,774,775,776,777,778,779,780,781,782,783,784,785,786,787,788,789,790,791,792,793,794,795,796,797,798,799,800,801,802,803,804,805,806,807,808,809,810,811,812,813,814,815,816,817,818,819,820,821,822,823,824,825,826,827,828,829,830,831,832,833,834,835,836,837,838,839,840,841,842,843,844,845,846,847,848,849,850,851,852,853,854,855,856,857,858,859,860,861,862,863,864,865,866,867,868,869,870,871,872,873,874,875,876,877,878,879,1155,1156,1157,1158,1159,1425,1426,1427,1428,1429,1430,1431,1432,1433,1434,1435,1436,1437,1438,1439,1440,1441,1442,1443,1444,1445,1446,1447,1448,1449,1450,1451,1452,1453,1454,1455,1456,1457,1458,1459,1460,1461,1462,1463,1464,1465,1466,1467,1468,1469,1471,1473,1474,1476,1477,1479,1552,1553,1554,1555,1556,1557,1558,1559,1560,1561,1562,1611,1612,1613,1614,1615,1616,1617,1618,1619,1620,1621,1622,1623,1624,1625,1626,1627,1628,1629,1630,1631,1632,1633,1634,1635,1636,1637,1638,1639,1640,1641,1648,1750,1751,1752,1753,1754,1755,1756,1759,1760,1761,1762,1763,1764,1767,1768,1770,1771,1772,1773,1776,1777,1778,1779,1780,1781,1782,1783,1784,1785,1809,1840,1841,1842,1843,1844,1845,1846,1847,1848,1849,1850,1851,1852,1853,1854,1855,1856,1857,1858,1859,1860,1861,1862,1863,1864,1865,1866,1958,1959,1960,1961,1962,1963,1964,1965,1966,1967,1968,1984,1985,1986,1987,1988,1989,1990,1991,1992,1993,2027,2028,2029,2030,2031,2032,2033,2034,2035,2070,2071,2072,2073,2075,2076,2077,2078,2079,2080,2081,2082,2083,2085,2086,2087,2089,2090,2091,2092,2093,2137,2138,2139,2276,2277,2278,2279,2280,2281,2282,2283,2284,2285,2286,2287,2288,2289,2290,2291,2292,2293,2294,2295,2296,2297,2298,2299,2300,2301,2302,2304,2305,2306,2307,2362,2363,2364,2366,2367,2368,2369,2370,2371,2372,2373,2374,2375,2376,2377,2378,2379,2380,2381,2382,2383,2385,2386,2387,2388,2389,2390,2391,2402,2403,2406,2407,2408,2409,2410,2411,2412,2413,2414,2415,2433,2434,2435,2492,2494,2495,2496,2497,2498,2499,2500,2503,2504,2507,2508,2509,2519,2530,2531,2534,2535,2536,2537,2538,2539,2540,2541,2542,2543,2561,2562,2563,2620,2622,2623,2624,2625,2626,2631,2632,2635,2636,2637,2641,2662,2663,2664,2665,2666,2667,2668,2669,2670,2671,2672,2673,2677,2689,2690,2691,2748,2750,2751,2752,2753,2754,2755,2756,2757,2759,2760,2761,2763,2764,2765,2786,2787,2790,2791,2792,2793,2794,2795,2796,2797,2798,2799,2817,2818,2819,2876,2878,2879,2880,2881,2882,2883,2884,2887,2888,2891,2892,2893,2902,2903,2914,2915,2918,2919,2920,2921,2922,2923,2924,2925,2926,2927,2946,3006,3007,3008,3009,3010,3014,3015,3016,3018,3019,3020,3021,3031,3046,3047,3048,3049,3050,3051,3052,3053,3054,3055,3073,3074,3075,3134,3135,3136,3137,3138,3139,3140,3142,3143,3144,3146,3147,3148,3149,3157,3158,3170,3171,3174,3175,3176,3177,3178,3179,3180,3181,3182,3183,3202,3203,3260,3262,3263,3264,3265,3266,3267,3268,3270,3271,3272,3274,3275,3276,3277,3285,3286,3298,3299,3302,3303,3304,3305,3306,3307,3308,3309,3310,3311,3330,3331,3390,3391,3392,3393,3394,3395,3396,3398,3399,3400,3402,3403,3404,3405,3415,3426,3427,3430,3431,3432,3433,3434,3435,3436,3437,3438,3439,3458,3459,3530,3535,3536,3537,3538,3539,3540,3542,3544,3545,3546,3547,3548,3549,3550,3551,3570,3571,3633,3636,3637,3638,3639,3640,3641,3642,3655,3656,3657,3658,3659,3660,3661,3662,3664,3665,3666,3667,3668,3669,3670,3671,3672,3673,3761,3764,3765,3766,3767,3768,3769,3771,3772,3784,3785,3786,3787,3788,3789,3792,3793,3794,3795,3796,3797,3798,3799,3800,3801,3864,3865,3872,3873,3874,3875,3876,3877,3878,3879,3880,3881,3893,3895,3897,3902,3903,3953,3954,3955,3956,3957,3958,3959,3960,3961,3962,3963,3964,3965,3966,3967,3968,3969,3970,3971,3972,3974,3975,3981,3982,3983,3984,3985,3986,3987,3988,3989,3990,3991,3993,3994,3995,3996,3997,3998,3999,4000,4001,4002,4003,4004,4005,4006,4007,4008,4009,4010,4011,4012,4013,4014,4015,4016,4017,4018,4019,4020,4021,4022,4023,4024,4025,4026,4027,4028,4038,4139,4140,4141,4142,4143,4144,4145,4146,4147,4148,4149,4150,4151,4152,4153,4154,4155,4156,4157,4158,4160,4161,4162,4163,4164,4165,4166,4167,4168,4169,4182,4183,4184,4185,4190,4191,4192,4194,4195,4196,4199,4200,4201,4202,4203,4204,4205,4209,4210,4211,4212,4226,4227,4228,4229,4230,4231,4232,4233,4234,4235,4236,4237,4239,4240,4241,4242,4243,4244,4245,4246,4247,4248,4249,4250,4251,4252,4253,4957,4958,4959,5906,5907,5908,5938,5939,5940,5970,5971,6002,6003,6068,6069,6070,6071,6072,6073,6074,6075,6076,6077,6078,6079,6080,6081,6082,6083,6084,6085,6086,6087,6088,6089,6090,6091,6092,6093,6094,6095,6096,6097,6098,6099,6109,6112,6113,6114,6115,6116,6117,6118,6119,6120,6121,6155,6156,6157,6160,6161,6162,6163,6164,6165,6166,6167,6168,6169,6313,6432,6433,6434,6435,6436,6437,6438,6439,6440,6441,6442,6443,6448,6449,6450,6451,6452,6453,6454,6455,6456,6457,6458,6459,6470,6471,6472,6473,6474,6475,6476,6477,6478,6479,6576,6577,6578,6579,6580,6581,6582,6583,6584,6585,6586,6587,6588,6589,6590,6591,6592,6600,6601,6608,6609,6610,6611,6612,6613,6614,6615,6616,6617,6679,6680,6681,6682,6683,6741,6742,6743,6744,6745,6746,6747,6748,6749,6750,6752,6753,6754,6755,6756,6757,6758,6759,6760,6761,6762,6763,6764,6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var arr = str.split(',').map(function(code) {
  return parseInt(code, 10);
});
module.exports = arr;
},{}],3:[function(require,module,exports){
var str = 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var arr = str.split(',').map(function(code) {
  return parseInt(code, 10);
});
module.exports = arr;
},{}],4:[function(require,module,exports){
// http://wiki.commonjs.org/wiki/Unit_Testing/1.0
//
// THIS IS NOT TESTED NOR LIKELY TO WORK OUTSIDE V8!
//
// Originally from narwhal.js (http://narwhaljs.org)
// Copyright (c) 2009 Thomas Robinson <280north.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the 'Software'), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

// when used in node, this will actually load the util module we depend on
// versus loading the builtin util module as happens otherwise
// this is a bug in node module loading as far as I am concerned
var util = require('util/');

var pSlice = Array.prototype.slice;
var hasOwn = Object.prototype.hasOwnProperty;

// 1. The assert module provides functions that throw
// AssertionError's when particular conditions are not met. The
// assert module must conform to the following interface.

var assert = module.exports = ok;

// 2. The AssertionError is defined in assert.
// new assert.AssertionError({ message: message,
//                             actual: actual,
//                             expected: expected })

assert.AssertionError = function AssertionError(options) {
  this.name = 'AssertionError';
  this.actual = options.actual;
  this.expected = options.expected;
  this.operator = options.operator;
  if (options.message) {
    this.message = options.message;
    this.generatedMessage = false;
  } else {
    this.message = getMessage(this);
    this.generatedMessage = true;
  }
  var stackStartFunction = options.stackStartFunction || fail;

  if (Error.captureStackTrace) {
    Error.captureStackTrace(this, stackStartFunction);
  }
  else {
    // non v8 browsers so we can have a stacktrace
    var err = new Error();
    if (err.stack) {
      var out = err.stack;

      // try to strip useless frames
      var fn_name = stackStartFunction.name;
      var idx = out.indexOf('\n' + fn_name);
      if (idx >= 0) {
        // once we have located the function frame
        // we need to strip out everything before it (and its line)
        var next_line = out.indexOf('\n', idx + 1);
        out = out.substring(next_line + 1);
      }

      this.stack = out;
    }
  }
};

// assert.AssertionError instanceof Error
util.inherits(assert.AssertionError, Error);

function replacer(key, value) {
  if (util.isUndefined(value)) {
    return '' + value;
  }
  if (util.isNumber(value) && !isFinite(value)) {
    return value.toString();
  }
  if (util.isFunction(value) || util.isRegExp(value)) {
    return value.toString();
  }
  return value;
}

function truncate(s, n) {
  if (util.isString(s)) {
    return s.length < n ? s : s.slice(0, n);
  } else {
    return s;
  }
}

function getMessage(self) {
  return truncate(JSON.stringify(self.actual, replacer), 128) + ' ' +
         self.operator + ' ' +
         truncate(JSON.stringify(self.expected, replacer), 128);
}

// At present only the three keys mentioned above are used and
// understood by the spec. Implementations or sub modules can pass
// other keys to the AssertionError's constructor - they will be
// ignored.

// 3. All of the following functions must throw an AssertionError
// when a corresponding condition is not met, with a message that
// may be undefined if not provided.  All assertion methods provide
// both the actual and expected values to the assertion error for
// display purposes.

function fail(actual, expected, message, operator, stackStartFunction) {
  throw new assert.AssertionError({
    message: message,
    actual: actual,
    expected: expected,
    operator: operator,
    stackStartFunction: stackStartFunction
  });
}

// EXTENSION! allows for well behaved errors defined elsewhere.
assert.fail = fail;

// 4. Pure assertion tests whether a value is truthy, as determined
// by !!guard.
// assert.ok(guard, message_opt);
// This statement is equivalent to assert.equal(true, !!guard,
// message_opt);. To test strictly for the value true, use
// assert.strictEqual(true, guard, message_opt);.

function ok(value, message) {
  if (!value) fail(value, true, message, '==', assert.ok);
}
assert.ok = ok;

// 5. The equality assertion tests shallow, coercive equality with
// ==.
// assert.equal(actual, expected, message_opt);

assert.equal = function equal(actual, expected, message) {
  if (actual != expected) fail(actual, expected, message, '==', assert.equal);
};

// 6. The non-equality assertion tests for whether two objects are not equal
// with != assert.notEqual(actual, expected, message_opt);

assert.notEqual = function notEqual(actual, expected, message) {
  if (actual == expected) {
    fail(actual, expected, message, '!=', assert.notEqual);
  }
};

// 7. The equivalence assertion tests a deep equality relation.
// assert.deepEqual(actual, expected, message_opt);

assert.deepEqual = function deepEqual(actual, expected, message) {
  if (!_deepEqual(actual, expected)) {
    fail(actual, expected, message, 'deepEqual', assert.deepEqual);
  }
};

function _deepEqual(actual, expected) {
  // 7.1. All identical values are equivalent, as determined by ===.
  if (actual === expected) {
    return true;

  } else if (util.isBuffer(actual) && util.isBuffer(expected)) {
    if (actual.length != expected.length) return false;

    for (var i = 0; i < actual.length; i++) {
      if (actual[i] !== expected[i]) return false;
    }

    return true;

  // 7.2. If the expected value is a Date object, the actual value is
  // equivalent if it is also a Date object that refers to the same time.
  } else if (util.isDate(actual) && util.isDate(expected)) {
    return actual.getTime() === expected.getTime();

  // 7.3 If the expected value is a RegExp object, the actual value is
  // equivalent if it is also a RegExp object with the same source and
  // properties (`global`, `multiline`, `lastIndex`, `ignoreCase`).
  } else if (util.isRegExp(actual) && util.isRegExp(expected)) {
    return actual.source === expected.source &&
           actual.global === expected.global &&
           actual.multiline === expected.multiline &&
           actual.lastIndex === expected.lastIndex &&
           actual.ignoreCase === expected.ignoreCase;

  // 7.4. Other pairs that do not both pass typeof value == 'object',
  // equivalence is determined by ==.
  } else if (!util.isObject(actual) && !util.isObject(expected)) {
    return actual == expected;

  // 7.5 For all other Object pairs, including Array objects, equivalence is
  // determined by having the same number of owned properties (as verified
  // with Object.prototype.hasOwnProperty.call), the same set of keys
  // (although not necessarily the same order), equivalent values for every
  // corresponding key, and an identical 'prototype' property. Note: this
  // accounts for both named and indexed properties on Arrays.
  } else {
    return objEquiv(actual, expected);
  }
}

function isArguments(object) {
  return Object.prototype.toString.call(object) == '[object Arguments]';
}

function objEquiv(a, b) {
  if (util.isNullOrUndefined(a) || util.isNullOrUndefined(b))
    return false;
  // an identical 'prototype' property.
  if (a.prototype !== b.prototype) return false;
  // if one is a primitive, the other must be same
  if (util.isPrimitive(a) || util.isPrimitive(b)) {
    return a === b;
  }
  var aIsArgs = isArguments(a),
      bIsArgs = isArguments(b);
  if ((aIsArgs && !bIsArgs) || (!aIsArgs && bIsArgs))
    return false;
  if (aIsArgs) {
    a = pSlice.call(a);
    b = pSlice.call(b);
    return _deepEqual(a, b);
  }
  var ka = objectKeys(a),
      kb = objectKeys(b),
      key, i;
  // having the same number of owned properties (keys incorporates
  // hasOwnProperty)
  if (ka.length != kb.length)
    return false;
  //the same set of keys (although not necessarily the same order),
  ka.sort();
  kb.sort();
  //~~~cheap key test
  for (i = ka.length - 1; i >= 0; i--) {
    if (ka[i] != kb[i])
      return false;
  }
  //equivalent values for every corresponding key, and
  //~~~possibly expensive deep test
  for (i = ka.length - 1; i >= 0; i--) {
    key = ka[i];
    if (!_deepEqual(a[key], b[key])) return false;
  }
  return true;
}

// 8. The non-equivalence assertion tests for any deep inequality.
// assert.notDeepEqual(actual, expected, message_opt);

assert.notDeepEqual = function notDeepEqual(actual, expected, message) {
  if (_deepEqual(actual, expected)) {
    fail(actual, expected, message, 'notDeepEqual', assert.notDeepEqual);
  }
};

// 9. The strict equality assertion tests strict equality, as determined by ===.
// assert.strictEqual(actual, expected, message_opt);

assert.strictEqual = function strictEqual(actual, expected, message) {
  if (actual !== expected) {
    fail(actual, expected, message, '===', assert.strictEqual);
  }
};

// 10. The strict non-equality assertion tests for strict inequality, as
// determined by !==.  assert.notStrictEqual(actual, expected, message_opt);

assert.notStrictEqual = function notStrictEqual(actual, expected, message) {
  if (actual === expected) {
    fail(actual, expected, message, '!==', assert.notStrictEqual);
  }
};

function expectedException(actual, expected) {
  if (!actual || !expected) {
    return false;
  }

  if (Object.prototype.toString.call(expected) == '[object RegExp]') {
    return expected.test(actual);
  } else if (actual instanceof expected) {
    return true;
  } else if (expected.call({}, actual) === true) {
    return true;
  }

  return false;
}

function _throws(shouldThrow, block, expected, message) {
  var actual;

  if (util.isString(expected)) {
    message = expected;
    expected = null;
  }

  try {
    block();
  } catch (e) {
    actual = e;
  }

  message = (expected && expected.name ? ' (' + expected.name + ').' : '.') +
            (message ? ' ' + message : '.');

  if (shouldThrow && !actual) {
    fail(actual, expected, 'Missing expected exception' + message);
  }

  if (!shouldThrow && expectedException(actual, expected)) {
    fail(actual, expected, 'Got unwanted exception' + message);
  }

  if ((shouldThrow && actual && expected &&
      !expectedException(actual, expected)) || (!shouldThrow && actual)) {
    throw actual;
  }
}

// 11. Expected to throw an error:
// assert.throws(block, Error_opt, message_opt);

assert.throws = function(block, /*optional*/error, /*optional*/message) {
  _throws.apply(this, [true].concat(pSlice.call(arguments)));
};

// EXTENSION! This is annoying to write outside this module.
assert.doesNotThrow = function(block, /*optional*/message) {
  _throws.apply(this, [false].concat(pSlice.call(arguments)));
};

assert.ifError = function(err) { if (err) {throw err;}};

var objectKeys = Object.keys || function (obj) {
  var keys = [];
  for (var key in obj) {
    if (hasOwn.call(obj, key)) keys.push(key);
  }
  return keys;
};

},{"util/":9}],5:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

function EventEmitter() {
  this._events = this._events || {};
  this._maxListeners = this._maxListeners || undefined;
}
module.exports = EventEmitter;

// Backwards-compat with node 0.10.x
EventEmitter.EventEmitter = EventEmitter;

EventEmitter.prototype._events = undefined;
EventEmitter.prototype._maxListeners = undefined;

// By default EventEmitters will print a warning if more than 10 listeners are
// added to it. This is a useful default which helps finding memory leaks.
EventEmitter.defaultMaxListeners = 10;

// Obviously not all Emitters should be limited to 10. This function allows
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function(n) {
  if (!isNumber(n) || n < 0 || isNaN(n))
    throw TypeError('n must be a positive number');
  this._maxListeners = n;
  return this;
};

EventEmitter.prototype.emit = function(type) {
  var er, handler, len, args, i, listeners;

  if (!this._events)
    this._events = {};

  // If there is no 'error' event listener then throw.
  if (type === 'error') {
    if (!this._events.error ||
        (isObject(this._events.error) && !this._events.error.length)) {
      er = arguments[1];
      if (er instanceof Error) {
        throw er; // Unhandled 'error' event
      }
      throw TypeError('Uncaught, unspecified "error" event.');
    }
  }

  handler = this._events[type];

  if (isUndefined(handler))
    return false;

  if (isFunction(handler)) {
    switch (arguments.length) {
      // fast cases
      case 1:
        handler.call(this);
        break;
      case 2:
        handler.call(this, arguments[1]);
        break;
      case 3:
        handler.call(this, arguments[1], arguments[2]);
        break;
      // slower
      default:
        len = arguments.length;
        args = new Array(len - 1);
        for (i = 1; i < len; i++)
          args[i - 1] = arguments[i];
        handler.apply(this, args);
    }
  } else if (isObject(handler)) {
    len = arguments.length;
    args = new Array(len - 1);
    for (i = 1; i < len; i++)
      args[i - 1] = arguments[i];

    listeners = handler.slice();
    len = listeners.length;
    for (i = 0; i < len; i++)
      listeners[i].apply(this, args);
  }

  return true;
};

EventEmitter.prototype.addListener = function(type, listener) {
  var m;

  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  if (!this._events)
    this._events = {};

  // To avoid recursion in the case that type === "newListener"! Before
  // adding it to the listeners, first emit "newListener".
  if (this._events.newListener)
    this.emit('newListener', type,
              isFunction(listener.listener) ?
              listener.listener : listener);

  if (!this._events[type])
    // Optimize the case of one listener. Don't need the extra array object.
    this._events[type] = listener;
  else if (isObject(this._events[type]))
    // If we've already got an array, just append.
    this._events[type].push(listener);
  else
    // Adding the second element, need to change to array.
    this._events[type] = [this._events[type], listener];

  // Check for listener leak
  if (isObject(this._events[type]) && !this._events[type].warned) {
    var m;
    if (!isUndefined(this._maxListeners)) {
      m = this._maxListeners;
    } else {
      m = EventEmitter.defaultMaxListeners;
    }

    if (m && m > 0 && this._events[type].length > m) {
      this._events[type].warned = true;
      console.error('(node) warning: possible EventEmitter memory ' +
                    'leak detected. %d listeners added. ' +
                    'Use emitter.setMaxListeners() to increase limit.',
                    this._events[type].length);
      if (typeof console.trace === 'function') {
        // not supported in IE 10
        console.trace();
      }
    }
  }

  return this;
};

EventEmitter.prototype.on = EventEmitter.prototype.addListener;

EventEmitter.prototype.once = function(type, listener) {
  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  var fired = false;

  function g() {
    this.removeListener(type, g);

    if (!fired) {
      fired = true;
      listener.apply(this, arguments);
    }
  }

  g.listener = listener;
  this.on(type, g);

  return this;
};

// emits a 'removeListener' event iff the listener was removed
EventEmitter.prototype.removeListener = function(type, listener) {
  var list, position, length, i;

  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  if (!this._events || !this._events[type])
    return this;

  list = this._events[type];
  length = list.length;
  position = -1;

  if (list === listener ||
      (isFunction(list.listener) && list.listener === listener)) {
    delete this._events[type];
    if (this._events.removeListener)
      this.emit('removeListener', type, listener);

  } else if (isObject(list)) {
    for (i = length; i-- > 0;) {
      if (list[i] === listener ||
          (list[i].listener && list[i].listener === listener)) {
        position = i;
        break;
      }
    }

    if (position < 0)
      return this;

    if (list.length === 1) {
      list.length = 0;
      delete this._events[type];
    } else {
      list.splice(position, 1);
    }

    if (this._events.removeListener)
      this.emit('removeListener', type, listener);
  }

  return this;
};

EventEmitter.prototype.removeAllListeners = function(type) {
  var key, listeners;

  if (!this._events)
    return this;

  // not listening for removeListener, no need to emit
  if (!this._events.removeListener) {
    if (arguments.length === 0)
      this._events = {};
    else if (this._events[type])
      delete this._events[type];
    return this;
  }

  // emit removeListener for all listeners on all events
  if (arguments.length === 0) {
    for (key in this._events) {
      if (key === 'removeListener') continue;
      this.removeAllListeners(key);
    }
    this.removeAllListeners('removeListener');
    this._events = {};
    return this;
  }

  listeners = this._events[type];

  if (isFunction(listeners)) {
    this.removeListener(type, listeners);
  } else {
    // LIFO order
    while (listeners.length)
      this.removeListener(type, listeners[listeners.length - 1]);
  }
  delete this._events[type];

  return this;
};

EventEmitter.prototype.listeners = function(type) {
  var ret;
  if (!this._events || !this._events[type])
    ret = [];
  else if (isFunction(this._events[type]))
    ret = [this._events[type]];
  else
    ret = this._events[type].slice();
  return ret;
};

EventEmitter.listenerCount = function(emitter, type) {
  var ret;
  if (!emitter._events || !emitter._events[type])
    ret = 0;
  else if (isFunction(emitter._events[type]))
    ret = 1;
  else
    ret = emitter._events[type].length;
  return ret;
};

function isFunction(arg) {
  return typeof arg === 'function';
}

function isNumber(arg) {
  return typeof arg === 'number';
}

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}

function isUndefined(arg) {
  return arg === void 0;
}

},{}],6:[function(require,module,exports){
if (typeof Object.create === 'function') {
  // implementation from standard node.js 'util' module
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    ctor.prototype = Object.create(superCtor.prototype, {
      constructor: {
        value: ctor,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
  };
} else {
  // old school shim for old browsers
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    var TempCtor = function () {}
    TempCtor.prototype = superCtor.prototype
    ctor.prototype = new TempCtor()
    ctor.prototype.constructor = ctor
  }
}

},{}],7:[function(require,module,exports){
// shim for using process in browser

var process = module.exports = {};
var queue = [];
var draining = false;

function drainQueue() {
    if (draining) {
        return;
    }
    draining = true;
    var currentQueue;
    var len = queue.length;
    while(len) {
        currentQueue = queue;
        queue = [];
        var i = -1;
        while (++i < len) {
            currentQueue[i]();
        }
        len = queue.length;
    }
    draining = false;
}
process.nextTick = function (fun) {
    queue.push(fun);
    if (!draining) {
        setTimeout(drainQueue, 0);
    }
};

process.title = 'browser';
process.browser = true;
process.env = {};
process.argv = [];
process.version = ''; // empty string to avoid regexp issues
process.versions = {};

function noop() {}

process.on = noop;
process.addListener = noop;
process.once = noop;
process.off = noop;
process.removeListener = noop;
process.removeAllListeners = noop;
process.emit = noop;

process.binding = function (name) {
    throw new Error('process.binding is not supported');
};

// TODO(shtylman)
process.cwd = function () { return '/' };
process.chdir = function (dir) {
    throw new Error('process.chdir is not supported');
};
process.umask = function() { return 0; };

},{}],8:[function(require,module,exports){
module.exports = function isBuffer(arg) {
  return arg && typeof arg === 'object'
    && typeof arg.copy === 'function'
    && typeof arg.fill === 'function'
    && typeof arg.readUInt8 === 'function';
}
},{}],9:[function(require,module,exports){
(function (process,global){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

var formatRegExp = /%[sdj%]/g;
exports.format = function(f) {
  if (!isString(f)) {
    var objects = [];
    for (var i = 0; i < arguments.length; i++) {
      objects.push(inspect(arguments[i]));
    }
    return objects.join(' ');
  }

  var i = 1;
  var args = arguments;
  var len = args.length;
  var str = String(f).replace(formatRegExp, function(x) {
    if (x === '%%') return '%';
    if (i >= len) return x;
    switch (x) {
      case '%s': return String(args[i++]);
      case '%d': return Number(args[i++]);
      case '%j':
        try {
          return JSON.stringify(args[i++]);
        } catch (_) {
          return '[Circular]';
        }
      default:
        return x;
    }
  });
  for (var x = args[i]; i < len; x = args[++i]) {
    if (isNull(x) || !isObject(x)) {
      str += ' ' + x;
    } else {
      str += ' ' + inspect(x);
    }
  }
  return str;
};


// Mark that a method should not be used.
// Returns a modified function which warns once by default.
// If --no-deprecation is set, then it is a no-op.
exports.deprecate = function(fn, msg) {
  // Allow for deprecating things in the process of starting up.
  if (isUndefined(global.process)) {
    return function() {
      return exports.deprecate(fn, msg).apply(this, arguments);
    };
  }

  if (process.noDeprecation === true) {
    return fn;
  }

  var warned = false;
  function deprecated() {
    if (!warned) {
      if (process.throwDeprecation) {
        throw new Error(msg);
      } else if (process.traceDeprecation) {
        console.trace(msg);
      } else {
        console.error(msg);
      }
      warned = true;
    }
    return fn.apply(this, arguments);
  }

  return deprecated;
};


var debugs = {};
var debugEnviron;
exports.debuglog = function(set) {
  if (isUndefined(debugEnviron))
    debugEnviron = process.env.NODE_DEBUG || '';
  set = set.toUpperCase();
  if (!debugs[set]) {
    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
      var pid = process.pid;
      debugs[set] = function() {
        var msg = exports.format.apply(exports, arguments);
        console.error('%s %d: %s', set, pid, msg);
      };
    } else {
      debugs[set] = function() {};
    }
  }
  return debugs[set];
};


/**
 * Echos the value of a value. Trys to print the value out
 * in the best way possible given the different types.
 *
 * @param {Object} obj The object to print out.
 * @param {Object} opts Optional options object that alters the output.
 */
/* legacy: obj, showHidden, depth, colors*/
function inspect(obj, opts) {
  // default options
  var ctx = {
    seen: [],
    stylize: stylizeNoColor
  };
  // legacy...
  if (arguments.length >= 3) ctx.depth = arguments[2];
  if (arguments.length >= 4) ctx.colors = arguments[3];
  if (isBoolean(opts)) {
    // legacy...
    ctx.showHidden = opts;
  } else if (opts) {
    // got an "options" object
    exports._extend(ctx, opts);
  }
  // set default options
  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
  if (isUndefined(ctx.depth)) ctx.depth = 2;
  if (isUndefined(ctx.colors)) ctx.colors = false;
  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
  if (ctx.colors) ctx.stylize = stylizeWithColor;
  return formatValue(ctx, obj, ctx.depth);
}
exports.inspect = inspect;


// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
inspect.colors = {
  'bold' : [1, 22],
  'italic' : [3, 23],
  'underline' : [4, 24],
  'inverse' : [7, 27],
  'white' : [37, 39],
  'grey' : [90, 39],
  'black' : [30, 39],
  'blue' : [34, 39],
  'cyan' : [36, 39],
  'green' : [32, 39],
  'magenta' : [35, 39],
  'red' : [31, 39],
  'yellow' : [33, 39]
};

// Don't use 'blue' not visible on cmd.exe
inspect.styles = {
  'special': 'cyan',
  'number': 'yellow',
  'boolean': 'yellow',
  'undefined': 'grey',
  'null': 'bold',
  'string': 'green',
  'date': 'magenta',
  // "name": intentionally not styling
  'regexp': 'red'
};


function stylizeWithColor(str, styleType) {
  var style = inspect.styles[styleType];

  if (style) {
    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
           '\u001b[' + inspect.colors[style][1] + 'm';
  } else {
    return str;
  }
}


function stylizeNoColor(str, styleType) {
  return str;
}


function arrayToHash(array) {
  var hash = {};

  array.forEach(function(val, idx) {
    hash[val] = true;
  });

  return hash;
}


function formatValue(ctx, value, recurseTimes) {
  // Provide a hook for user-specified inspect functions.
  // Check that value is an object with an inspect function on it
  if (ctx.customInspect &&
      value &&
      isFunction(value.inspect) &&
      // Filter out the util module, it's inspect function is special
      value.inspect !== exports.inspect &&
      // Also filter out any prototype objects using the circular check.
      !(value.constructor && value.constructor.prototype === value)) {
    var ret = value.inspect(recurseTimes, ctx);
    if (!isString(ret)) {
      ret = formatValue(ctx, ret, recurseTimes);
    }
    return ret;
  }

  // Primitive types cannot have properties
  var primitive = formatPrimitive(ctx, value);
  if (primitive) {
    return primitive;
  }

  // Look up the keys of the object.
  var keys = Object.keys(value);
  var visibleKeys = arrayToHash(keys);

  if (ctx.showHidden) {
    keys = Object.getOwnPropertyNames(value);
  }

  // IE doesn't make error fields non-enumerable
  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
  if (isError(value)
      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
    return formatError(value);
  }

  // Some type of object without properties can be shortcutted.
  if (keys.length === 0) {
    if (isFunction(value)) {
      var name = value.name ? ': ' + value.name : '';
      return ctx.stylize('[Function' + name + ']', 'special');
    }
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    }
    if (isDate(value)) {
      return ctx.stylize(Date.prototype.toString.call(value), 'date');
    }
    if (isError(value)) {
      return formatError(value);
    }
  }

  var base = '', array = false, braces = ['{', '}'];

  // Make Array say that they are Array
  if (isArray(value)) {
    array = true;
    braces = ['[', ']'];
  }

  // Make functions say that they are functions
  if (isFunction(value)) {
    var n = value.name ? ': ' + value.name : '';
    base = ' [Function' + n + ']';
  }

  // Make RegExps say that they are RegExps
  if (isRegExp(value)) {
    base = ' ' + RegExp.prototype.toString.call(value);
  }

  // Make dates with properties first say the date
  if (isDate(value)) {
    base = ' ' + Date.prototype.toUTCString.call(value);
  }

  // Make error with message first say the error
  if (isError(value)) {
    base = ' ' + formatError(value);
  }

  if (keys.length === 0 && (!array || value.length == 0)) {
    return braces[0] + base + braces[1];
  }

  if (recurseTimes < 0) {
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    } else {
      return ctx.stylize('[Object]', 'special');
    }
  }

  ctx.seen.push(value);

  var output;
  if (array) {
    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
  } else {
    output = keys.map(function(key) {
      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
    });
  }

  ctx.seen.pop();

  return reduceToSingleString(output, base, braces);
}


function formatPrimitive(ctx, value) {
  if (isUndefined(value))
    return ctx.stylize('undefined', 'undefined');
  if (isString(value)) {
    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
                                             .replace(/'/g, "\\'")
                                             .replace(/\\"/g, '"') + '\'';
    return ctx.stylize(simple, 'string');
  }
  if (isNumber(value))
    return ctx.stylize('' + value, 'number');
  if (isBoolean(value))
    return ctx.stylize('' + value, 'boolean');
  // For some reason typeof null is "object", so special case here.
  if (isNull(value))
    return ctx.stylize('null', 'null');
}


function formatError(value) {
  return '[' + Error.prototype.toString.call(value) + ']';
}


function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
  var output = [];
  for (var i = 0, l = value.length; i < l; ++i) {
    if (hasOwnProperty(value, String(i))) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
          String(i), true));
    } else {
      output.push('');
    }
  }
  keys.forEach(function(key) {
    if (!key.match(/^\d+$/)) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
          key, true));
    }
  });
  return output;
}


function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
  var name, str, desc;
  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
  if (desc.get) {
    if (desc.set) {
      str = ctx.stylize('[Getter/Setter]', 'special');
    } else {
      str = ctx.stylize('[Getter]', 'special');
    }
  } else {
    if (desc.set) {
      str = ctx.stylize('[Setter]', 'special');
    }
  }
  if (!hasOwnProperty(visibleKeys, key)) {
    name = '[' + key + ']';
  }
  if (!str) {
    if (ctx.seen.indexOf(desc.value) < 0) {
      if (isNull(recurseTimes)) {
        str = formatValue(ctx, desc.value, null);
      } else {
        str = formatValue(ctx, desc.value, recurseTimes - 1);
      }
      if (str.indexOf('\n') > -1) {
        if (array) {
          str = str.split('\n').map(function(line) {
            return '  ' + line;
          }).join('\n').substr(2);
        } else {
          str = '\n' + str.split('\n').map(function(line) {
            return '   ' + line;
          }).join('\n');
        }
      }
    } else {
      str = ctx.stylize('[Circular]', 'special');
    }
  }
  if (isUndefined(name)) {
    if (array && key.match(/^\d+$/)) {
      return str;
    }
    name = JSON.stringify('' + key);
    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
      name = name.substr(1, name.length - 2);
      name = ctx.stylize(name, 'name');
    } else {
      name = name.replace(/'/g, "\\'")
                 .replace(/\\"/g, '"')
                 .replace(/(^"|"$)/g, "'");
      name = ctx.stylize(name, 'string');
    }
  }

  return name + ': ' + str;
}


function reduceToSingleString(output, base, braces) {
  var numLinesEst = 0;
  var length = output.reduce(function(prev, cur) {
    numLinesEst++;
    if (cur.indexOf('\n') >= 0) numLinesEst++;
    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
  }, 0);

  if (length > 60) {
    return braces[0] +
           (base === '' ? '' : base + '\n ') +
           ' ' +
           output.join(',\n  ') +
           ' ' +
           braces[1];
  }

  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
}


// NOTE: These type checking functions intentionally don't use `instanceof`
// because it is fragile and can be easily faked with `Object.create()`.
function isArray(ar) {
  return Array.isArray(ar);
}
exports.isArray = isArray;

function isBoolean(arg) {
  return typeof arg === 'boolean';
}
exports.isBoolean = isBoolean;

function isNull(arg) {
  return arg === null;
}
exports.isNull = isNull;

function isNullOrUndefined(arg) {
  return arg == null;
}
exports.isNullOrUndefined = isNullOrUndefined;

function isNumber(arg) {
  return typeof arg === 'number';
}
exports.isNumber = isNumber;

function isString(arg) {
  return typeof arg === 'string';
}
exports.isString = isString;

function isSymbol(arg) {
  return typeof arg === 'symbol';
}
exports.isSymbol = isSymbol;

function isUndefined(arg) {
  return arg === void 0;
}
exports.isUndefined = isUndefined;

function isRegExp(re) {
  return isObject(re) && objectToString(re) === '[object RegExp]';
}
exports.isRegExp = isRegExp;

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}
exports.isObject = isObject;

function isDate(d) {
  return isObject(d) && objectToString(d) === '[object Date]';
}
exports.isDate = isDate;

function isError(e) {
  return isObject(e) &&
      (objectToString(e) === '[object Error]' || e instanceof Error);
}
exports.isError = isError;

function isFunction(arg) {
  return typeof arg === 'function';
}
exports.isFunction = isFunction;

function isPrimitive(arg) {
  return arg === null ||
         typeof arg === 'boolean' ||
         typeof arg === 'number' ||
         typeof arg === 'string' ||
         typeof arg === 'symbol' ||  // ES6 symbol
         typeof arg === 'undefined';
}
exports.isPrimitive = isPrimitive;

exports.isBuffer = require('./support/isBuffer');

function objectToString(o) {
  return Object.prototype.toString.call(o);
}


function pad(n) {
  return n < 10 ? '0' + n.toString(10) : n.toString(10);
}


var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
              'Oct', 'Nov', 'Dec'];

// 26 Feb 16:19:34
function timestamp() {
  var d = new Date();
  var time = [pad(d.getHours()),
              pad(d.getMinutes()),
              pad(d.getSeconds())].join(':');
  return [d.getDate(), months[d.getMonth()], time].join(' ');
}


// log is just a thin wrapper to console.log that prepends a timestamp
exports.log = function() {
  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
};


/**
 * Inherit the prototype methods from one constructor into another.
 *
 * The Function.prototype.inherits from lang.js rewritten as a standalone
 * function (not on Function.prototype). NOTE: If this file is to be loaded
 * during bootstrapping this function needs to be rewritten using some native
 * functions as prototype setup using normal JavaScript does not work as
 * expected during bootstrapping (see mirror.js in r114903).
 *
 * @param {function} ctor Constructor function which needs to inherit the
 *     prototype.
 * @param {function} superCtor Constructor function to inherit prototype from.
 */
exports.inherits = require('inherits');

exports._extend = function(origin, add) {
  // Don't do anything if add isn't an object
  if (!add || !isObject(add)) return origin;

  var keys = Object.keys(add);
  var i = keys.length;
  while (i--) {
    origin[keys[i]] = add[keys[i]];
  }
  return origin;
};

function hasOwnProperty(obj, prop) {
  return Object.prototype.hasOwnProperty.call(obj, prop);
}

}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./support/isBuffer":8,"_process":7,"inherits":6}],10:[function(require,module,exports){
(function (global){
/*global window, global*/
var util = require("util")
var assert = require("assert")
var now = require("date-now")

var slice = Array.prototype.slice
var console
var times = {}

if (typeof global !== "undefined" && global.console) {
    console = global.console
} else if (typeof window !== "undefined" && window.console) {
    console = window.console
} else {
    console = {}
}

var functions = [
    [log, "log"],
    [info, "info"],
    [warn, "warn"],
    [error, "error"],
    [time, "time"],
    [timeEnd, "timeEnd"],
    [trace, "trace"],
    [dir, "dir"],
    [consoleAssert, "assert"]
]

for (var i = 0; i < functions.length; i++) {
    var tuple = functions[i]
    var f = tuple[0]
    var name = tuple[1]

    if (!console[name]) {
        console[name] = f
    }
}

module.exports = console

function log() {}

function info() {
    console.log.apply(console, arguments)
}

function warn() {
    console.log.apply(console, arguments)
}

function error() {
    console.warn.apply(console, arguments)
}

function time(label) {
    times[label] = now()
}

function timeEnd(label) {
    var time = times[label]
    if (!time) {
        throw new Error("No such label: " + label)
    }

    var duration = now() - time
    console.log(label + ": " + duration + "ms")
}

function trace() {
    var err = new Error()
    err.name = "Trace"
    err.message = util.format.apply(null, arguments)
    console.error(err.stack)
}

function dir(object) {
    console.log(util.inspect(object) + "\n")
}

function consoleAssert(expression) {
    if (!expression) {
        var arr = slice.call(arguments, 1)
        assert.ok(false, util.format.apply(null, arr))
    }
}

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"assert":4,"date-now":11,"util":9}],11:[function(require,module,exports){
module.exports = now

function now() {
    return new Date().getTime()
}

},{}],12:[function(require,module,exports){
(function (global){
/**
 * @license
 * lodash 3.7.0 (Custom Build) <https://lodash.com/>
 * Build: `lodash modern -d -o ./index.js`
 * Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
 * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
 * Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
 * Available under MIT license <https://lodash.com/license>
 */
;(function() {

  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
  var undefined;

  /** Used as the semantic version number. */
  var VERSION = '3.7.0';

  /** Used to compose bitmasks for wrapper metadata. */
  var BIND_FLAG = 1,
      BIND_KEY_FLAG = 2,
      CURRY_BOUND_FLAG = 4,
      CURRY_FLAG = 8,
      CURRY_RIGHT_FLAG = 16,
      PARTIAL_FLAG = 32,
      PARTIAL_RIGHT_FLAG = 64,
      ARY_FLAG = 128,
      REARG_FLAG = 256;

  /** Used as default options for `_.trunc`. */
  var DEFAULT_TRUNC_LENGTH = 30,
      DEFAULT_TRUNC_OMISSION = '...';

  /** Used to detect when a function becomes hot. */
  var HOT_COUNT = 150,
      HOT_SPAN = 16;

  /** Used to indicate the type of lazy iteratees. */
  var LAZY_DROP_WHILE_FLAG = 0,
      LAZY_FILTER_FLAG = 1,
      LAZY_MAP_FLAG = 2;

  /** Used as the `TypeError` message for "Functions" methods. */
  var FUNC_ERROR_TEXT = 'Expected a function';

  /** Used as the internal argument placeholder. */
  var PLACEHOLDER = '__lodash_placeholder__';

  /** `Object#toString` result references. */
  var argsTag = '[object Arguments]',
      arrayTag = '[object Array]',
      boolTag = '[object Boolean]',
      dateTag = '[object Date]',
      errorTag = '[object Error]',
      funcTag = '[object Function]',
      mapTag = '[object Map]',
      numberTag = '[object Number]',
      objectTag = '[object Object]',
      regexpTag = '[object RegExp]',
      setTag = '[object Set]',
      stringTag = '[object String]',
      weakMapTag = '[object WeakMap]';

  var arrayBufferTag = '[object ArrayBuffer]',
      float32Tag = '[object Float32Array]',
      float64Tag = '[object Float64Array]',
      int8Tag = '[object Int8Array]',
      int16Tag = '[object Int16Array]',
      int32Tag = '[object Int32Array]',
      uint8Tag = '[object Uint8Array]',
      uint8ClampedTag = '[object Uint8ClampedArray]',
      uint16Tag = '[object Uint16Array]',
      uint32Tag = '[object Uint32Array]';

  /** Used to match empty string literals in compiled template source. */
  var reEmptyStringLeading = /\b__p \+= '';/g,
      reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
      reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;

  /** Used to match HTML entities and HTML characters. */
  var reEscapedHtml = /&(?:amp|lt|gt|quot|#39|#96);/g,
      reUnescapedHtml = /[&<>"'`]/g,
      reHasEscapedHtml = RegExp(reEscapedHtml.source),
      reHasUnescapedHtml = RegExp(reUnescapedHtml.source);

  /** Used to match template delimiters. */
  var reEscape = /<%-([\s\S]+?)%>/g,
      reEvaluate = /<%([\s\S]+?)%>/g,
      reInterpolate = /<%=([\s\S]+?)%>/g;

  /** Used to match property names within property paths. */
  var reIsDeepProp = /\.|\[(?:[^[\]]+|(["'])(?:(?!\1)[^\n\\]|\\.)*?)\1\]/,
      reIsPlainProp = /^\w*$/,
      rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\n\\]|\\.)*?)\2)\]/g;

  /**
   * Used to match `RegExp` [special characters](http://www.regular-expressions.info/characters.html#special).
   * In addition to special characters the forward slash is escaped to allow for
   * easier `eval` use and `Function` compilation.
   */
  var reRegExpChars = /[.*+?^${}()|[\]\/\\]/g,
      reHasRegExpChars = RegExp(reRegExpChars.source);

  /** Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks). */
  var reComboMark = /[\u0300-\u036f\ufe20-\ufe23]/g;

  /** Used to match backslashes in property paths. */
  var reEscapeChar = /\\(\\)?/g;

  /** Used to match [ES template delimiters](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-template-literal-lexical-components). */
  var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;

  /** Used to match `RegExp` flags from their coerced string values. */
  var reFlags = /\w*$/;

  /** Used to detect hexadecimal string values. */
  var reHasHexPrefix = /^0[xX]/;

  /** Used to detect host constructors (Safari > 5). */
  var reIsHostCtor = /^\[object .+?Constructor\]$/;

  /** Used to match latin-1 supplementary letters (excluding mathematical operators). */
  var reLatin1 = /[\xc0-\xd6\xd8-\xde\xdf-\xf6\xf8-\xff]/g;

  /** Used to ensure capturing order of template delimiters. */
  var reNoMatch = /($^)/;

  /** Used to match unescaped characters in compiled string literals. */
  var reUnescapedString = /['\n\r\u2028\u2029\\]/g;

  /** Used to match words to create compound words. */
  var reWords = (function() {
    var upper = '[A-Z\\xc0-\\xd6\\xd8-\\xde]',
        lower = '[a-z\\xdf-\\xf6\\xf8-\\xff]+';

    return RegExp(upper + '+(?=' + upper + lower + ')|' + upper + '?' + lower + '|' + upper + '+|[0-9]+', 'g');
  }());

  /** Used to detect and test for whitespace. */
  var whitespace = (
    // Basic whitespace characters.
    ' \t\x0b\f\xa0\ufeff' +

    // Line terminators.
    '\n\r\u2028\u2029' +

    // Unicode category "Zs" space separators.
    '\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000'
  );

  /** Used to assign default `context` object properties. */
  var contextProps = [
    'Array', 'ArrayBuffer', 'Date', 'Error', 'Float32Array', 'Float64Array',
    'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Math', 'Number',
    'Object', 'RegExp', 'Set', 'String', '_', 'clearTimeout', 'document',
    'isFinite', 'parseInt', 'setTimeout', 'TypeError', 'Uint8Array',
    'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap',
    'window'
  ];

  /** Used to make template sourceURLs easier to identify. */
  var templateCounter = -1;

  /** Used to identify `toStringTag` values of typed arrays. */
  var typedArrayTags = {};
  typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
  typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
  typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
  typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
  typedArrayTags[uint32Tag] = true;
  typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
  typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
  typedArrayTags[dateTag] = typedArrayTags[errorTag] =
  typedArrayTags[funcTag] = typedArrayTags[mapTag] =
  typedArrayTags[numberTag] = typedArrayTags[objectTag] =
  typedArrayTags[regexpTag] = typedArrayTags[setTag] =
  typedArrayTags[stringTag] = typedArrayTags[weakMapTag] = false;

  /** Used to identify `toStringTag` values supported by `_.clone`. */
  var cloneableTags = {};
  cloneableTags[argsTag] = cloneableTags[arrayTag] =
  cloneableTags[arrayBufferTag] = cloneableTags[boolTag] =
  cloneableTags[dateTag] = cloneableTags[float32Tag] =
  cloneableTags[float64Tag] = cloneableTags[int8Tag] =
  cloneableTags[int16Tag] = cloneableTags[int32Tag] =
  cloneableTags[numberTag] = cloneableTags[objectTag] =
  cloneableTags[regexpTag] = cloneableTags[stringTag] =
  cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
  cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
  cloneableTags[errorTag] = cloneableTags[funcTag] =
  cloneableTags[mapTag] = cloneableTags[setTag] =
  cloneableTags[weakMapTag] = false;

  /** Used as an internal `_.debounce` options object by `_.throttle`. */
  var debounceOptions = {
    'leading': false,
    'maxWait': 0,
    'trailing': false
  };

  /** Used to map latin-1 supplementary letters to basic latin letters. */
  var deburredLetters = {
    '\xc0': 'A',  '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A',
    '\xe0': 'a',  '\xe1': 'a', '\xe2': 'a', '\xe3': 'a', '\xe4': 'a', '\xe5': 'a',
    '\xc7': 'C',  '\xe7': 'c',
    '\xd0': 'D',  '\xf0': 'd',
    '\xc8': 'E',  '\xc9': 'E', '\xca': 'E', '\xcb': 'E',
    '\xe8': 'e',  '\xe9': 'e', '\xea': 'e', '\xeb': 'e',
    '\xcC': 'I',  '\xcd': 'I', '\xce': 'I', '\xcf': 'I',
    '\xeC': 'i',  '\xed': 'i', '\xee': 'i', '\xef': 'i',
    '\xd1': 'N',  '\xf1': 'n',
    '\xd2': 'O',  '\xd3': 'O', '\xd4': 'O', '\xd5': 'O', '\xd6': 'O', '\xd8': 'O',
    '\xf2': 'o',  '\xf3': 'o', '\xf4': 'o', '\xf5': 'o', '\xf6': 'o', '\xf8': 'o',
    '\xd9': 'U',  '\xda': 'U', '\xdb': 'U', '\xdc': 'U',
    '\xf9': 'u',  '\xfa': 'u', '\xfb': 'u', '\xfc': 'u',
    '\xdd': 'Y',  '\xfd': 'y', '\xff': 'y',
    '\xc6': 'Ae', '\xe6': 'ae',
    '\xde': 'Th', '\xfe': 'th',
    '\xdf': 'ss'
  };

  /** Used to map characters to HTML entities. */
  var htmlEscapes = {
    '&': '&amp;',
    '<': '&lt;',
    '>': '&gt;',
    '"': '&quot;',
    "'": '&#39;',
    '`': '&#96;'
  };

  /** Used to map HTML entities to characters. */
  var htmlUnescapes = {
    '&amp;': '&',
    '&lt;': '<',
    '&gt;': '>',
    '&quot;': '"',
    '&#39;': "'",
    '&#96;': '`'
  };

  /** Used to determine if values are of the language type `Object`. */
  var objectTypes = {
    'function': true,
    'object': true
  };

  /** Used to escape characters for inclusion in compiled string literals. */
  var stringEscapes = {
    '\\': '\\',
    "'": "'",
    '\n': 'n',
    '\r': 'r',
    '\u2028': 'u2028',
    '\u2029': 'u2029'
  };

  /** Detect free variable `exports`. */
  var freeExports = objectTypes[typeof exports] && exports && !exports.nodeType && exports;

  /** Detect free variable `module`. */
  var freeModule = objectTypes[typeof module] && module && !module.nodeType && module;

  /** Detect free variable `global` from Node.js. */
  var freeGlobal = freeExports && freeModule && typeof global == 'object' && global && global.Object && global;

  /** Detect free variable `self`. */
  var freeSelf = objectTypes[typeof self] && self && self.Object && self;

  /** Detect free variable `window`. */
  var freeWindow = objectTypes[typeof window] && window && window.Object && window;

  /** Detect the popular CommonJS extension `module.exports`. */
  var moduleExports = freeModule && freeModule.exports === freeExports && freeExports;

  /**
   * Used as a reference to the global object.
   *
   * The `this` value is used if it is the global object to avoid Greasemonkey's
   * restricted `window` object, otherwise the `window` object is used.
   */
  var root = freeGlobal || ((freeWindow !== (this && this.window)) && freeWindow) || freeSelf || this;

  /*--------------------------------------------------------------------------*/

  /**
   * The base implementation of `compareAscending` which compares values and
   * sorts them in ascending order without guaranteeing a stable sort.
   *
   * @private
   * @param {*} value The value to compare to `other`.
   * @param {*} other The value to compare to `value`.
   * @returns {number} Returns the sort order indicator for `value`.
   */
  function baseCompareAscending(value, other) {
    if (value !== other) {
      var valIsReflexive = value === value,
          othIsReflexive = other === other;

      if (value > other || !valIsReflexive || (value === undefined && othIsReflexive)) {
        return 1;
      }
      if (value < other || !othIsReflexive || (other === undefined && valIsReflexive)) {
        return -1;
      }
    }
    return 0;
  }

  /**
   * The base implementation of `_.findIndex` and `_.findLastIndex` without
   * support for callback shorthands and `this` binding.
   *
   * @private
   * @param {Array} array The array to search.
   * @param {Function} predicate The function invoked per iteration.
   * @param {boolean} [fromRight] Specify iterating from right to left.
   * @returns {number} Returns the index of the matched value, else `-1`.
   */
  function baseFindIndex(array, predicate, fromRight) {
    var length = array.length,
        index = fromRight ? length : -1;

    while ((fromRight ? index-- : ++index < length)) {
      if (predicate(array[index], index, array)) {
        return index;
      }
    }
    return -1;
  }

  /**
   * The base implementation of `_.indexOf` without support for binary searches.
   *
   * @private
   * @param {Array} array The array to search.
   * @param {*} value The value to search for.
   * @param {number} fromIndex The index to search from.
   * @returns {number} Returns the index of the matched value, else `-1`.
   */
  function baseIndexOf(array, value, fromIndex) {
    if (value !== value) {
      return indexOfNaN(array, fromIndex);
    }
    var index = fromIndex - 1,
        length = array.length;

    while (++index < length) {
      if (array[index] === value) {
        return index;
      }
    }
    return -1;
  }

  /**
   * The base implementation of `_.isFunction` without support for environments
   * with incorrect `typeof` results.
   *
   * @private
   * @param {*} value The value to check.
   * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
   */
  function baseIsFunction(value) {
    // Avoid a Chakra JIT bug in compatibility modes of IE 11.
    // See https://github.com/jashkenas/underscore/issues/1621 for more details.
    return typeof value == 'function' || false;
  }

  /**
   * Converts `value` to a string if it is not one. An empty string is returned
   * for `null` or `undefined` values.
   *
   * @private
   * @param {*} value The value to process.
   * @returns {string} Returns the string.
   */
  function baseToString(value) {
    if (typeof value == 'string') {
      return value;
    }
    return value == null ? '' : (value + '');
  }

  /**
   * Used by `_.max` and `_.min` as the default callback for string values.
   *
   * @private
   * @param {string} string The string to inspect.
   * @returns {number} Returns the code unit of the first character of the string.
   */
  function charAtCallback(string) {
    return string.charCodeAt(0);
  }

  /**
   * Used by `_.trim` and `_.trimLeft` to get the index of the first character
   * of `string` that is not found in `chars`.
   *
   * @private
   * @param {string} string The string to inspect.
   * @param {string} chars The characters to find.
   * @returns {number} Returns the index of the first character not found in `chars`.
   */
  function charsLeftIndex(string, chars) {
    var index = -1,
        length = string.length;

    while (++index < length && chars.indexOf(string.charAt(index)) > -1) {}
    return index;
  }

  /**
   * Used by `_.trim` and `_.trimRight` to get the index of the last character
   * of `string` that is not found in `chars`.
   *
   * @private
   * @param {string} string The string to inspect.
   * @param {string} chars The characters to find.
   * @returns {number} Returns the index of the last character not found in `chars`.
   */
  function charsRightIndex(string, chars) {
    var index = string.length;

    while (index-- && chars.indexOf(string.charAt(index)) > -1) {}
    return index;
  }

  /**
   * Used by `_.sortBy` to compare transformed elements of a collection and stable
   * sort them in ascending order.
   *
   * @private
   * @param {Object} object The object to compare to `other`.
   * @param {Object} other The object to compare to `object`.
   * @returns {number} Returns the sort order indicator for `object`.
   */
  function compareAscending(object, other) {
    return baseCompareAscending(object.criteria, other.criteria) || (object.index - other.index);
  }

  /**
   * Used by `_.sortByOrder` to compare multiple properties of each element
   * in a collection and stable sort them in the following order:
   *
   * If `orders` is unspecified, sort in ascending order for all properties.
   * Otherwise, for each property, sort in ascending order if its corresponding value in
   * orders is true, and descending order if false.
   *
   * @private
   * @param {Object} object The object to compare to `other`.
   * @param {Object} other The object to compare to `object`.
   * @param {boolean[]} orders The order to sort by for each property.
   * @returns {number} Returns the sort order indicator for `object`.
   */
  function compareMultiple(object, other, orders) {
    var index = -1,
        objCriteria = object.criteria,
        othCriteria = other.criteria,
        length = objCriteria.length,
        ordersLength = orders.length;

    while (++index < length) {
      var result = baseCompareAscending(objCriteria[index], othCriteria[index]);
      if (result) {
        if (index >= ordersLength) {
          return result;
        }
        return result * (orders[index] ? 1 : -1);
      }
    }
    // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
    // that causes it, under certain circumstances, to provide the same value for
    // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
    // for more details.
    //
    // This also ensures a stable sort in V8 and other engines.
    // See https://code.google.com/p/v8/issues/detail?id=90 for more details.
    return object.index - other.index;
  }

  /**
   * Used by `_.deburr` to convert latin-1 supplementary letters to basic latin letters.
   *
   * @private
   * @param {string} letter The matched letter to deburr.
   * @returns {string} Returns the deburred letter.
   */
  function deburrLetter(letter) {
    return deburredLetters[letter];
  }

  /**
   * Used by `_.escape` to convert characters to HTML entities.
   *
   * @private
   * @param {string} chr The matched character to escape.
   * @returns {string} Returns the escaped character.
   */
  function escapeHtmlChar(chr) {
    return htmlEscapes[chr];
  }

  /**
   * Used by `_.template` to escape characters for inclusion in compiled
   * string literals.
   *
   * @private
   * @param {string} chr The matched character to escape.
   * @returns {string} Returns the escaped character.
   */
  function escapeStringChar(chr) {
    return '\\' + stringEscapes[chr];
  }

  /**
   * Gets the index at which the first occurrence of `NaN` is found in `array`.
   *
   * @private
   * @param {Array} array The array to search.
   * @param {number} fromIndex The index to search from.
   * @param {boolean} [fromRight] Specify iterating from right to left.
   * @returns {number} Returns the index of the matched `NaN`, else `-1`.
   */
  function indexOfNaN(array, fromIndex, fromRight) {
    var length = array.length,
        index = fromIndex + (fromRight ? 0 : -1);

    while ((fromRight ? index-- : ++index < length)) {
      var other = array[index];
      if (other !== other) {
        return index;
      }
    }
    return -1;
  }

  /**
   * Checks if `value` is object-like.
   *
   * @private
   * @param {*} value The value to check.
   * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
   */
  function isObjectLike(value) {
    return !!value && typeof value == 'object';
  }

  /**
   * Used by `trimmedLeftIndex` and `trimmedRightIndex` to determine if a
   * character code is whitespace.
   *
   * @private
   * @param {number} charCode The character code to inspect.
   * @returns {boolean} Returns `true` if `charCode` is whitespace, else `false`.
   */
  function isSpace(charCode) {
    return ((charCode <= 160 && (charCode >= 9 && charCode <= 13) || charCode == 32 || charCode == 160) || charCode == 5760 || charCode == 6158 ||
      (charCode >= 8192 && (charCode <= 8202 || charCode == 8232 || charCode == 8233 || charCode == 8239 || charCode == 8287 || charCode == 12288 || charCode == 65279)));
  }

  /**
   * Replaces all `placeholder` elements in `array` with an internal placeholder
   * and returns an array of their indexes.
   *
   * @private
   * @param {Array} array The array to modify.
   * @param {*} placeholder The placeholder to replace.
   * @returns {Array} Returns the new array of placeholder indexes.
   */
  function replaceHolders(array, placeholder) {
    var index = -1,
        length = array.length,
        resIndex = -1,
        result = [];

    while (++index < length) {
      if (array[index] === placeholder) {
        array[index] = PLACEHOLDER;
        result[++resIndex] = index;
      }
    }
    return result;
  }

  /**
   * An implementation of `_.uniq` optimized for sorted arrays without support
   * for callback shorthands and `this` binding.
   *
   * @private
   * @param {Array} array The array to inspect.
   * @param {Function} [iteratee] The function invoked per iteration.
   * @returns {Array} Returns the new duplicate-value-free array.
   */
  function sortedUniq(array, iteratee) {
    var seen,
        index = -1,
        length = array.length,
        resIndex = -1,
        result = [];

    while (++index < length) {
      var value = array[index],
          computed = iteratee ? iteratee(value, index, array) : value;

      if (!index || seen !== computed) {
        seen = computed;
        result[++resIndex] = value;
      }
    }
    return result;
  }

  /**
   * Used by `_.trim` and `_.trimLeft` to get the index of the first non-whitespace
   * character of `string`.
   *
   * @private
   * @param {string} string The string to inspect.
   * @returns {number} Returns the index of the first non-whitespace character.
   */
  function trimmedLeftIndex(string) {
    var index = -1,
        length = string.length;

    while (++index < length && isSpace(string.charCodeAt(index))) {}
    return index;
  }

  /**
   * Used by `_.trim` and `_.trimRight` to get the index of the last non-whitespace
   * character of `string`.
   *
   * @private
   * @param {string} string The string to inspect.
   * @returns {number} Returns the index of the last non-whitespace character.
   */
  function trimmedRightIndex(string) {
    var index = string.length;

    while (index-- && isSpace(string.charCodeAt(index))) {}
    return index;
  }

  /**
   * Used by `_.unescape` to convert HTML entities to characters.
   *
   * @private
   * @param {string} chr The matched character to unescape.
   * @returns {string} Returns the unescaped character.
   */
  function unescapeHtmlChar(chr) {
    return htmlUnescapes[chr];
  }

  /*--------------------------------------------------------------------------*/

  /**
   * Create a new pristine `lodash` function using the given `context` object.
   *
   * @static
   * @memberOf _
   * @category Utility
   * @param {Object} [context=root] The context object.
   * @returns {Function} Returns a new `lodash` function.
   * @example
   *
   * _.mixin({ 'foo': _.constant('foo') });
   *
   * var lodash = _.runInContext();
   * lodash.mixin({ 'bar': lodash.constant('bar') });
   *
   * _.isFunction(_.foo);
   * // => true
   * _.isFunction(_.bar);
   * // => false
   *
   * lodash.isFunction(lodash.foo);
   * // => false
   * lodash.isFunction(lodash.bar);
   * // => true
   *
   * // using `context` to mock `Date#getTime` use in `_.now`
   * var mock = _.runInContext({
   *   'Date': function() {
   *     return { 'getTime': getTimeMock };
   *   }
   * });
   *
   * // or creating a suped-up `defer` in Node.js
   * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer;
   */
  function runInContext(context) {
    // Avoid issues with some ES3 environments that attempt to use values, named
    // after built-in constructors like `Object`, for the creation of literals.
    // ES5 clears this up by stating that literals must use built-in constructors.
    // See https://es5.github.io/#x11.1.5 for more details.
    context = context ? _.defaults(root.Object(), context, _.pick(root, contextProps)) : root;

    /** Native constructor references. */
    var Array = context.Array,
        Date = context.Date,
        Error = context.Error,
        Function = context.Function,
        Math = context.Math,
        Number = context.Number,
        Object = context.Object,
        RegExp = context.RegExp,
        String = context.String,
        TypeError = context.TypeError;

    /** Used for native method references. */
    var arrayProto = Array.prototype,
        objectProto = Object.prototype,
        stringProto = String.prototype;

    /** Used to detect DOM support. */
    var document = (document = context.window) && document.document;

    /** Used to resolve the decompiled source of functions. */
    var fnToString = Function.prototype.toString;

    /** Used to check objects for own properties. */
    var hasOwnProperty = objectProto.hasOwnProperty;

    /** Used to generate unique IDs. */
    var idCounter = 0;

    /**
     * Used to resolve the [`toStringTag`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.prototype.tostring)
     * of values.
     */
    var objToString = objectProto.toString;

    /** Used to restore the original `_` reference in `_.noConflict`. */
    var oldDash = context._;

    /** Used to detect if a method is native. */
    var reIsNative = RegExp('^' +
      escapeRegExp(objToString)
      .replace(/toString|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
    );

    /** Native method references. */
    var ArrayBuffer = isNative(ArrayBuffer = context.ArrayBuffer) && ArrayBuffer,
        bufferSlice = isNative(bufferSlice = ArrayBuffer && new ArrayBuffer(0).slice) && bufferSlice,
        ceil = Math.ceil,
        clearTimeout = context.clearTimeout,
        floor = Math.floor,
        getOwnPropertySymbols = isNative(getOwnPropertySymbols = Object.getOwnPropertySymbols) && getOwnPropertySymbols,
        getPrototypeOf = isNative(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf,
        push = arrayProto.push,
        preventExtensions = isNative(Object.preventExtensions = Object.preventExtensions) && preventExtensions,
        propertyIsEnumerable = objectProto.propertyIsEnumerable,
        Set = isNative(Set = context.Set) && Set,
        setTimeout = context.setTimeout,
        splice = arrayProto.splice,
        Uint8Array = isNative(Uint8Array = context.Uint8Array) && Uint8Array,
        WeakMap = isNative(WeakMap = context.WeakMap) && WeakMap;

    /** Used to clone array buffers. */
    var Float64Array = (function() {
      // Safari 5 errors when using an array buffer to initialize a typed array
      // where the array buffer's `byteLength` is not a multiple of the typed
      // array's `BYTES_PER_ELEMENT`.
      try {
        var func = isNative(func = context.Float64Array) && func,
            result = new func(new ArrayBuffer(10), 0, 1) && func;
      } catch(e) {}
      return result;
    }());

    /** Used as `baseAssign`. */
    var nativeAssign = (function() {
      // Avoid `Object.assign` in Firefox 34-37 which have an early implementation
      // with a now defunct try/catch behavior. See https://bugzilla.mozilla.org/show_bug.cgi?id=1103344
      // for more details.
      //
      // Use `Object.preventExtensions` on a plain object instead of simply using
      // `Object('x')` because Chrome and IE fail to throw an error when attempting
      // to assign values to readonly indexes of strings in strict mode.
      var object = { '1': 0 },
          func = preventExtensions && isNative(func = Object.assign) && func;

      try { func(preventExtensions(object), 'xo'); } catch(e) {}
      return !object[1] && func;
    }());

    /* Native method references for those with the same name as other `lodash` methods. */
    var nativeIsArray = isNative(nativeIsArray = Array.isArray) && nativeIsArray,
        nativeCreate = isNative(nativeCreate = Object.create) && nativeCreate,
        nativeIsFinite = context.isFinite,
        nativeKeys = isNative(nativeKeys = Object.keys) && nativeKeys,
        nativeMax = Math.max,
        nativeMin = Math.min,
        nativeNow = isNative(nativeNow = Date.now) && nativeNow,
        nativeNumIsFinite = isNative(nativeNumIsFinite = Number.isFinite) && nativeNumIsFinite,
        nativeParseInt = context.parseInt,
        nativeRandom = Math.random;

    /** Used as references for `-Infinity` and `Infinity`. */
    var NEGATIVE_INFINITY = Number.NEGATIVE_INFINITY,
        POSITIVE_INFINITY = Number.POSITIVE_INFINITY;

    /** Used as references for the maximum length and index of an array. */
    var MAX_ARRAY_LENGTH = Math.pow(2, 32) - 1,
        MAX_ARRAY_INDEX =  MAX_ARRAY_LENGTH - 1,
        HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1;

    /** Used as the size, in bytes, of each `Float64Array` element. */
    var FLOAT64_BYTES_PER_ELEMENT = Float64Array ? Float64Array.BYTES_PER_ELEMENT : 0;

    /**
     * Used as the [maximum length](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-number.max_safe_integer)
     * of an array-like value.
     */
    var MAX_SAFE_INTEGER = Math.pow(2, 53) - 1;

    /** Used to store function metadata. */
    var metaMap = WeakMap && new WeakMap;

    /** Used to lookup unminified function names. */
    var realNames = {};

    /*------------------------------------------------------------------------*/

    /**
     * Creates a `lodash` object which wraps `value` to enable implicit chaining.
     * Methods that operate on and return arrays, collections, and functions can
     * be chained together. Methods that return a boolean or single value will
     * automatically end the chain returning the unwrapped value. Explicit chaining
     * may be enabled using `_.chain`. The execution of chained methods is lazy,
     * that is, execution is deferred until `_#value` is implicitly or explicitly
     * called.
     *
     * Lazy evaluation allows several methods to support shortcut fusion. Shortcut
     * fusion is an optimization that merges iteratees to avoid creating intermediate
     * arrays and reduce the number of iteratee executions.
     *
     * Chaining is supported in custom builds as long as the `_#value` method is
     * directly or indirectly included in the build.
     *
     * In addition to lodash methods, wrappers have `Array` and `String` methods.
     *
     * The wrapper `Array` methods are:
     * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`,
     * `splice`, and `unshift`
     *
     * The wrapper `String` methods are:
     * `replace` and `split`
     *
     * The wrapper methods that support shortcut fusion are:
     * `compact`, `drop`, `dropRight`, `dropRightWhile`, `dropWhile`, `filter`,
     * `first`, `initial`, `last`, `map`, `pluck`, `reject`, `rest`, `reverse`,
     * `slice`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, `toArray`,
     * and `where`
     *
     * The chainable wrapper methods are:
     * `after`, `ary`, `assign`, `at`, `before`, `bind`, `bindAll`, `bindKey`,
     * `callback`, `chain`, `chunk`, `commit`, `compact`, `concat`, `constant`,
     * `countBy`, `create`, `curry`, `debounce`, `defaults`, `defer`, `delay`,
     * `difference`, `drop`, `dropRight`, `dropRightWhile`, `dropWhile`, `fill`,
     * `filter`, `flatten`, `flattenDeep`, `flow`, `flowRight`, `forEach`,
     * `forEachRight`, `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `functions`,
     * `groupBy`, `indexBy`, `initial`, `intersection`, `invert`, `invoke`, `keys`,
     * `keysIn`, `map`, `mapValues`, `matches`, `matchesProperty`, `memoize`,
     * `merge`, `mixin`, `negate`, `omit`, `once`, `pairs`, `partial`, `partialRight`,
     * `partition`, `pick`, `plant`, `pluck`, `property`, `propertyOf`, `pull`,
     * `pullAt`, `push`, `range`, `rearg`, `reject`, `remove`, `rest`, `reverse`,
     * `shuffle`, `slice`, `sort`, `sortBy`, `sortByAll`, `sortByOrder`, `splice`,
     * `spread`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, `tap`,
     * `throttle`, `thru`, `times`, `toArray`, `toPlainObject`, `transform`,
     * `union`, `uniq`, `unshift`, `unzip`, `values`, `valuesIn`, `where`,
     * `without`, `wrap`, `xor`, `zip`, and `zipObject`
     *
     * The wrapper methods that are **not** chainable by default are:
     * `add`, `attempt`, `camelCase`, `capitalize`, `clone`, `cloneDeep`, `deburr`,
     * `endsWith`, `escape`, `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`,
     * `findLast`, `findLastIndex`, `findLastKey`, `findWhere`, `first`, `has`,
     * `identity`, `includes`, `indexOf`, `inRange`, `isArguments`, `isArray`,
     * `isBoolean`, `isDate`, `isElement`, `isEmpty`, `isEqual`, `isError`, `isFinite`
     * `isFunction`, `isMatch`, `isNative`, `isNaN`, `isNull`, `isNumber`, `isObject`,
     * `isPlainObject`, `isRegExp`, `isString`, `isUndefined`, `isTypedArray`,
     * `join`, `kebabCase`, `last`, `lastIndexOf`, `max`, `min`, `noConflict`,
     * `noop`, `now`, `pad`, `padLeft`, `padRight`, `parseInt`, `pop`, `random`,
     * `reduce`, `reduceRight`, `repeat`, `result`, `runInContext`, `shift`, `size`,
     * `snakeCase`, `some`, `sortedIndex`, `sortedLastIndex`, `startCase`, `startsWith`,
     * `sum`, `template`, `trim`, `trimLeft`, `trimRight`, `trunc`, `unescape`,
     * `uniqueId`, `value`, and `words`
     *
     * The wrapper method `sample` will return a wrapped value when `n` is provided,
     * otherwise an unwrapped value is returned.
     *
     * @name _
     * @constructor
     * @category Chain
     * @param {*} value The value to wrap in a `lodash` instance.
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * var wrapped = _([1, 2, 3]);
     *
     * // returns an unwrapped value
     * wrapped.reduce(function(total, n) {
     *   return total + n;
     * });
     * // => 6
     *
     * // returns a wrapped value
     * var squares = wrapped.map(function(n) {
     *   return n * n;
     * });
     *
     * _.isArray(squares);
     * // => false
     *
     * _.isArray(squares.value());
     * // => true
     */
    function lodash(value) {
      if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) {
        if (value instanceof LodashWrapper) {
          return value;
        }
        if (hasOwnProperty.call(value, '__chain__') && hasOwnProperty.call(value, '__wrapped__')) {
          return wrapperClone(value);
        }
      }
      return new LodashWrapper(value);
    }

    /**
     * The function whose prototype all chaining wrappers inherit from.
     *
     * @private
     */
    function baseLodash() {
      // No operation performed.
    }

    /**
     * The base constructor for creating `lodash` wrapper objects.
     *
     * @private
     * @param {*} value The value to wrap.
     * @param {boolean} [chainAll] Enable chaining for all wrapper methods.
     * @param {Array} [actions=[]] Actions to peform to resolve the unwrapped value.
     */
    function LodashWrapper(value, chainAll, actions) {
      this.__wrapped__ = value;
      this.__actions__ = actions || [];
      this.__chain__ = !!chainAll;
    }

    /**
     * An object environment feature flags.
     *
     * @static
     * @memberOf _
     * @type Object
     */
    var support = lodash.support = {};

    (function(x) {
      var Ctor = function() { this.x = x; },
          object = { '0': x, 'length': x },
          props = [];

      Ctor.prototype = { 'valueOf': x, 'y': x };
      for (var key in new Ctor) { props.push(key); }

      /**
       * Detect if functions can be decompiled by `Function#toString`
       * (all but Firefox OS certified apps, older Opera mobile browsers, and
       * the PlayStation 3; forced `false` for Windows 8 apps).
       *
       * @memberOf _.support
       * @type boolean
       */
      support.funcDecomp = /\bthis\b/.test(function() { return this; });

      /**
       * Detect if `Function#name` is supported (all but IE).
       *
       * @memberOf _.support
       * @type boolean
       */
      support.funcNames = typeof Function.name == 'string';

      /**
       * Detect if the DOM is supported.
       *
       * @memberOf _.support
       * @type boolean
       */
      try {
        support.dom = document.createDocumentFragment().nodeType === 11;
      } catch(e) {
        support.dom = false;
      }

      /**
       * Detect if `arguments` object indexes are non-enumerable.
       *
       * In Firefox < 4, IE < 9, PhantomJS, and Safari < 5.1 `arguments` object
       * indexes are non-enumerable. Chrome < 25 and Node.js < 0.11.0 treat
       * `arguments` object indexes as non-enumerable and fail `hasOwnProperty`
       * checks for indexes that exceed the number of function parameters and
       * whose associated argument values are `0`.
       *
       * @memberOf _.support
       * @type boolean
       */
      try {
        support.nonEnumArgs = !propertyIsEnumerable.call(arguments, 1);
      } catch(e) {
        support.nonEnumArgs = true;
      }
    }(1, 0));

    /**
     * By default, the template delimiters used by lodash are like those in
     * embedded Ruby (ERB). Change the following template settings to use
     * alternative delimiters.
     *
     * @static
     * @memberOf _
     * @type Object
     */
    lodash.templateSettings = {

      /**
       * Used to detect `data` property values to be HTML-escaped.
       *
       * @memberOf _.templateSettings
       * @type RegExp
       */
      'escape': reEscape,

      /**
       * Used to detect code to be evaluated.
       *
       * @memberOf _.templateSettings
       * @type RegExp
       */
      'evaluate': reEvaluate,

      /**
       * Used to detect `data` property values to inject.
       *
       * @memberOf _.templateSettings
       * @type RegExp
       */
      'interpolate': reInterpolate,

      /**
       * Used to reference the data object in the template text.
       *
       * @memberOf _.templateSettings
       * @type string
       */
      'variable': '',

      /**
       * Used to import variables into the compiled template.
       *
       * @memberOf _.templateSettings
       * @type Object
       */
      'imports': {

        /**
         * A reference to the `lodash` function.
         *
         * @memberOf _.templateSettings.imports
         * @type Function
         */
        '_': lodash
      }
    };

    /*------------------------------------------------------------------------*/

    /**
     * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.
     *
     * @private
     * @param {*} value The value to wrap.
     */
    function LazyWrapper(value) {
      this.__wrapped__ = value;
      this.__actions__ = null;
      this.__dir__ = 1;
      this.__dropCount__ = 0;
      this.__filtered__ = false;
      this.__iteratees__ = null;
      this.__takeCount__ = POSITIVE_INFINITY;
      this.__views__ = null;
    }

    /**
     * Creates a clone of the lazy wrapper object.
     *
     * @private
     * @name clone
     * @memberOf LazyWrapper
     * @returns {Object} Returns the cloned `LazyWrapper` object.
     */
    function lazyClone() {
      var actions = this.__actions__,
          iteratees = this.__iteratees__,
          views = this.__views__,
          result = new LazyWrapper(this.__wrapped__);

      result.__actions__ = actions ? arrayCopy(actions) : null;
      result.__dir__ = this.__dir__;
      result.__filtered__ = this.__filtered__;
      result.__iteratees__ = iteratees ? arrayCopy(iteratees) : null;
      result.__takeCount__ = this.__takeCount__;
      result.__views__ = views ? arrayCopy(views) : null;
      return result;
    }

    /**
     * Reverses the direction of lazy iteration.
     *
     * @private
     * @name reverse
     * @memberOf LazyWrapper
     * @returns {Object} Returns the new reversed `LazyWrapper` object.
     */
    function lazyReverse() {
      if (this.__filtered__) {
        var result = new LazyWrapper(this);
        result.__dir__ = -1;
        result.__filtered__ = true;
      } else {
        result = this.clone();
        result.__dir__ *= -1;
      }
      return result;
    }

    /**
     * Extracts the unwrapped value from its lazy wrapper.
     *
     * @private
     * @name value
     * @memberOf LazyWrapper
     * @returns {*} Returns the unwrapped value.
     */
    function lazyValue() {
      var array = this.__wrapped__.value();
      if (!isArray(array)) {
        return baseWrapperValue(array, this.__actions__);
      }
      var dir = this.__dir__,
          isRight = dir < 0,
          view = getView(0, array.length, this.__views__),
          start = view.start,
          end = view.end,
          length = end - start,
          index = isRight ? end : (start - 1),
          takeCount = nativeMin(length, this.__takeCount__),
          iteratees = this.__iteratees__,
          iterLength = iteratees ? iteratees.length : 0,
          resIndex = 0,
          result = [];

      outer:
      while (length-- && resIndex < takeCount) {
        index += dir;

        var iterIndex = -1,
            value = array[index];

        while (++iterIndex < iterLength) {
          var data = iteratees[iterIndex],
              iteratee = data.iteratee,
              type = data.type;

          if (type == LAZY_DROP_WHILE_FLAG) {
            if (data.done && (isRight ? (index > data.index) : (index < data.index))) {
              data.count = 0;
              data.done = false;
            }
            data.index = index;
            if (!data.done) {
              var limit = data.limit;
              if (!(data.done = limit > -1 ? (data.count++ >= limit) : !iteratee(value))) {
                continue outer;
              }
            }
          } else {
            var computed = iteratee(value);
            if (type == LAZY_MAP_FLAG) {
              value = computed;
            } else if (!computed) {
              if (type == LAZY_FILTER_FLAG) {
                continue outer;
              } else {
                break outer;
              }
            }
          }
        }
        result[resIndex++] = value;
      }
      return result;
    }

    /*------------------------------------------------------------------------*/

    /**
     * Creates a cache object to store key/value pairs.
     *
     * @private
     * @static
     * @name Cache
     * @memberOf _.memoize
     */
    function MapCache() {
      this.__data__ = {};
    }

    /**
     * Removes `key` and its value from the cache.
     *
     * @private
     * @name delete
     * @memberOf _.memoize.Cache
     * @param {string} key The key of the value to remove.
     * @returns {boolean} Returns `true` if the entry was removed successfully, else `false`.
     */
    function mapDelete(key) {
      return this.has(key) && delete this.__data__[key];
    }

    /**
     * Gets the cached value for `key`.
     *
     * @private
     * @name get
     * @memberOf _.memoize.Cache
     * @param {string} key The key of the value to get.
     * @returns {*} Returns the cached value.
     */
    function mapGet(key) {
      return key == '__proto__' ? undefined : this.__data__[key];
    }

    /**
     * Checks if a cached value for `key` exists.
     *
     * @private
     * @name has
     * @memberOf _.memoize.Cache
     * @param {string} key The key of the entry to check.
     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
     */
    function mapHas(key) {
      return key != '__proto__' && hasOwnProperty.call(this.__data__, key);
    }

    /**
     * Sets `value` to `key` of the cache.
     *
     * @private
     * @name set
     * @memberOf _.memoize.Cache
     * @param {string} key The key of the value to cache.
     * @param {*} value The value to cache.
     * @returns {Object} Returns the cache object.
     */
    function mapSet(key, value) {
      if (key != '__proto__') {
        this.__data__[key] = value;
      }
      return this;
    }

    /*------------------------------------------------------------------------*/

    /**
     *
     * Creates a cache object to store unique values.
     *
     * @private
     * @param {Array} [values] The values to cache.
     */
    function SetCache(values) {
      var length = values ? values.length : 0;

      this.data = { 'hash': nativeCreate(null), 'set': new Set };
      while (length--) {
        this.push(values[length]);
      }
    }

    /**
     * Checks if `value` is in `cache` mimicking the return signature of
     * `_.indexOf` by returning `0` if the value is found, else `-1`.
     *
     * @private
     * @param {Object} cache The cache to search.
     * @param {*} value The value to search for.
     * @returns {number} Returns `0` if `value` is found, else `-1`.
     */
    function cacheIndexOf(cache, value) {
      var data = cache.data,
          result = (typeof value == 'string' || isObject(value)) ? data.set.has(value) : data.hash[value];

      return result ? 0 : -1;
    }

    /**
     * Adds `value` to the cache.
     *
     * @private
     * @name push
     * @memberOf SetCache
     * @param {*} value The value to cache.
     */
    function cachePush(value) {
      var data = this.data;
      if (typeof value == 'string' || isObject(value)) {
        data.set.add(value);
      } else {
        data.hash[value] = true;
      }
    }

    /*------------------------------------------------------------------------*/

    /**
     * Copies the values of `source` to `array`.
     *
     * @private
     * @param {Array} source The array to copy values from.
     * @param {Array} [array=[]] The array to copy values to.
     * @returns {Array} Returns `array`.
     */
    function arrayCopy(source, array) {
      var index = -1,
          length = source.length;

      array || (array = Array(length));
      while (++index < length) {
        array[index] = source[index];
      }
      return array;
    }

    /**
     * A specialized version of `_.forEach` for arrays without support for callback
     * shorthands and `this` binding.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array} Returns `array`.
     */
    function arrayEach(array, iteratee) {
      var index = -1,
          length = array.length;

      while (++index < length) {
        if (iteratee(array[index], index, array) === false) {
          break;
        }
      }
      return array;
    }

    /**
     * A specialized version of `_.forEachRight` for arrays without support for
     * callback shorthands and `this` binding.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array} Returns `array`.
     */
    function arrayEachRight(array, iteratee) {
      var length = array.length;

      while (length--) {
        if (iteratee(array[length], length, array) === false) {
          break;
        }
      }
      return array;
    }

    /**
     * A specialized version of `_.every` for arrays without support for callback
     * shorthands and `this` binding.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {boolean} Returns `true` if all elements pass the predicate check,
     *  else `false`.
     */
    function arrayEvery(array, predicate) {
      var index = -1,
          length = array.length;

      while (++index < length) {
        if (!predicate(array[index], index, array)) {
          return false;
        }
      }
      return true;
    }

    /**
     * A specialized version of `_.filter` for arrays without support for callback
     * shorthands and `this` binding.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {Array} Returns the new filtered array.
     */
    function arrayFilter(array, predicate) {
      var index = -1,
          length = array.length,
          resIndex = -1,
          result = [];

      while (++index < length) {
        var value = array[index];
        if (predicate(value, index, array)) {
          result[++resIndex] = value;
        }
      }
      return result;
    }

    /**
     * A specialized version of `_.map` for arrays without support for callback
     * shorthands and `this` binding.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array} Returns the new mapped array.
     */
    function arrayMap(array, iteratee) {
      var index = -1,
          length = array.length,
          result = Array(length);

      while (++index < length) {
        result[index] = iteratee(array[index], index, array);
      }
      return result;
    }

    /**
     * A specialized version of `_.max` for arrays without support for iteratees.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @returns {*} Returns the maximum value.
     */
    function arrayMax(array) {
      var index = -1,
          length = array.length,
          result = NEGATIVE_INFINITY;

      while (++index < length) {
        var value = array[index];
        if (value > result) {
          result = value;
        }
      }
      return result;
    }

    /**
     * A specialized version of `_.min` for arrays without support for iteratees.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @returns {*} Returns the minimum value.
     */
    function arrayMin(array) {
      var index = -1,
          length = array.length,
          result = POSITIVE_INFINITY;

      while (++index < length) {
        var value = array[index];
        if (value < result) {
          result = value;
        }
      }
      return result;
    }

    /**
     * A specialized version of `_.reduce` for arrays without support for callback
     * shorthands and `this` binding.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {*} [accumulator] The initial value.
     * @param {boolean} [initFromArray] Specify using the first element of `array`
     *  as the initial value.
     * @returns {*} Returns the accumulated value.
     */
    function arrayReduce(array, iteratee, accumulator, initFromArray) {
      var index = -1,
          length = array.length;

      if (initFromArray && length) {
        accumulator = array[++index];
      }
      while (++index < length) {
        accumulator = iteratee(accumulator, array[index], index, array);
      }
      return accumulator;
    }

    /**
     * A specialized version of `_.reduceRight` for arrays without support for
     * callback shorthands and `this` binding.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {*} [accumulator] The initial value.
     * @param {boolean} [initFromArray] Specify using the last element of `array`
     *  as the initial value.
     * @returns {*} Returns the accumulated value.
     */
    function arrayReduceRight(array, iteratee, accumulator, initFromArray) {
      var length = array.length;
      if (initFromArray && length) {
        accumulator = array[--length];
      }
      while (length--) {
        accumulator = iteratee(accumulator, array[length], length, array);
      }
      return accumulator;
    }

    /**
     * A specialized version of `_.some` for arrays without support for callback
     * shorthands and `this` binding.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {boolean} Returns `true` if any element passes the predicate check,
     *  else `false`.
     */
    function arraySome(array, predicate) {
      var index = -1,
          length = array.length;

      while (++index < length) {
        if (predicate(array[index], index, array)) {
          return true;
        }
      }
      return false;
    }

    /**
     * A specialized version of `_.sum` for arrays without support for iteratees.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @returns {number} Returns the sum.
     */
    function arraySum(array) {
      var length = array.length,
          result = 0;

      while (length--) {
        result += +array[length] || 0;
      }
      return result;
    }

    /**
     * Used by `_.defaults` to customize its `_.assign` use.
     *
     * @private
     * @param {*} objectValue The destination object property value.
     * @param {*} sourceValue The source object property value.
     * @returns {*} Returns the value to assign to the destination object.
     */
    function assignDefaults(objectValue, sourceValue) {
      return objectValue === undefined ? sourceValue : objectValue;
    }

    /**
     * Used by `_.template` to customize its `_.assign` use.
     *
     * **Note:** This function is like `assignDefaults` except that it ignores
     * inherited property values when checking if a property is `undefined`.
     *
     * @private
     * @param {*} objectValue The destination object property value.
     * @param {*} sourceValue The source object property value.
     * @param {string} key The key associated with the object and source values.
     * @param {Object} object The destination object.
     * @returns {*} Returns the value to assign to the destination object.
     */
    function assignOwnDefaults(objectValue, sourceValue, key, object) {
      return (objectValue === undefined || !hasOwnProperty.call(object, key))
        ? sourceValue
        : objectValue;
    }

    /**
     * A specialized version of `_.assign` for customizing assigned values without
     * support for argument juggling, multiple sources, and `this` binding `customizer`
     * functions.
     *
     * @private
     * @param {Object} object The destination object.
     * @param {Object} source The source object.
     * @param {Function} customizer The function to customize assigned values.
     * @returns {Object} Returns `object`.
     */
    function assignWith(object, source, customizer) {
      var props = keys(source);
      push.apply(props, getSymbols(source));

      var index = -1,
          length = props.length;

      while (++index < length) {
        var key = props[index],
            value = object[key],
            result = customizer(value, source[key], key, object, source);

        if ((result === result ? (result !== value) : (value === value)) ||
            (value === undefined && !(key in object))) {
          object[key] = result;
        }
      }
      return object;
    }

    /**
     * The base implementation of `_.assign` without support for argument juggling,
     * multiple sources, and `customizer` functions.
     *
     * @private
     * @param {Object} object The destination object.
     * @param {Object} source The source object.
     * @returns {Object} Returns `object`.
     */
    var baseAssign = nativeAssign || function(object, source) {
      return source == null
        ? object
        : baseCopy(source, getSymbols(source), baseCopy(source, keys(source), object));
    };

    /**
     * The base implementation of `_.at` without support for string collections
     * and individual key arguments.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {number[]|string[]} props The property names or indexes of elements to pick.
     * @returns {Array} Returns the new array of picked elements.
     */
    function baseAt(collection, props) {
      var index = -1,
          length = collection.length,
          isArr = isLength(length),
          propsLength = props.length,
          result = Array(propsLength);

      while(++index < propsLength) {
        var key = props[index];
        if (isArr) {
          result[index] = isIndex(key, length) ? collection[key] : undefined;
        } else {
          result[index] = collection[key];
        }
      }
      return result;
    }

    /**
     * Copies properties of `source` to `object`.
     *
     * @private
     * @param {Object} source The object to copy properties from.
     * @param {Array} props The property names to copy.
     * @param {Object} [object={}] The object to copy properties to.
     * @returns {Object} Returns `object`.
     */
    function baseCopy(source, props, object) {
      object || (object = {});

      var index = -1,
          length = props.length;

      while (++index < length) {
        var key = props[index];
        object[key] = source[key];
      }
      return object;
    }

    /**
     * The base implementation of `_.callback` which supports specifying the
     * number of arguments to provide to `func`.
     *
     * @private
     * @param {*} [func=_.identity] The value to convert to a callback.
     * @param {*} [thisArg] The `this` binding of `func`.
     * @param {number} [argCount] The number of arguments to provide to `func`.
     * @returns {Function} Returns the callback.
     */
    function baseCallback(func, thisArg, argCount) {
      var type = typeof func;
      if (type == 'function') {
        return thisArg === undefined
          ? func
          : bindCallback(func, thisArg, argCount);
      }
      if (func == null) {
        return identity;
      }
      if (type == 'object') {
        return baseMatches(func);
      }
      return thisArg === undefined
        ? property(func)
        : baseMatchesProperty(func, thisArg);
    }

    /**
     * The base implementation of `_.clone` without support for argument juggling
     * and `this` binding `customizer` functions.
     *
     * @private
     * @param {*} value The value to clone.
     * @param {boolean} [isDeep] Specify a deep clone.
     * @param {Function} [customizer] The function to customize cloning values.
     * @param {string} [key] The key of `value`.
     * @param {Object} [object] The object `value` belongs to.
     * @param {Array} [stackA=[]] Tracks traversed source objects.
     * @param {Array} [stackB=[]] Associates clones with source counterparts.
     * @returns {*} Returns the cloned value.
     */
    function baseClone(value, isDeep, customizer, key, object, stackA, stackB) {
      var result;
      if (customizer) {
        result = object ? customizer(value, key, object) : customizer(value);
      }
      if (result !== undefined) {
        return result;
      }
      if (!isObject(value)) {
        return value;
      }
      var isArr = isArray(value);
      if (isArr) {
        result = initCloneArray(value);
        if (!isDeep) {
          return arrayCopy(value, result);
        }
      } else {
        var tag = objToString.call(value),
            isFunc = tag == funcTag;

        if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
          result = initCloneObject(isFunc ? {} : value);
          if (!isDeep) {
            return baseAssign(result, value);
          }
        } else {
          return cloneableTags[tag]
            ? initCloneByTag(value, tag, isDeep)
            : (object ? value : {});
        }
      }
      // Check for circular references and return corresponding clone.
      stackA || (stackA = []);
      stackB || (stackB = []);

      var length = stackA.length;
      while (length--) {
        if (stackA[length] == value) {
          return stackB[length];
        }
      }
      // Add the source value to the stack of traversed objects and associate it with its clone.
      stackA.push(value);
      stackB.push(result);

      // Recursively populate clone (susceptible to call stack limits).
      (isArr ? arrayEach : baseForOwn)(value, function(subValue, key) {
        result[key] = baseClone(subValue, isDeep, customizer, key, value, stackA, stackB);
      });
      return result;
    }

    /**
     * The base implementation of `_.create` without support for assigning
     * properties to the created object.
     *
     * @private
     * @param {Object} prototype The object to inherit from.
     * @returns {Object} Returns the new object.
     */
    var baseCreate = (function() {
      function Object() {}
      return function(prototype) {
        if (isObject(prototype)) {
          Object.prototype = prototype;
          var result = new Object;
          Object.prototype = null;
        }
        return result || context.Object();
      };
    }());

    /**
     * The base implementation of `_.delay` and `_.defer` which accepts an index
     * of where to slice the arguments to provide to `func`.
     *
     * @private
     * @param {Function} func The function to delay.
     * @param {number} wait The number of milliseconds to delay invocation.
     * @param {Object} args The arguments provide to `func`.
     * @returns {number} Returns the timer id.
     */
    function baseDelay(func, wait, args) {
      if (typeof func != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      return setTimeout(function() { func.apply(undefined, args); }, wait);
    }

    /**
     * The base implementation of `_.difference` which accepts a single array
     * of values to exclude.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {Array} values The values to exclude.
     * @returns {Array} Returns the new array of filtered values.
     */
    function baseDifference(array, values) {
      var length = array ? array.length : 0,
          result = [];

      if (!length) {
        return result;
      }
      var index = -1,
          indexOf = getIndexOf(),
          isCommon = indexOf == baseIndexOf,
          cache = (isCommon && values.length >= 200) ? createCache(values) : null,
          valuesLength = values.length;

      if (cache) {
        indexOf = cacheIndexOf;
        isCommon = false;
        values = cache;
      }
      outer:
      while (++index < length) {
        var value = array[index];

        if (isCommon && value === value) {
          var valuesIndex = valuesLength;
          while (valuesIndex--) {
            if (values[valuesIndex] === value) {
              continue outer;
            }
          }
          result.push(value);
        }
        else if (indexOf(values, value, 0) < 0) {
          result.push(value);
        }
      }
      return result;
    }

    /**
     * The base implementation of `_.forEach` without support for callback
     * shorthands and `this` binding.
     *
     * @private
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array|Object|string} Returns `collection`.
     */
    var baseEach = createBaseEach(baseForOwn);

    /**
     * The base implementation of `_.forEachRight` without support for callback
     * shorthands and `this` binding.
     *
     * @private
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array|Object|string} Returns `collection`.
     */
    var baseEachRight = createBaseEach(baseForOwnRight, true);

    /**
     * The base implementation of `_.every` without support for callback
     * shorthands and `this` binding.
     *
     * @private
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {boolean} Returns `true` if all elements pass the predicate check,
     *  else `false`
     */
    function baseEvery(collection, predicate) {
      var result = true;
      baseEach(collection, function(value, index, collection) {
        result = !!predicate(value, index, collection);
        return result;
      });
      return result;
    }

    /**
     * The base implementation of `_.fill` without an iteratee call guard.
     *
     * @private
     * @param {Array} array The array to fill.
     * @param {*} value The value to fill `array` with.
     * @param {number} [start=0] The start position.
     * @param {number} [end=array.length] The end position.
     * @returns {Array} Returns `array`.
     */
    function baseFill(array, value, start, end) {
      var length = array.length;

      start = start == null ? 0 : (+start || 0);
      if (start < 0) {
        start = -start > length ? 0 : (length + start);
      }
      end = (end === undefined || end > length) ? length : (+end || 0);
      if (end < 0) {
        end += length;
      }
      length = start > end ? 0 : (end >>> 0);
      start >>>= 0;

      while (start < length) {
        array[start++] = value;
      }
      return array;
    }

    /**
     * The base implementation of `_.filter` without support for callback
     * shorthands and `this` binding.
     *
     * @private
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {Array} Returns the new filtered array.
     */
    function baseFilter(collection, predicate) {
      var result = [];
      baseEach(collection, function(value, index, collection) {
        if (predicate(value, index, collection)) {
          result.push(value);
        }
      });
      return result;
    }

    /**
     * The base implementation of `_.find`, `_.findLast`, `_.findKey`, and `_.findLastKey`,
     * without support for callback shorthands and `this` binding, which iterates
     * over `collection` using the provided `eachFunc`.
     *
     * @private
     * @param {Array|Object|string} collection The collection to search.
     * @param {Function} predicate The function invoked per iteration.
     * @param {Function} eachFunc The function to iterate over `collection`.
     * @param {boolean} [retKey] Specify returning the key of the found element
     *  instead of the element itself.
     * @returns {*} Returns the found element or its key, else `undefined`.
     */
    function baseFind(collection, predicate, eachFunc, retKey) {
      var result;
      eachFunc(collection, function(value, key, collection) {
        if (predicate(value, key, collection)) {
          result = retKey ? key : value;
          return false;
        }
      });
      return result;
    }

    /**
     * The base implementation of `_.flatten` with added support for restricting
     * flattening and specifying the start index.
     *
     * @private
     * @param {Array} array The array to flatten.
     * @param {boolean} isDeep Specify a deep flatten.
     * @param {boolean} isStrict Restrict flattening to arrays and `arguments` objects.
     * @returns {Array} Returns the new flattened array.
     */
    function baseFlatten(array, isDeep, isStrict) {
      var index = -1,
          length = array.length,
          resIndex = -1,
          result = [];

      while (++index < length) {
        var value = array[index];

        if (isObjectLike(value) && isLength(value.length) && (isArray(value) || isArguments(value))) {
          if (isDeep) {
            // Recursively flatten arrays (susceptible to call stack limits).
            value = baseFlatten(value, isDeep, isStrict);
          }
          var valIndex = -1,
              valLength = value.length;

          result.length += valLength;
          while (++valIndex < valLength) {
            result[++resIndex] = value[valIndex];
          }
        } else if (!isStrict) {
          result[++resIndex] = value;
        }
      }
      return result;
    }

    /**
     * The base implementation of `baseForIn` and `baseForOwn` which iterates
     * over `object` properties returned by `keysFunc` invoking `iteratee` for
     * each property. Iteratee functions may exit iteration early by explicitly
     * returning `false`.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {Function} keysFunc The function to get the keys of `object`.
     * @returns {Object} Returns `object`.
     */
    var baseFor = createBaseFor();

    /**
     * This function is like `baseFor` except that it iterates over properties
     * in the opposite order.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {Function} keysFunc The function to get the keys of `object`.
     * @returns {Object} Returns `object`.
     */
    var baseForRight = createBaseFor(true);

    /**
     * The base implementation of `_.forIn` without support for callback
     * shorthands and `this` binding.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Object} Returns `object`.
     */
    function baseForIn(object, iteratee) {
      return baseFor(object, iteratee, keysIn);
    }

    /**
     * The base implementation of `_.forOwn` without support for callback
     * shorthands and `this` binding.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Object} Returns `object`.
     */
    function baseForOwn(object, iteratee) {
      return baseFor(object, iteratee, keys);
    }

    /**
     * The base implementation of `_.forOwnRight` without support for callback
     * shorthands and `this` binding.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Object} Returns `object`.
     */
    function baseForOwnRight(object, iteratee) {
      return baseForRight(object, iteratee, keys);
    }

    /**
     * The base implementation of `_.functions` which creates an array of
     * `object` function property names filtered from those provided.
     *
     * @private
     * @param {Object} object The object to inspect.
     * @param {Array} props The property names to filter.
     * @returns {Array} Returns the new array of filtered property names.
     */
    function baseFunctions(object, props) {
      var index = -1,
          length = props.length,
          resIndex = -1,
          result = [];

      while (++index < length) {
        var key = props[index];
        if (isFunction(object[key])) {
          result[++resIndex] = key;
        }
      }
      return result;
    }

    /**
     * The base implementation of `get` without support for string paths
     * and default values.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Array} path The path of the property to get.
     * @param {string} [pathKey] The key representation of path.
     * @returns {*} Returns the resolved value.
     */
    function baseGet(object, path, pathKey) {
      if (object == null) {
        return;
      }
      if (pathKey !== undefined && pathKey in toObject(object)) {
        path = [pathKey];
      }
      var index = -1,
          length = path.length;

      while (object != null && ++index < length) {
        var result = object = object[path[index]];
      }
      return result;
    }

    /**
     * The base implementation of `_.isEqual` without support for `this` binding
     * `customizer` functions.
     *
     * @private
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @param {Function} [customizer] The function to customize comparing values.
     * @param {boolean} [isLoose] Specify performing partial comparisons.
     * @param {Array} [stackA] Tracks traversed `value` objects.
     * @param {Array} [stackB] Tracks traversed `other` objects.
     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
     */
    function baseIsEqual(value, other, customizer, isLoose, stackA, stackB) {
      // Exit early for identical values.
      if (value === other) {
        // Treat `+0` vs. `-0` as not equal.
        return value !== 0 || (1 / value == 1 / other);
      }
      var valType = typeof value,
          othType = typeof other;

      // Exit early for unlike primitive values.
      if ((valType != 'function' && valType != 'object' && othType != 'function' && othType != 'object') ||
          value == null || other == null) {
        // Return `false` unless both values are `NaN`.
        return value !== value && other !== other;
      }
      return baseIsEqualDeep(value, other, baseIsEqual, customizer, isLoose, stackA, stackB);
    }

    /**
     * A specialized version of `baseIsEqual` for arrays and objects which performs
     * deep comparisons and tracks traversed objects enabling objects with circular
     * references to be compared.
     *
     * @private
     * @param {Object} object The object to compare.
     * @param {Object} other The other object to compare.
     * @param {Function} equalFunc The function to determine equivalents of values.
     * @param {Function} [customizer] The function to customize comparing objects.
     * @param {boolean} [isLoose] Specify performing partial comparisons.
     * @param {Array} [stackA=[]] Tracks traversed `value` objects.
     * @param {Array} [stackB=[]] Tracks traversed `other` objects.
     * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
     */
    function baseIsEqualDeep(object, other, equalFunc, customizer, isLoose, stackA, stackB) {
      var objIsArr = isArray(object),
          othIsArr = isArray(other),
          objTag = arrayTag,
          othTag = arrayTag;

      if (!objIsArr) {
        objTag = objToString.call(object);
        if (objTag == argsTag) {
          objTag = objectTag;
        } else if (objTag != objectTag) {
          objIsArr = isTypedArray(object);
        }
      }
      if (!othIsArr) {
        othTag = objToString.call(other);
        if (othTag == argsTag) {
          othTag = objectTag;
        } else if (othTag != objectTag) {
          othIsArr = isTypedArray(other);
        }
      }
      var objIsObj = objTag == objectTag,
          othIsObj = othTag == objectTag,
          isSameTag = objTag == othTag;

      if (isSameTag && !(objIsArr || objIsObj)) {
        return equalByTag(object, other, objTag);
      }
      if (!isLoose) {
        var valWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
            othWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');

        if (valWrapped || othWrapped) {
          return equalFunc(valWrapped ? object.value() : object, othWrapped ? other.value() : other, customizer, isLoose, stackA, stackB);
        }
      }
      if (!isSameTag) {
        return false;
      }
      // Assume cyclic values are equal.
      // For more information on detecting circular references see https://es5.github.io/#JO.
      stackA || (stackA = []);
      stackB || (stackB = []);

      var length = stackA.length;
      while (length--) {
        if (stackA[length] == object) {
          return stackB[length] == other;
        }
      }
      // Add `object` and `other` to the stack of traversed objects.
      stackA.push(object);
      stackB.push(other);

      var result = (objIsArr ? equalArrays : equalObjects)(object, other, equalFunc, customizer, isLoose, stackA, stackB);

      stackA.pop();
      stackB.pop();

      return result;
    }

    /**
     * The base implementation of `_.isMatch` without support for callback
     * shorthands and `this` binding.
     *
     * @private
     * @param {Object} object The object to inspect.
     * @param {Array} props The source property names to match.
     * @param {Array} values The source values to match.
     * @param {Array} strictCompareFlags Strict comparison flags for source values.
     * @param {Function} [customizer] The function to customize comparing objects.
     * @returns {boolean} Returns `true` if `object` is a match, else `false`.
     */
    function baseIsMatch(object, props, values, strictCompareFlags, customizer) {
      var index = -1,
          length = props.length,
          noCustomizer = !customizer;

      while (++index < length) {
        if ((noCustomizer && strictCompareFlags[index])
              ? values[index] !== object[props[index]]
              : !(props[index] in object)
            ) {
          return false;
        }
      }
      index = -1;
      while (++index < length) {
        var key = props[index],
            objValue = object[key],
            srcValue = values[index];

        if (noCustomizer && strictCompareFlags[index]) {
          var result = objValue !== undefined || (key in object);
        } else {
          result = customizer ? customizer(objValue, srcValue, key) : undefined;
          if (result === undefined) {
            result = baseIsEqual(srcValue, objValue, customizer, true);
          }
        }
        if (!result) {
          return false;
        }
      }
      return true;
    }

    /**
     * The base implementation of `_.map` without support for callback shorthands
     * and `this` binding.
     *
     * @private
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array} Returns the new mapped array.
     */
    function baseMap(collection, iteratee) {
      var index = -1,
          length = getLength(collection),
          result = isLength(length) ? Array(length) : [];

      baseEach(collection, function(value, key, collection) {
        result[++index] = iteratee(value, key, collection);
      });
      return result;
    }

    /**
     * The base implementation of `_.matches` which does not clone `source`.
     *
     * @private
     * @param {Object} source The object of property values to match.
     * @returns {Function} Returns the new function.
     */
    function baseMatches(source) {
      var props = keys(source),
          length = props.length;

      if (!length) {
        return constant(true);
      }
      if (length == 1) {
        var key = props[0],
            value = source[key];

        if (isStrictComparable(value)) {
          return function(object) {
            if (object == null) {
              return false;
            }
            return object[key] === value && (value !== undefined || (key in toObject(object)));
          };
        }
      }
      var values = Array(length),
          strictCompareFlags = Array(length);

      while (length--) {
        value = source[props[length]];
        values[length] = value;
        strictCompareFlags[length] = isStrictComparable(value);
      }
      return function(object) {
        return object != null && baseIsMatch(toObject(object), props, values, strictCompareFlags);
      };
    }

    /**
     * The base implementation of `_.matchesProperty` which does not which does
     * not clone `value`.
     *
     * @private
     * @param {string} path The path of the property to get.
     * @param {*} value The value to compare.
     * @returns {Function} Returns the new function.
     */
    function baseMatchesProperty(path, value) {
      var isArr = isArray(path),
          isCommon = isKey(path) && isStrictComparable(value),
          pathKey = (path + '');

      path = toPath(path);
      return function(object) {
        if (object == null) {
          return false;
        }
        var key = pathKey;
        object = toObject(object);
        if ((isArr || !isCommon) && !(key in object)) {
          object = path.length == 1 ? object : baseGet(object, baseSlice(path, 0, -1));
          if (object == null) {
            return false;
          }
          key = last(path);
          object = toObject(object);
        }
        return object[key] === value
          ? (value !== undefined || (key in object))
          : baseIsEqual(value, object[key], null, true);
      };
    }

    /**
     * The base implementation of `_.merge` without support for argument juggling,
     * multiple sources, and `this` binding `customizer` functions.
     *
     * @private
     * @param {Object} object The destination object.
     * @param {Object} source The source object.
     * @param {Function} [customizer] The function to customize merging properties.
     * @param {Array} [stackA=[]] Tracks traversed source objects.
     * @param {Array} [stackB=[]] Associates values with source counterparts.
     * @returns {Object} Returns `object`.
     */
    function baseMerge(object, source, customizer, stackA, stackB) {
      if (!isObject(object)) {
        return object;
      }
      var isSrcArr = isLength(source.length) && (isArray(source) || isTypedArray(source));
      if (!isSrcArr) {
        var props = keys(source);
        push.apply(props, getSymbols(source));
      }
      arrayEach(props || source, function(srcValue, key) {
        if (props) {
          key = srcValue;
          srcValue = source[key];
        }
        if (isObjectLike(srcValue)) {
          stackA || (stackA = []);
          stackB || (stackB = []);
          baseMergeDeep(object, source, key, baseMerge, customizer, stackA, stackB);
        }
        else {
          var value = object[key],
              result = customizer ? customizer(value, srcValue, key, object, source) : undefined,
              isCommon = result === undefined;

          if (isCommon) {
            result = srcValue;
          }
          if ((isSrcArr || result !== undefined) &&
              (isCommon || (result === result ? (result !== value) : (value === value)))) {
            object[key] = result;
          }
        }
      });
      return object;
    }

    /**
     * A specialized version of `baseMerge` for arrays and objects which performs
     * deep merges and tracks traversed objects enabling objects with circular
     * references to be merged.
     *
     * @private
     * @param {Object} object The destination object.
     * @param {Object} source The source object.
     * @param {string} key The key of the value to merge.
     * @param {Function} mergeFunc The function to merge values.
     * @param {Function} [customizer] The function to customize merging properties.
     * @param {Array} [stackA=[]] Tracks traversed source objects.
     * @param {Array} [stackB=[]] Associates values with source counterparts.
     * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
     */
    function baseMergeDeep(object, source, key, mergeFunc, customizer, stackA, stackB) {
      var length = stackA.length,
          srcValue = source[key];

      while (length--) {
        if (stackA[length] == srcValue) {
          object[key] = stackB[length];
          return;
        }
      }
      var value = object[key],
          result = customizer ? customizer(value, srcValue, key, object, source) : undefined,
          isCommon = result === undefined;

      if (isCommon) {
        result = srcValue;
        if (isLength(srcValue.length) && (isArray(srcValue) || isTypedArray(srcValue))) {
          result = isArray(value)
            ? value
            : (getLength(value) ? arrayCopy(value) : []);
        }
        else if (isPlainObject(srcValue) || isArguments(srcValue)) {
          result = isArguments(value)
            ? toPlainObject(value)
            : (isPlainObject(value) ? value : {});
        }
        else {
          isCommon = false;
        }
      }
      // Add the source value to the stack of traversed objects and associate
      // it with its merged value.
      stackA.push(srcValue);
      stackB.push(result);

      if (isCommon) {
        // Recursively merge objects and arrays (susceptible to call stack limits).
        object[key] = mergeFunc(result, srcValue, customizer, stackA, stackB);
      } else if (result === result ? (result !== value) : (value === value)) {
        object[key] = result;
      }
    }

    /**
     * The base implementation of `_.property` without support for deep paths.
     *
     * @private
     * @param {string} key The key of the property to get.
     * @returns {Function} Returns the new function.
     */
    function baseProperty(key) {
      return function(object) {
        return object == null ? undefined : object[key];
      };
    }

    /**
     * A specialized version of `baseProperty` which supports deep paths.
     *
     * @private
     * @param {Array|string} path The path of the property to get.
     * @returns {Function} Returns the new function.
     */
    function basePropertyDeep(path) {
      var pathKey = (path + '');
      path = toPath(path);
      return function(object) {
        return baseGet(object, path, pathKey);
      };
    }

    /**
     * The base implementation of `_.pullAt` without support for individual
     * index arguments and capturing the removed elements.
     *
     * @private
     * @param {Array} array The array to modify.
     * @param {number[]} indexes The indexes of elements to remove.
     * @returns {Array} Returns `array`.
     */
    function basePullAt(array, indexes) {
      var length = indexes.length;
      while (length--) {
        var index = parseFloat(indexes[length]);
        if (index != previous && isIndex(index)) {
          var previous = index;
          splice.call(array, index, 1);
        }
      }
      return array;
    }

    /**
     * The base implementation of `_.random` without support for argument juggling
     * and returning floating-point numbers.
     *
     * @private
     * @param {number} min The minimum possible value.
     * @param {number} max The maximum possible value.
     * @returns {number} Returns the random number.
     */
    function baseRandom(min, max) {
      return min + floor(nativeRandom() * (max - min + 1));
    }

    /**
     * The base implementation of `_.reduce` and `_.reduceRight` without support
     * for callback shorthands and `this` binding, which iterates over `collection`
     * using the provided `eachFunc`.
     *
     * @private
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {*} accumulator The initial value.
     * @param {boolean} initFromCollection Specify using the first or last element
     *  of `collection` as the initial value.
     * @param {Function} eachFunc The function to iterate over `collection`.
     * @returns {*} Returns the accumulated value.
     */
    function baseReduce(collection, iteratee, accumulator, initFromCollection, eachFunc) {
      eachFunc(collection, function(value, index, collection) {
        accumulator = initFromCollection
          ? (initFromCollection = false, value)
          : iteratee(accumulator, value, index, collection);
      });
      return accumulator;
    }

    /**
     * The base implementation of `setData` without support for hot loop detection.
     *
     * @private
     * @param {Function} func The function to associate metadata with.
     * @param {*} data The metadata.
     * @returns {Function} Returns `func`.
     */
    var baseSetData = !metaMap ? identity : function(func, data) {
      metaMap.set(func, data);
      return func;
    };

    /**
     * The base implementation of `_.slice` without an iteratee call guard.
     *
     * @private
     * @param {Array} array The array to slice.
     * @param {number} [start=0] The start position.
     * @param {number} [end=array.length] The end position.
     * @returns {Array} Returns the slice of `array`.
     */
    function baseSlice(array, start, end) {
      var index = -1,
          length = array.length;

      start = start == null ? 0 : (+start || 0);
      if (start < 0) {
        start = -start > length ? 0 : (length + start);
      }
      end = (end === undefined || end > length) ? length : (+end || 0);
      if (end < 0) {
        end += length;
      }
      length = start > end ? 0 : ((end - start) >>> 0);
      start >>>= 0;

      var result = Array(length);
      while (++index < length) {
        result[index] = array[index + start];
      }
      return result;
    }

    /**
     * The base implementation of `_.some` without support for callback shorthands
     * and `this` binding.
     *
     * @private
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {boolean} Returns `true` if any element passes the predicate check,
     *  else `false`.
     */
    function baseSome(collection, predicate) {
      var result;

      baseEach(collection, function(value, index, collection) {
        result = predicate(value, index, collection);
        return !result;
      });
      return !!result;
    }

    /**
     * The base implementation of `_.sortBy` which uses `comparer` to define
     * the sort order of `array` and replaces criteria objects with their
     * corresponding values.
     *
     * @private
     * @param {Array} array The array to sort.
     * @param {Function} comparer The function to define sort order.
     * @returns {Array} Returns `array`.
     */
    function baseSortBy(array, comparer) {
      var length = array.length;

      array.sort(comparer);
      while (length--) {
        array[length] = array[length].value;
      }
      return array;
    }

    /**
     * The base implementation of `_.sortByOrder` without param guards.
     *
     * @private
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.
     * @param {boolean[]} orders The sort orders of `iteratees`.
     * @returns {Array} Returns the new sorted array.
     */
    function baseSortByOrder(collection, iteratees, orders) {
      var callback = getCallback(),
          index = -1;

      iteratees = arrayMap(iteratees, function(iteratee) { return callback(iteratee); });

      var result = baseMap(collection, function(value) {
        var criteria = arrayMap(iteratees, function(iteratee) { return iteratee(value); });
        return { 'criteria': criteria, 'index': ++index, 'value': value };
      });

      return baseSortBy(result, function(object, other) {
        return compareMultiple(object, other, orders);
      });
    }

    /**
     * The base implementation of `_.sum` without support for callback shorthands
     * and `this` binding.
     *
     * @private
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {number} Returns the sum.
     */
    function baseSum(collection, iteratee) {
      var result = 0;
      baseEach(collection, function(value, index, collection) {
        result += +iteratee(value, index, collection) || 0;
      });
      return result;
    }

    /**
     * The base implementation of `_.uniq` without support for callback shorthands
     * and `this` binding.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {Function} [iteratee] The function invoked per iteration.
     * @returns {Array} Returns the new duplicate-value-free array.
     */
    function baseUniq(array, iteratee) {
      var index = -1,
          indexOf = getIndexOf(),
          length = array.length,
          isCommon = indexOf == baseIndexOf,
          isLarge = isCommon && length >= 200,
          seen = isLarge ? createCache() : null,
          result = [];

      if (seen) {
        indexOf = cacheIndexOf;
        isCommon = false;
      } else {
        isLarge = false;
        seen = iteratee ? [] : result;
      }
      outer:
      while (++index < length) {
        var value = array[index],
            computed = iteratee ? iteratee(value, index, array) : value;

        if (isCommon && value === value) {
          var seenIndex = seen.length;
          while (seenIndex--) {
            if (seen[seenIndex] === computed) {
              continue outer;
            }
          }
          if (iteratee) {
            seen.push(computed);
          }
          result.push(value);
        }
        else if (indexOf(seen, computed, 0) < 0) {
          if (iteratee || isLarge) {
            seen.push(computed);
          }
          result.push(value);
        }
      }
      return result;
    }

    /**
     * The base implementation of `_.values` and `_.valuesIn` which creates an
     * array of `object` property values corresponding to the property names
     * of `props`.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Array} props The property names to get values for.
     * @returns {Object} Returns the array of property values.
     */
    function baseValues(object, props) {
      var index = -1,
          length = props.length,
          result = Array(length);

      while (++index < length) {
        result[index] = object[props[index]];
      }
      return result;
    }

    /**
     * The base implementation of `_.dropRightWhile`, `_.dropWhile`, `_.takeRightWhile`,
     * and `_.takeWhile` without support for callback shorthands and `this` binding.
     *
     * @private
     * @param {Array} array The array to query.
     * @param {Function} predicate The function invoked per iteration.
     * @param {boolean} [isDrop] Specify dropping elements instead of taking them.
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Array} Returns the slice of `array`.
     */
    function baseWhile(array, predicate, isDrop, fromRight) {
      var length = array.length,
          index = fromRight ? length : -1;

      while ((fromRight ? index-- : ++index < length) && predicate(array[index], index, array)) {}
      return isDrop
        ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
        : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
    }

    /**
     * The base implementation of `wrapperValue` which returns the result of
     * performing a sequence of actions on the unwrapped `value`, where each
     * successive action is supplied the return value of the previous.
     *
     * @private
     * @param {*} value The unwrapped value.
     * @param {Array} actions Actions to peform to resolve the unwrapped value.
     * @returns {*} Returns the resolved value.
     */
    function baseWrapperValue(value, actions) {
      var result = value;
      if (result instanceof LazyWrapper) {
        result = result.value();
      }
      var index = -1,
          length = actions.length;

      while (++index < length) {
        var args = [result],
            action = actions[index];

        push.apply(args, action.args);
        result = action.func.apply(action.thisArg, args);
      }
      return result;
    }

    /**
     * Performs a binary search of `array` to determine the index at which `value`
     * should be inserted into `array` in order to maintain its sort order.
     *
     * @private
     * @param {Array} array The sorted array to inspect.
     * @param {*} value The value to evaluate.
     * @param {boolean} [retHighest] Specify returning the highest qualified index.
     * @returns {number} Returns the index at which `value` should be inserted
     *  into `array`.
     */
    function binaryIndex(array, value, retHighest) {
      var low = 0,
          high = array ? array.length : low;

      if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {
        while (low < high) {
          var mid = (low + high) >>> 1,
              computed = array[mid];

          if (retHighest ? (computed <= value) : (computed < value)) {
            low = mid + 1;
          } else {
            high = mid;
          }
        }
        return high;
      }
      return binaryIndexBy(array, value, identity, retHighest);
    }

    /**
     * This function is like `binaryIndex` except that it invokes `iteratee` for
     * `value` and each element of `array` to compute their sort ranking. The
     * iteratee is invoked with one argument; (value).
     *
     * @private
     * @param {Array} array The sorted array to inspect.
     * @param {*} value The value to evaluate.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {boolean} [retHighest] Specify returning the highest qualified index.
     * @returns {number} Returns the index at which `value` should be inserted
     *  into `array`.
     */
    function binaryIndexBy(array, value, iteratee, retHighest) {
      value = iteratee(value);

      var low = 0,
          high = array ? array.length : 0,
          valIsNaN = value !== value,
          valIsUndef = value === undefined;

      while (low < high) {
        var mid = floor((low + high) / 2),
            computed = iteratee(array[mid]),
            isReflexive = computed === computed;

        if (valIsNaN) {
          var setLow = isReflexive || retHighest;
        } else if (valIsUndef) {
          setLow = isReflexive && (retHighest || computed !== undefined);
        } else {
          setLow = retHighest ? (computed <= value) : (computed < value);
        }
        if (setLow) {
          low = mid + 1;
        } else {
          high = mid;
        }
      }
      return nativeMin(high, MAX_ARRAY_INDEX);
    }

    /**
     * A specialized version of `baseCallback` which only supports `this` binding
     * and specifying the number of arguments to provide to `func`.
     *
     * @private
     * @param {Function} func The function to bind.
     * @param {*} thisArg The `this` binding of `func`.
     * @param {number} [argCount] The number of arguments to provide to `func`.
     * @returns {Function} Returns the callback.
     */
    function bindCallback(func, thisArg, argCount) {
      if (typeof func != 'function') {
        return identity;
      }
      if (thisArg === undefined) {
        return func;
      }
      switch (argCount) {
        case 1: return function(value) {
          return func.call(thisArg, value);
        };
        case 3: return function(value, index, collection) {
          return func.call(thisArg, value, index, collection);
        };
        case 4: return function(accumulator, value, index, collection) {
          return func.call(thisArg, accumulator, value, index, collection);
        };
        case 5: return function(value, other, key, object, source) {
          return func.call(thisArg, value, other, key, object, source);
        };
      }
      return function() {
        return func.apply(thisArg, arguments);
      };
    }

    /**
     * Creates a clone of the given array buffer.
     *
     * @private
     * @param {ArrayBuffer} buffer The array buffer to clone.
     * @returns {ArrayBuffer} Returns the cloned array buffer.
     */
    function bufferClone(buffer) {
      return bufferSlice.call(buffer, 0);
    }
    if (!bufferSlice) {
      // PhantomJS has `ArrayBuffer` and `Uint8Array` but not `Float64Array`.
      bufferClone = !(ArrayBuffer && Uint8Array) ? constant(null) : function(buffer) {
        var byteLength = buffer.byteLength,
            floatLength = Float64Array ? floor(byteLength / FLOAT64_BYTES_PER_ELEMENT) : 0,
            offset = floatLength * FLOAT64_BYTES_PER_ELEMENT,
            result = new ArrayBuffer(byteLength);

        if (floatLength) {
          var view = new Float64Array(result, 0, floatLength);
          view.set(new Float64Array(buffer, 0, floatLength));
        }
        if (byteLength != offset) {
          view = new Uint8Array(result, offset);
          view.set(new Uint8Array(buffer, offset));
        }
        return result;
      };
    }

    /**
     * Creates an array that is the composition of partially applied arguments,
     * placeholders, and provided arguments into a single array of arguments.
     *
     * @private
     * @param {Array|Object} args The provided arguments.
     * @param {Array} partials The arguments to prepend to those provided.
     * @param {Array} holders The `partials` placeholder indexes.
     * @returns {Array} Returns the new array of composed arguments.
     */
    function composeArgs(args, partials, holders) {
      var holdersLength = holders.length,
          argsIndex = -1,
          argsLength = nativeMax(args.length - holdersLength, 0),
          leftIndex = -1,
          leftLength = partials.length,
          result = Array(argsLength + leftLength);

      while (++leftIndex < leftLength) {
        result[leftIndex] = partials[leftIndex];
      }
      while (++argsIndex < holdersLength) {
        result[holders[argsIndex]] = args[argsIndex];
      }
      while (argsLength--) {
        result[leftIndex++] = args[argsIndex++];
      }
      return result;
    }

    /**
     * This function is like `composeArgs` except that the arguments composition
     * is tailored for `_.partialRight`.
     *
     * @private
     * @param {Array|Object} args The provided arguments.
     * @param {Array} partials The arguments to append to those provided.
     * @param {Array} holders The `partials` placeholder indexes.
     * @returns {Array} Returns the new array of composed arguments.
     */
    function composeArgsRight(args, partials, holders) {
      var holdersIndex = -1,
          holdersLength = holders.length,
          argsIndex = -1,
          argsLength = nativeMax(args.length - holdersLength, 0),
          rightIndex = -1,
          rightLength = partials.length,
          result = Array(argsLength + rightLength);

      while (++argsIndex < argsLength) {
        result[argsIndex] = args[argsIndex];
      }
      var pad = argsIndex;
      while (++rightIndex < rightLength) {
        result[pad + rightIndex] = partials[rightIndex];
      }
      while (++holdersIndex < holdersLength) {
        result[pad + holders[holdersIndex]] = args[argsIndex++];
      }
      return result;
    }

    /**
     * Creates a function that aggregates a collection, creating an accumulator
     * object composed from the results of running each element in the collection
     * through an iteratee.
     *
     * **Note:** This function is used to create `_.countBy`, `_.groupBy`, `_.indexBy`,
     * and `_.partition`.
     *
     * @private
     * @param {Function} setter The function to set keys and values of the accumulator object.
     * @param {Function} [initializer] The function to initialize the accumulator object.
     * @returns {Function} Returns the new aggregator function.
     */
    function createAggregator(setter, initializer) {
      return function(collection, iteratee, thisArg) {
        var result = initializer ? initializer() : {};
        iteratee = getCallback(iteratee, thisArg, 3);

        if (isArray(collection)) {
          var index = -1,
              length = collection.length;

          while (++index < length) {
            var value = collection[index];
            setter(result, value, iteratee(value, index, collection), collection);
          }
        } else {
          baseEach(collection, function(value, key, collection) {
            setter(result, value, iteratee(value, key, collection), collection);
          });
        }
        return result;
      };
    }

    /**
     * Creates a function that assigns properties of source object(s) to a given
     * destination object.
     *
     * **Note:** This function is used to create `_.assign`, `_.defaults`, and `_.merge`.
     *
     * @private
     * @param {Function} assigner The function to assign values.
     * @returns {Function} Returns the new assigner function.
     */
    function createAssigner(assigner) {
      return restParam(function(object, sources) {
        var index = -1,
            length = object == null ? 0 : sources.length,
            customizer = length > 2 && sources[length - 2],
            guard = length > 2 && sources[2],
            thisArg = length > 1 && sources[length - 1];

        if (typeof customizer == 'function') {
          customizer = bindCallback(customizer, thisArg, 5);
          length -= 2;
        } else {
          customizer = typeof thisArg == 'function' ? thisArg : null;
          length -= (customizer ? 1 : 0);
        }
        if (guard && isIterateeCall(sources[0], sources[1], guard)) {
          customizer = length < 3 ? null : customizer;
          length = 1;
        }
        while (++index < length) {
          var source = sources[index];
          if (source) {
            assigner(object, source, customizer);
          }
        }
        return object;
      });
    }

    /**
     * Creates a `baseEach` or `baseEachRight` function.
     *
     * @private
     * @param {Function} eachFunc The function to iterate over a collection.
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Function} Returns the new base function.
     */
    function createBaseEach(eachFunc, fromRight) {
      return function(collection, iteratee) {
        var length = collection ? getLength(collection) : 0;
        if (!isLength(length)) {
          return eachFunc(collection, iteratee);
        }
        var index = fromRight ? length : -1,
            iterable = toObject(collection);

        while ((fromRight ? index-- : ++index < length)) {
          if (iteratee(iterable[index], index, iterable) === false) {
            break;
          }
        }
        return collection;
      };
    }

    /**
     * Creates a base function for `_.forIn` or `_.forInRight`.
     *
     * @private
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Function} Returns the new base function.
     */
    function createBaseFor(fromRight) {
      return function(object, iteratee, keysFunc) {
        var iterable = toObject(object),
            props = keysFunc(object),
            length = props.length,
            index = fromRight ? length : -1;

        while ((fromRight ? index-- : ++index < length)) {
          var key = props[index];
          if (iteratee(iterable[key], key, iterable) === false) {
            break;
          }
        }
        return object;
      };
    }

    /**
     * Creates a function that wraps `func` and invokes it with the `this`
     * binding of `thisArg`.
     *
     * @private
     * @param {Function} func The function to bind.
     * @param {*} [thisArg] The `this` binding of `func`.
     * @returns {Function} Returns the new bound function.
     */
    function createBindWrapper(func, thisArg) {
      var Ctor = createCtorWrapper(func);

      function wrapper() {
        var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
        return fn.apply(thisArg, arguments);
      }
      return wrapper;
    }

    /**
     * Creates a `Set` cache object to optimize linear searches of large arrays.
     *
     * @private
     * @param {Array} [values] The values to cache.
     * @returns {null|Object} Returns the new cache object if `Set` is supported, else `null`.
     */
    var createCache = !(nativeCreate && Set) ? constant(null) : function(values) {
      return new SetCache(values);
    };

    /**
     * Creates a function that produces compound words out of the words in a
     * given string.
     *
     * @private
     * @param {Function} callback The function to combine each word.
     * @returns {Function} Returns the new compounder function.
     */
    function createCompounder(callback) {
      return function(string) {
        var index = -1,
            array = words(deburr(string)),
            length = array.length,
            result = '';

        while (++index < length) {
          result = callback(result, array[index], index);
        }
        return result;
      };
    }

    /**
     * Creates a function that produces an instance of `Ctor` regardless of
     * whether it was invoked as part of a `new` expression or by `call` or `apply`.
     *
     * @private
     * @param {Function} Ctor The constructor to wrap.
     * @returns {Function} Returns the new wrapped function.
     */
    function createCtorWrapper(Ctor) {
      return function() {
        var thisBinding = baseCreate(Ctor.prototype),
            result = Ctor.apply(thisBinding, arguments);

        // Mimic the constructor's `return` behavior.
        // See https://es5.github.io/#x13.2.2 for more details.
        return isObject(result) ? result : thisBinding;
      };
    }

    /**
     * Creates a `_.curry` or `_.curryRight` function.
     *
     * @private
     * @param {boolean} flag The curry bit flag.
     * @returns {Function} Returns the new curry function.
     */
    function createCurry(flag) {
      function curryFunc(func, arity, guard) {
        if (guard && isIterateeCall(func, arity, guard)) {
          arity = null;
        }
        var result = createWrapper(func, flag, null, null, null, null, null, arity);
        result.placeholder = curryFunc.placeholder;
        return result;
      }
      return curryFunc;
    }

    /**
     * Creates a `_.max` or `_.min` function.
     *
     * @private
     * @param {Function} arrayFunc The function to get the extremum value from an array.
     * @param {boolean} [isMin] Specify returning the minimum, instead of the maximum,
     *  extremum value.
     * @returns {Function} Returns the new extremum function.
     */
    function createExtremum(arrayFunc, isMin) {
      return function(collection, iteratee, thisArg) {
        if (thisArg && isIterateeCall(collection, iteratee, thisArg)) {
          iteratee = null;
        }
        var func = getCallback(),
            noIteratee = iteratee == null;

        if (!(func === baseCallback && noIteratee)) {
          noIteratee = false;
          iteratee = func(iteratee, thisArg, 3);
        }
        if (noIteratee) {
          var isArr = isArray(collection);
          if (!isArr && isString(collection)) {
            iteratee = charAtCallback;
          } else {
            return arrayFunc(isArr ? collection : toIterable(collection));
          }
        }
        return extremumBy(collection, iteratee, isMin);
      };
    }

    /**
     * Creates a `_.find` or `_.findLast` function.
     *
     * @private
     * @param {Function} eachFunc The function to iterate over a collection.
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Function} Returns the new find function.
     */
    function createFind(eachFunc, fromRight) {
      return function(collection, predicate, thisArg) {
        predicate = getCallback(predicate, thisArg, 3);
        if (isArray(collection)) {
          var index = baseFindIndex(collection, predicate, fromRight);
          return index > -1 ? collection[index] : undefined;
        }
        return baseFind(collection, predicate, eachFunc);
      }
    }

    /**
     * Creates a `_.findIndex` or `_.findLastIndex` function.
     *
     * @private
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Function} Returns the new find function.
     */
    function createFindIndex(fromRight) {
      return function(array, predicate, thisArg) {
        if (!(array && array.length)) {
          return -1;
        }
        predicate = getCallback(predicate, thisArg, 3);
        return baseFindIndex(array, predicate, fromRight);
      };
    }

    /**
     * Creates a `_.findKey` or `_.findLastKey` function.
     *
     * @private
     * @param {Function} objectFunc The function to iterate over an object.
     * @returns {Function} Returns the new find function.
     */
    function createFindKey(objectFunc) {
      return function(object, predicate, thisArg) {
        predicate = getCallback(predicate, thisArg, 3);
        return baseFind(object, predicate, objectFunc, true);
      };
    }

    /**
     * Creates a `_.flow` or `_.flowRight` function.
     *
     * @private
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Function} Returns the new flow function.
     */
    function createFlow(fromRight) {
      return function() {
        var length = arguments.length;
        if (!length) {
          return function() { return arguments[0]; };
        }
        var wrapper,
            index = fromRight ? length : -1,
            leftIndex = 0,
            funcs = Array(length);

        while ((fromRight ? index-- : ++index < length)) {
          var func = funcs[leftIndex++] = arguments[index];
          if (typeof func != 'function') {
            throw new TypeError(FUNC_ERROR_TEXT);
          }
          var funcName = wrapper ? '' : getFuncName(func);
          wrapper = funcName == 'wrapper' ? new LodashWrapper([]) : wrapper;
        }
        index = wrapper ? -1 : length;
        while (++index < length) {
          func = funcs[index];
          funcName = getFuncName(func);

          var data = funcName == 'wrapper' ? getData(func) : null;
          if (data && isLaziable(data[0])) {
            wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
          } else {
            wrapper = (func.length == 1 && isLaziable(func)) ? wrapper[funcName]() : wrapper.thru(func);
          }
        }
        return function() {
          var args = arguments;
          if (wrapper && args.length == 1 && isArray(args[0])) {
            return wrapper.plant(args[0]).value();
          }
          var index = 0,
              result = funcs[index].apply(this, args);

          while (++index < length) {
            result = funcs[index].call(this, result);
          }
          return result;
        };
      };
    }

    /**
     * Creates a function for `_.forEach` or `_.forEachRight`.
     *
     * @private
     * @param {Function} arrayFunc The function to iterate over an array.
     * @param {Function} eachFunc The function to iterate over a collection.
     * @returns {Function} Returns the new each function.
     */
    function createForEach(arrayFunc, eachFunc) {
      return function(collection, iteratee, thisArg) {
        return (typeof iteratee == 'function' && thisArg === undefined && isArray(collection))
          ? arrayFunc(collection, iteratee)
          : eachFunc(collection, bindCallback(iteratee, thisArg, 3));
      };
    }

    /**
     * Creates a function for `_.forIn` or `_.forInRight`.
     *
     * @private
     * @param {Function} objectFunc The function to iterate over an object.
     * @returns {Function} Returns the new each function.
     */
    function createForIn(objectFunc) {
      return function(object, iteratee, thisArg) {
        if (typeof iteratee != 'function' || thisArg !== undefined) {
          iteratee = bindCallback(iteratee, thisArg, 3);
        }
        return objectFunc(object, iteratee, keysIn);
      };
    }

    /**
     * Creates a function for `_.forOwn` or `_.forOwnRight`.
     *
     * @private
     * @param {Function} objectFunc The function to iterate over an object.
     * @returns {Function} Returns the new each function.
     */
    function createForOwn(objectFunc) {
      return function(object, iteratee, thisArg) {
        if (typeof iteratee != 'function' || thisArg !== undefined) {
          iteratee = bindCallback(iteratee, thisArg, 3);
        }
        return objectFunc(object, iteratee);
      };
    }

    /**
     * Creates a function for `_.padLeft` or `_.padRight`.
     *
     * @private
     * @param {boolean} [fromRight] Specify padding from the right.
     * @returns {Function} Returns the new pad function.
     */
    function createPadDir(fromRight) {
      return function(string, length, chars) {
        string = baseToString(string);
        return string && ((fromRight ? string : '') + createPadding(string, length, chars) + (fromRight ? '' : string));
      };
    }

    /**
     * Creates a `_.partial` or `_.partialRight` function.
     *
     * @private
     * @param {boolean} flag The partial bit flag.
     * @returns {Function} Returns the new partial function.
     */
    function createPartial(flag) {
      var partialFunc = restParam(function(func, partials) {
        var holders = replaceHolders(partials, partialFunc.placeholder);
        return createWrapper(func, flag, null, partials, holders);
      });
      return partialFunc;
    }

    /**
     * Creates a function for `_.reduce` or `_.reduceRight`.
     *
     * @private
     * @param {Function} arrayFunc The function to iterate over an array.
     * @param {Function} eachFunc The function to iterate over a collection.
     * @returns {Function} Returns the new each function.
     */
    function createReduce(arrayFunc, eachFunc) {
      return function(collection, iteratee, accumulator, thisArg) {
        var initFromArray = arguments.length < 3;
        return (typeof iteratee == 'function' && thisArg === undefined && isArray(collection))
          ? arrayFunc(collection, iteratee, accumulator, initFromArray)
          : baseReduce(collection, getCallback(iteratee, thisArg, 4), accumulator, initFromArray, eachFunc);
      };
    }

    /**
     * Creates a function that wraps `func` and invokes it with optional `this`
     * binding of, partial application, and currying.
     *
     * @private
     * @param {Function|string} func The function or method name to reference.
     * @param {number} bitmask The bitmask of flags. See `createWrapper` for more details.
     * @param {*} [thisArg] The `this` binding of `func`.
     * @param {Array} [partials] The arguments to prepend to those provided to the new function.
     * @param {Array} [holders] The `partials` placeholder indexes.
     * @param {Array} [partialsRight] The arguments to append to those provided to the new function.
     * @param {Array} [holdersRight] The `partialsRight` placeholder indexes.
     * @param {Array} [argPos] The argument positions of the new function.
     * @param {number} [ary] The arity cap of `func`.
     * @param {number} [arity] The arity of `func`.
     * @returns {Function} Returns the new wrapped function.
     */
    function createHybridWrapper(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
      var isAry = bitmask & ARY_FLAG,
          isBind = bitmask & BIND_FLAG,
          isBindKey = bitmask & BIND_KEY_FLAG,
          isCurry = bitmask & CURRY_FLAG,
          isCurryBound = bitmask & CURRY_BOUND_FLAG,
          isCurryRight = bitmask & CURRY_RIGHT_FLAG;

      var Ctor = !isBindKey && createCtorWrapper(func),
          key = func;

      function wrapper() {
        // Avoid `arguments` object use disqualifying optimizations by
        // converting it to an array before providing it to other functions.
        var length = arguments.length,
            index = length,
            args = Array(length);

        while (index--) {
          args[index] = arguments[index];
        }
        if (partials) {
          args = composeArgs(args, partials, holders);
        }
        if (partialsRight) {
          args = composeArgsRight(args, partialsRight, holdersRight);
        }
        if (isCurry || isCurryRight) {
          var placeholder = wrapper.placeholder,
              argsHolders = replaceHolders(args, placeholder);

          length -= argsHolders.length;
          if (length < arity) {
            var newArgPos = argPos ? arrayCopy(argPos) : null,
                newArity = nativeMax(arity - length, 0),
                newsHolders = isCurry ? argsHolders : null,
                newHoldersRight = isCurry ? null : argsHolders,
                newPartials = isCurry ? args : null,
                newPartialsRight = isCurry ? null : args;

            bitmask |= (isCurry ? PARTIAL_FLAG : PARTIAL_RIGHT_FLAG);
            bitmask &= ~(isCurry ? PARTIAL_RIGHT_FLAG : PARTIAL_FLAG);

            if (!isCurryBound) {
              bitmask &= ~(BIND_FLAG | BIND_KEY_FLAG);
            }
            var newData = [func, bitmask, thisArg, newPartials, newsHolders, newPartialsRight, newHoldersRight, newArgPos, ary, newArity],
                result = createHybridWrapper.apply(undefined, newData);

            if (isLaziable(func)) {
              setData(result, newData);
            }
            result.placeholder = placeholder;
            return result;
          }
        }
        var thisBinding = isBind ? thisArg : this;
        if (isBindKey) {
          func = thisBinding[key];
        }
        if (argPos) {
          args = reorder(args, argPos);
        }
        if (isAry && ary < args.length) {
          args.length = ary;
        }
        var fn = (this && this !== root && this instanceof wrapper) ? (Ctor || createCtorWrapper(func)) : func;
        return fn.apply(thisBinding, args);
      }
      return wrapper;
    }

    /**
     * Creates the padding required for `string` based on the given `length`.
     * The `chars` string is truncated if the number of characters exceeds `length`.
     *
     * @private
     * @param {string} string The string to create padding for.
     * @param {number} [length=0] The padding length.
     * @param {string} [chars=' '] The string used as padding.
     * @returns {string} Returns the pad for `string`.
     */
    function createPadding(string, length, chars) {
      var strLength = string.length;
      length = +length;

      if (strLength >= length || !nativeIsFinite(length)) {
        return '';
      }
      var padLength = length - strLength;
      chars = chars == null ? ' ' : (chars + '');
      return repeat(chars, ceil(padLength / chars.length)).slice(0, padLength);
    }

    /**
     * Creates a function that wraps `func` and invokes it with the optional `this`
     * binding of `thisArg` and the `partials` prepended to those provided to
     * the wrapper.
     *
     * @private
     * @param {Function} func The function to partially apply arguments to.
     * @param {number} bitmask The bitmask of flags. See `createWrapper` for more details.
     * @param {*} thisArg The `this` binding of `func`.
     * @param {Array} partials The arguments to prepend to those provided to the new function.
     * @returns {Function} Returns the new bound function.
     */
    function createPartialWrapper(func, bitmask, thisArg, partials) {
      var isBind = bitmask & BIND_FLAG,
          Ctor = createCtorWrapper(func);

      function wrapper() {
        // Avoid `arguments` object use disqualifying optimizations by
        // converting it to an array before providing it `func`.
        var argsIndex = -1,
            argsLength = arguments.length,
            leftIndex = -1,
            leftLength = partials.length,
            args = Array(argsLength + leftLength);

        while (++leftIndex < leftLength) {
          args[leftIndex] = partials[leftIndex];
        }
        while (argsLength--) {
          args[leftIndex++] = arguments[++argsIndex];
        }
        var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
        return fn.apply(isBind ? thisArg : this, args);
      }
      return wrapper;
    }

    /**
     * Creates a `_.sortedIndex` or `_.sortedLastIndex` function.
     *
     * @private
     * @param {boolean} [retHighest] Specify returning the highest qualified index.
     * @returns {Function} Returns the new index function.
     */
    function createSortedIndex(retHighest) {
      return function(array, value, iteratee, thisArg) {
        var func = getCallback(iteratee);
        return (func === baseCallback && iteratee == null)
          ? binaryIndex(array, value, retHighest)
          : binaryIndexBy(array, value, func(iteratee, thisArg, 1), retHighest);
      };
    }

    /**
     * Creates a function that either curries or invokes `func` with optional
     * `this` binding and partially applied arguments.
     *
     * @private
     * @param {Function|string} func The function or method name to reference.
     * @param {number} bitmask The bitmask of flags.
     *  The bitmask may be composed of the following flags:
     *     1 - `_.bind`
     *     2 - `_.bindKey`
     *     4 - `_.curry` or `_.curryRight` of a bound function
     *     8 - `_.curry`
     *    16 - `_.curryRight`
     *    32 - `_.partial`
     *    64 - `_.partialRight`
     *   128 - `_.rearg`
     *   256 - `_.ary`
     * @param {*} [thisArg] The `this` binding of `func`.
     * @param {Array} [partials] The arguments to be partially applied.
     * @param {Array} [holders] The `partials` placeholder indexes.
     * @param {Array} [argPos] The argument positions of the new function.
     * @param {number} [ary] The arity cap of `func`.
     * @param {number} [arity] The arity of `func`.
     * @returns {Function} Returns the new wrapped function.
     */
    function createWrapper(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
      var isBindKey = bitmask & BIND_KEY_FLAG;
      if (!isBindKey && typeof func != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      var length = partials ? partials.length : 0;
      if (!length) {
        bitmask &= ~(PARTIAL_FLAG | PARTIAL_RIGHT_FLAG);
        partials = holders = null;
      }
      length -= (holders ? holders.length : 0);
      if (bitmask & PARTIAL_RIGHT_FLAG) {
        var partialsRight = partials,
            holdersRight = holders;

        partials = holders = null;
      }
      var data = isBindKey ? null : getData(func),
          newData = [func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity];

      if (data) {
        mergeData(newData, data);
        bitmask = newData[1];
        arity = newData[9];
      }
      newData[9] = arity == null
        ? (isBindKey ? 0 : func.length)
        : (nativeMax(arity - length, 0) || 0);

      if (bitmask == BIND_FLAG) {
        var result = createBindWrapper(newData[0], newData[2]);
      } else if ((bitmask == PARTIAL_FLAG || bitmask == (BIND_FLAG | PARTIAL_FLAG)) && !newData[4].length) {
        result = createPartialWrapper.apply(undefined, newData);
      } else {
        result = createHybridWrapper.apply(undefined, newData);
      }
      var setter = data ? baseSetData : setData;
      return setter(result, newData);
    }

    /**
     * A specialized version of `baseIsEqualDeep` for arrays with support for
     * partial deep comparisons.
     *
     * @private
     * @param {Array} array The array to compare.
     * @param {Array} other The other array to compare.
     * @param {Function} equalFunc The function to determine equivalents of values.
     * @param {Function} [customizer] The function to customize comparing arrays.
     * @param {boolean} [isLoose] Specify performing partial comparisons.
     * @param {Array} [stackA] Tracks traversed `value` objects.
     * @param {Array} [stackB] Tracks traversed `other` objects.
     * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
     */
    function equalArrays(array, other, equalFunc, customizer, isLoose, stackA, stackB) {
      var index = -1,
          arrLength = array.length,
          othLength = other.length,
          result = true;

      if (arrLength != othLength && !(isLoose && othLength > arrLength)) {
        return false;
      }
      // Deep compare the contents, ignoring non-numeric properties.
      while (result && ++index < arrLength) {
        var arrValue = array[index],
            othValue = other[index];

        result = undefined;
        if (customizer) {
          result = isLoose
            ? customizer(othValue, arrValue, index)
            : customizer(arrValue, othValue, index);
        }
        if (result === undefined) {
          // Recursively compare arrays (susceptible to call stack limits).
          if (isLoose) {
            var othIndex = othLength;
            while (othIndex--) {
              othValue = other[othIndex];
              result = (arrValue && arrValue === othValue) || equalFunc(arrValue, othValue, customizer, isLoose, stackA, stackB);
              if (result) {
                break;
              }
            }
          } else {
            result = (arrValue && arrValue === othValue) || equalFunc(arrValue, othValue, customizer, isLoose, stackA, stackB);
          }
        }
      }
      return !!result;
    }

    /**
     * A specialized version of `baseIsEqualDeep` for comparing objects of
     * the same `toStringTag`.
     *
     * **Note:** This function only supports comparing values with tags of
     * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
     *
     * @private
     * @param {Object} value The object to compare.
     * @param {Object} other The other object to compare.
     * @param {string} tag The `toStringTag` of the objects to compare.
     * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
     */
    function equalByTag(object, other, tag) {
      switch (tag) {
        case boolTag:
        case dateTag:
          // Coerce dates and booleans to numbers, dates to milliseconds and booleans
          // to `1` or `0` treating invalid dates coerced to `NaN` as not equal.
          return +object == +other;

        case errorTag:
          return object.name == other.name && object.message == other.message;

        case numberTag:
          // Treat `NaN` vs. `NaN` as equal.
          return (object != +object)
            ? other != +other
            // But, treat `-0` vs. `+0` as not equal.
            : (object == 0 ? ((1 / object) == (1 / other)) : object == +other);

        case regexpTag:
        case stringTag:
          // Coerce regexes to strings and treat strings primitives and string
          // objects as equal. See https://es5.github.io/#x15.10.6.4 for more details.
          return object == (other + '');
      }
      return false;
    }

    /**
     * A specialized version of `baseIsEqualDeep` for objects with support for
     * partial deep comparisons.
     *
     * @private
     * @param {Object} object The object to compare.
     * @param {Object} other The other object to compare.
     * @param {Function} equalFunc The function to determine equivalents of values.
     * @param {Function} [customizer] The function to customize comparing values.
     * @param {boolean} [isLoose] Specify performing partial comparisons.
     * @param {Array} [stackA] Tracks traversed `value` objects.
     * @param {Array} [stackB] Tracks traversed `other` objects.
     * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
     */
    function equalObjects(object, other, equalFunc, customizer, isLoose, stackA, stackB) {
      var objProps = keys(object),
          objLength = objProps.length,
          othProps = keys(other),
          othLength = othProps.length;

      if (objLength != othLength && !isLoose) {
        return false;
      }
      var skipCtor = isLoose,
          index = -1;

      while (++index < objLength) {
        var key = objProps[index],
            result = isLoose ? key in other : hasOwnProperty.call(other, key);

        if (result) {
          var objValue = object[key],
              othValue = other[key];

          result = undefined;
          if (customizer) {
            result = isLoose
              ? customizer(othValue, objValue, key)
              : customizer(objValue, othValue, key);
          }
          if (result === undefined) {
            // Recursively compare objects (susceptible to call stack limits).
            result = (objValue && objValue === othValue) || equalFunc(objValue, othValue, customizer, isLoose, stackA, stackB);
          }
        }
        if (!result) {
          return false;
        }
        skipCtor || (skipCtor = key == 'constructor');
      }
      if (!skipCtor) {
        var objCtor = object.constructor,
            othCtor = other.constructor;

        // Non `Object` object instances with different constructors are not equal.
        if (objCtor != othCtor &&
            ('constructor' in object && 'constructor' in other) &&
            !(typeof objCtor == 'function' && objCtor instanceof objCtor &&
              typeof othCtor == 'function' && othCtor instanceof othCtor)) {
          return false;
        }
      }
      return true;
    }

    /**
     * Gets the extremum value of `collection` invoking `iteratee` for each value
     * in `collection` to generate the criterion by which the value is ranked.
     * The `iteratee` is invoked with three arguments: (value, index, collection).
     *
     * @private
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {boolean} [isMin] Specify returning the minimum, instead of the
     *  maximum, extremum value.
     * @returns {*} Returns the extremum value.
     */
    function extremumBy(collection, iteratee, isMin) {
      var exValue = isMin ? POSITIVE_INFINITY : NEGATIVE_INFINITY,
          computed = exValue,
          result = computed;

      baseEach(collection, function(value, index, collection) {
        var current = iteratee(value, index, collection);
        if ((isMin ? (current < computed) : (current > computed)) ||
            (current === exValue && current === result)) {
          computed = current;
          result = value;
        }
      });
      return result;
    }

    /**
     * Gets the appropriate "callback" function. If the `_.callback` method is
     * customized this function returns the custom method, otherwise it returns
     * the `baseCallback` function. If arguments are provided the chosen function
     * is invoked with them and its result is returned.
     *
     * @private
     * @returns {Function} Returns the chosen function or its result.
     */
    function getCallback(func, thisArg, argCount) {
      var result = lodash.callback || callback;
      result = result === callback ? baseCallback : result;
      return argCount ? result(func, thisArg, argCount) : result;
    }

    /**
     * Gets metadata for `func`.
     *
     * @private
     * @param {Function} func The function to query.
     * @returns {*} Returns the metadata for `func`.
     */
    var getData = !metaMap ? noop : function(func) {
      return metaMap.get(func);
    };

    /**
     * Gets the name of `func`.
     *
     * @private
     * @param {Function} func The function to query.
     * @returns {string} Returns the function name.
     */
    var getFuncName = (function() {
      if (!support.funcNames) {
        return constant('');
      }
      if (constant.name == 'constant') {
        return baseProperty('name');
      }
      return function(func) {
        var result = func.name,
            array = realNames[result],
            length = array ? array.length : 0;

        while (length--) {
          var data = array[length],
              otherFunc = data.func;

          if (otherFunc == null || otherFunc == func) {
            return data.name;
          }
        }
        return result;
      };
    }());

    /**
     * Gets the appropriate "indexOf" function. If the `_.indexOf` method is
     * customized this function returns the custom method, otherwise it returns
     * the `baseIndexOf` function. If arguments are provided the chosen function
     * is invoked with them and its result is returned.
     *
     * @private
     * @returns {Function|number} Returns the chosen function or its result.
     */
    function getIndexOf(collection, target, fromIndex) {
      var result = lodash.indexOf || indexOf;
      result = result === indexOf ? baseIndexOf : result;
      return collection ? result(collection, target, fromIndex) : result;
    }

    /**
     * Gets the "length" property value of `object`.
     *
     * **Note:** This function is used to avoid a [JIT bug](https://bugs.webkit.org/show_bug.cgi?id=142792)
     * in Safari on iOS 8.1 ARM64.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {*} Returns the "length" value.
     */
    var getLength = baseProperty('length');

    /**
     * Creates an array of the own symbols of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of symbols.
     */
    var getSymbols = !getOwnPropertySymbols ? constant([]) : function(object) {
      return getOwnPropertySymbols(toObject(object));
    };

    /**
     * Gets the view, applying any `transforms` to the `start` and `end` positions.
     *
     * @private
     * @param {number} start The start of the view.
     * @param {number} end The end of the view.
     * @param {Array} [transforms] The transformations to apply to the view.
     * @returns {Object} Returns an object containing the `start` and `end`
     *  positions of the view.
     */
    function getView(start, end, transforms) {
      var index = -1,
          length = transforms ? transforms.length : 0;

      while (++index < length) {
        var data = transforms[index],
            size = data.size;

        switch (data.type) {
          case 'drop':      start += size; break;
          case 'dropRight': end -= size; break;
          case 'take':      end = nativeMin(end, start + size); break;
          case 'takeRight': start = nativeMax(start, end - size); break;
        }
      }
      return { 'start': start, 'end': end };
    }

    /**
     * Initializes an array clone.
     *
     * @private
     * @param {Array} array The array to clone.
     * @returns {Array} Returns the initialized clone.
     */
    function initCloneArray(array) {
      var length = array.length,
          result = new array.constructor(length);

      // Add array properties assigned by `RegExp#exec`.
      if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
        result.index = array.index;
        result.input = array.input;
      }
      return result;
    }

    /**
     * Initializes an object clone.
     *
     * @private
     * @param {Object} object The object to clone.
     * @returns {Object} Returns the initialized clone.
     */
    function initCloneObject(object) {
      var Ctor = object.constructor;
      if (!(typeof Ctor == 'function' && Ctor instanceof Ctor)) {
        Ctor = Object;
      }
      return new Ctor;
    }

    /**
     * Initializes an object clone based on its `toStringTag`.
     *
     * **Note:** This function only supports cloning values with tags of
     * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
     *
     * @private
     * @param {Object} object The object to clone.
     * @param {string} tag The `toStringTag` of the object to clone.
     * @param {boolean} [isDeep] Specify a deep clone.
     * @returns {Object} Returns the initialized clone.
     */
    function initCloneByTag(object, tag, isDeep) {
      var Ctor = object.constructor;
      switch (tag) {
        case arrayBufferTag:
          return bufferClone(object);

        case boolTag:
        case dateTag:
          return new Ctor(+object);

        case float32Tag: case float64Tag:
        case int8Tag: case int16Tag: case int32Tag:
        case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
          var buffer = object.buffer;
          return new Ctor(isDeep ? bufferClone(buffer) : buffer, object.byteOffset, object.length);

        case numberTag:
        case stringTag:
          return new Ctor(object);

        case regexpTag:
          var result = new Ctor(object.source, reFlags.exec(object));
          result.lastIndex = object.lastIndex;
      }
      return result;
    }

    /**
     * Invokes the method at `path` on `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Array|string} path The path of the method to invoke.
     * @param {Array} args The arguments to invoke the method with.
     * @returns {*} Returns the result of the invoked method.
     */
    function invokePath(object, path, args) {
      if (object != null && !isKey(path, object)) {
        path = toPath(path);
        object = path.length == 1 ? object : baseGet(object, baseSlice(path, 0, -1));
        path = last(path);
      }
      var func = object == null ? object : object[path];
      return func == null ? undefined : func.apply(object, args);
    }

    /**
     * Checks if `value` is a valid array-like index.
     *
     * @private
     * @param {*} value The value to check.
     * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
     * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
     */
    function isIndex(value, length) {
      value = +value;
      length = length == null ? MAX_SAFE_INTEGER : length;
      return value > -1 && value % 1 == 0 && value < length;
    }

    /**
     * Checks if the provided arguments are from an iteratee call.
     *
     * @private
     * @param {*} value The potential iteratee value argument.
     * @param {*} index The potential iteratee index or key argument.
     * @param {*} object The potential iteratee object argument.
     * @returns {boolean} Returns `true` if the arguments are from an iteratee call, else `false`.
     */
    function isIterateeCall(value, index, object) {
      if (!isObject(object)) {
        return false;
      }
      var type = typeof index;
      if (type == 'number') {
        var length = getLength(object),
            prereq = isLength(length) && isIndex(index, length);
      } else {
        prereq = type == 'string' && index in object;
      }
      if (prereq) {
        var other = object[index];
        return value === value ? (value === other) : (other !== other);
      }
      return false;
    }

    /**
     * Checks if `value` is a property name and not a property path.
     *
     * @private
     * @param {*} value The value to check.
     * @param {Object} [object] The object to query keys on.
     * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
     */
    function isKey(value, object) {
      var type = typeof value;
      if ((type == 'string' && reIsPlainProp.test(value)) || type == 'number') {
        return true;
      }
      if (isArray(value)) {
        return false;
      }
      var result = !reIsDeepProp.test(value);
      return result || (object != null && value in toObject(object));
    }

    /**
     * Checks if `func` has a lazy counterpart.
     *
     * @private
     * @param {Function} func The function to check.
     * @returns {boolean} Returns `true` if `func` has a lazy counterpart, else `false`.
     */
    function isLaziable(func) {
      var funcName = getFuncName(func);
      return !!funcName && func === lodash[funcName] && funcName in LazyWrapper.prototype;
    }

    /**
     * Checks if `value` is a valid array-like length.
     *
     * **Note:** This function is based on [`ToLength`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength).
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
     */
    function isLength(value) {
      return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
    }

    /**
     * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` if suitable for strict
     *  equality comparisons, else `false`.
     */
    function isStrictComparable(value) {
      return value === value && (value === 0 ? ((1 / value) > 0) : !isObject(value));
    }

    /**
     * Merges the function metadata of `source` into `data`.
     *
     * Merging metadata reduces the number of wrappers required to invoke a function.
     * This is possible because methods like `_.bind`, `_.curry`, and `_.partial`
     * may be applied regardless of execution order. Methods like `_.ary` and `_.rearg`
     * augment function arguments, making the order in which they are executed important,
     * preventing the merging of metadata. However, we make an exception for a safe
     * common case where curried functions have `_.ary` and or `_.rearg` applied.
     *
     * @private
     * @param {Array} data The destination metadata.
     * @param {Array} source The source metadata.
     * @returns {Array} Returns `data`.
     */
    function mergeData(data, source) {
      var bitmask = data[1],
          srcBitmask = source[1],
          newBitmask = bitmask | srcBitmask,
          isCommon = newBitmask < ARY_FLAG;

      var isCombo =
        (srcBitmask == ARY_FLAG && bitmask == CURRY_FLAG) ||
        (srcBitmask == ARY_FLAG && bitmask == REARG_FLAG && data[7].length <= source[8]) ||
        (srcBitmask == (ARY_FLAG | REARG_FLAG) && bitmask == CURRY_FLAG);

      // Exit early if metadata can't be merged.
      if (!(isCommon || isCombo)) {
        return data;
      }
      // Use source `thisArg` if available.
      if (srcBitmask & BIND_FLAG) {
        data[2] = source[2];
        // Set when currying a bound function.
        newBitmask |= (bitmask & BIND_FLAG) ? 0 : CURRY_BOUND_FLAG;
      }
      // Compose partial arguments.
      var value = source[3];
      if (value) {
        var partials = data[3];
        data[3] = partials ? composeArgs(partials, value, source[4]) : arrayCopy(value);
        data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : arrayCopy(source[4]);
      }
      // Compose partial right arguments.
      value = source[5];
      if (value) {
        partials = data[5];
        data[5] = partials ? composeArgsRight(partials, value, source[6]) : arrayCopy(value);
        data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : arrayCopy(source[6]);
      }
      // Use source `argPos` if available.
      value = source[7];
      if (value) {
        data[7] = arrayCopy(value);
      }
      // Use source `ary` if it's smaller.
      if (srcBitmask & ARY_FLAG) {
        data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);
      }
      // Use source `arity` if one is not provided.
      if (data[9] == null) {
        data[9] = source[9];
      }
      // Use source `func` and merge bitmasks.
      data[0] = source[0];
      data[1] = newBitmask;

      return data;
    }

    /**
     * A specialized version of `_.pick` that picks `object` properties specified
     * by `props`.
     *
     * @private
     * @param {Object} object The source object.
     * @param {string[]} props The property names to pick.
     * @returns {Object} Returns the new object.
     */
    function pickByArray(object, props) {
      object = toObject(object);

      var index = -1,
          length = props.length,
          result = {};

      while (++index < length) {
        var key = props[index];
        if (key in object) {
          result[key] = object[key];
        }
      }
      return result;
    }

    /**
     * A specialized version of `_.pick` that picks `object` properties `predicate`
     * returns truthy for.
     *
     * @private
     * @param {Object} object The source object.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {Object} Returns the new object.
     */
    function pickByCallback(object, predicate) {
      var result = {};
      baseForIn(object, function(value, key, object) {
        if (predicate(value, key, object)) {
          result[key] = value;
        }
      });
      return result;
    }

    /**
     * Reorder `array` according to the specified indexes where the element at
     * the first index is assigned as the first element, the element at
     * the second index is assigned as the second element, and so on.
     *
     * @private
     * @param {Array} array The array to reorder.
     * @param {Array} indexes The arranged array indexes.
     * @returns {Array} Returns `array`.
     */
    function reorder(array, indexes) {
      var arrLength = array.length,
          length = nativeMin(indexes.length, arrLength),
          oldArray = arrayCopy(array);

      while (length--) {
        var index = indexes[length];
        array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined;
      }
      return array;
    }

    /**
     * Sets metadata for `func`.
     *
     * **Note:** If this function becomes hot, i.e. is invoked a lot in a short
     * period of time, it will trip its breaker and transition to an identity function
     * to avoid garbage collection pauses in V8. See [V8 issue 2070](https://code.google.com/p/v8/issues/detail?id=2070)
     * for more details.
     *
     * @private
     * @param {Function} func The function to associate metadata with.
     * @param {*} data The metadata.
     * @returns {Function} Returns `func`.
     */
    var setData = (function() {
      var count = 0,
          lastCalled = 0;

      return function(key, value) {
        var stamp = now(),
            remaining = HOT_SPAN - (stamp - lastCalled);

        lastCalled = stamp;
        if (remaining > 0) {
          if (++count >= HOT_COUNT) {
            return key;
          }
        } else {
          count = 0;
        }
        return baseSetData(key, value);
      };
    }());

    /**
     * A fallback implementation of `_.isPlainObject` which checks if `value`
     * is an object created by the `Object` constructor or has a `[[Prototype]]`
     * of `null`.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
     */
    function shimIsPlainObject(value) {
      var Ctor,
          support = lodash.support;

      // Exit early for non `Object` objects.
      if (!(isObjectLike(value) && objToString.call(value) == objectTag) ||
          (!hasOwnProperty.call(value, 'constructor') &&
            (Ctor = value.constructor, typeof Ctor == 'function' && !(Ctor instanceof Ctor)))) {
        return false;
      }
      // IE < 9 iterates inherited properties before own properties. If the first
      // iterated property is an object's own property then there are no inherited
      // enumerable properties.
      var result;
      // In most environments an object's own properties are iterated before
      // its inherited properties. If the last iterated property is an object's
      // own property then there are no inherited enumerable properties.
      baseForIn(value, function(subValue, key) {
        result = key;
      });
      return result === undefined || hasOwnProperty.call(value, result);
    }

    /**
     * A fallback implementation of `Object.keys` which creates an array of the
     * own enumerable property names of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names.
     */
    function shimKeys(object) {
      var props = keysIn(object),
          propsLength = props.length,
          length = propsLength && object.length,
          support = lodash.support;

      var allowIndexes = length && isLength(length) &&
        (isArray(object) || (support.nonEnumArgs && isArguments(object)));

      var index = -1,
          result = [];

      while (++index < propsLength) {
        var key = props[index];
        if ((allowIndexes && isIndex(key, length)) || hasOwnProperty.call(object, key)) {
          result.push(key);
        }
      }
      return result;
    }

    /**
     * Converts `value` to an array-like object if it is not one.
     *
     * @private
     * @param {*} value The value to process.
     * @returns {Array|Object} Returns the array-like object.
     */
    function toIterable(value) {
      if (value == null) {
        return [];
      }
      if (!isLength(getLength(value))) {
        return values(value);
      }
      return isObject(value) ? value : Object(value);
    }

    /**
     * Converts `value` to an object if it is not one.
     *
     * @private
     * @param {*} value The value to process.
     * @returns {Object} Returns the object.
     */
    function toObject(value) {
      return isObject(value) ? value : Object(value);
    }

    /**
     * Converts `value` to property path array if it is not one.
     *
     * @private
     * @param {*} value The value to process.
     * @returns {Array} Returns the property path array.
     */
    function toPath(value) {
      if (isArray(value)) {
        return value;
      }
      var result = [];
      baseToString(value).replace(rePropName, function(match, number, quote, string) {
        result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
      });
      return result;
    }

    /**
     * Creates a clone of `wrapper`.
     *
     * @private
     * @param {Object} wrapper The wrapper to clone.
     * @returns {Object} Returns the cloned wrapper.
     */
    function wrapperClone(wrapper) {
      return wrapper instanceof LazyWrapper
        ? wrapper.clone()
        : new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__, arrayCopy(wrapper.__actions__));
    }

    /*------------------------------------------------------------------------*/

    /**
     * Creates an array of elements split into groups the length of `size`.
     * If `collection` can't be split evenly, the final chunk will be the remaining
     * elements.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to process.
     * @param {number} [size=1] The length of each chunk.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {Array} Returns the new array containing chunks.
     * @example
     *
     * _.chunk(['a', 'b', 'c', 'd'], 2);
     * // => [['a', 'b'], ['c', 'd']]
     *
     * _.chunk(['a', 'b', 'c', 'd'], 3);
     * // => [['a', 'b', 'c'], ['d']]
     */
    function chunk(array, size, guard) {
      if (guard ? isIterateeCall(array, size, guard) : size == null) {
        size = 1;
      } else {
        size = nativeMax(+size || 1, 1);
      }
      var index = 0,
          length = array ? array.length : 0,
          resIndex = -1,
          result = Array(ceil(length / size));

      while (index < length) {
        result[++resIndex] = baseSlice(array, index, (index += size));
      }
      return result;
    }

    /**
     * Creates an array with all falsey values removed. The values `false`, `null`,
     * `0`, `""`, `undefined`, and `NaN` are falsey.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to compact.
     * @returns {Array} Returns the new array of filtered values.
     * @example
     *
     * _.compact([0, 1, false, 2, '', 3]);
     * // => [1, 2, 3]
     */
    function compact(array) {
      var index = -1,
          length = array ? array.length : 0,
          resIndex = -1,
          result = [];

      while (++index < length) {
        var value = array[index];
        if (value) {
          result[++resIndex] = value;
        }
      }
      return result;
    }

    /**
     * Creates an array excluding all values of the provided arrays using
     * `SameValueZero` for equality comparisons.
     *
     * **Note:** [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
     * comparisons are like strict equality comparisons, e.g. `===`, except that
     * `NaN` matches `NaN`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {...Array} [values] The arrays of values to exclude.
     * @returns {Array} Returns the new array of filtered values.
     * @example
     *
     * _.difference([1, 2, 3], [4, 2]);
     * // => [1, 3]
     */
    var difference = restParam(function(array, values) {
      return (isArray(array) || isArguments(array))
        ? baseDifference(array, baseFlatten(values, false, true))
        : [];
    });

    /**
     * Creates a slice of `array` with `n` elements dropped from the beginning.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to query.
     * @param {number} [n=1] The number of elements to drop.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.drop([1, 2, 3]);
     * // => [2, 3]
     *
     * _.drop([1, 2, 3], 2);
     * // => [3]
     *
     * _.drop([1, 2, 3], 5);
     * // => []
     *
     * _.drop([1, 2, 3], 0);
     * // => [1, 2, 3]
     */
    function drop(array, n, guard) {
      var length = array ? array.length : 0;
      if (!length) {
        return [];
      }
      if (guard ? isIterateeCall(array, n, guard) : n == null) {
        n = 1;
      }
      return baseSlice(array, n < 0 ? 0 : n);
    }

    /**
     * Creates a slice of `array` with `n` elements dropped from the end.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to query.
     * @param {number} [n=1] The number of elements to drop.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.dropRight([1, 2, 3]);
     * // => [1, 2]
     *
     * _.dropRight([1, 2, 3], 2);
     * // => [1]
     *
     * _.dropRight([1, 2, 3], 5);
     * // => []
     *
     * _.dropRight([1, 2, 3], 0);
     * // => [1, 2, 3]
     */
    function dropRight(array, n, guard) {
      var length = array ? array.length : 0;
      if (!length) {
        return [];
      }
      if (guard ? isIterateeCall(array, n, guard) : n == null) {
        n = 1;
      }
      n = length - (+n || 0);
      return baseSlice(array, 0, n < 0 ? 0 : n);
    }

    /**
     * Creates a slice of `array` excluding elements dropped from the end.
     * Elements are dropped until `predicate` returns falsey. The predicate is
     * bound to `thisArg` and invoked with three arguments: (value, index, array).
     *
     * If a property name is provided for `predicate` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `predicate` the created `_.matches` style
     * callback returns `true` for elements that match the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to query.
     * @param {Function|Object|string} [predicate=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.dropRightWhile([1, 2, 3], function(n) {
     *   return n > 1;
     * });
     * // => [1]
     *
     * var users = [
     *   { 'user': 'barney',  'active': true },
     *   { 'user': 'fred',    'active': false },
     *   { 'user': 'pebbles', 'active': false }
     * ];
     *
     * // using the `_.matches` callback shorthand
     * _.pluck(_.dropRightWhile(users, { 'user': 'pebbles', 'active': false }), 'user');
     * // => ['barney', 'fred']
     *
     * // using the `_.matchesProperty` callback shorthand
     * _.pluck(_.dropRightWhile(users, 'active', false), 'user');
     * // => ['barney']
     *
     * // using the `_.property` callback shorthand
     * _.pluck(_.dropRightWhile(users, 'active'), 'user');
     * // => ['barney', 'fred', 'pebbles']
     */
    function dropRightWhile(array, predicate, thisArg) {
      return (array && array.length)
        ? baseWhile(array, getCallback(predicate, thisArg, 3), true, true)
        : [];
    }

    /**
     * Creates a slice of `array` excluding elements dropped from the beginning.
     * Elements are dropped until `predicate` returns falsey. The predicate is
     * bound to `thisArg` and invoked with three arguments: (value, index, array).
     *
     * If a property name is provided for `predicate` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `predicate` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to query.
     * @param {Function|Object|string} [predicate=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.dropWhile([1, 2, 3], function(n) {
     *   return n < 3;
     * });
     * // => [3]
     *
     * var users = [
     *   { 'user': 'barney',  'active': false },
     *   { 'user': 'fred',    'active': false },
     *   { 'user': 'pebbles', 'active': true }
     * ];
     *
     * // using the `_.matches` callback shorthand
     * _.pluck(_.dropWhile(users, { 'user': 'barney', 'active': false }), 'user');
     * // => ['fred', 'pebbles']
     *
     * // using the `_.matchesProperty` callback shorthand
     * _.pluck(_.dropWhile(users, 'active', false), 'user');
     * // => ['pebbles']
     *
     * // using the `_.property` callback shorthand
     * _.pluck(_.dropWhile(users, 'active'), 'user');
     * // => ['barney', 'fred', 'pebbles']
     */
    function dropWhile(array, predicate, thisArg) {
      return (array && array.length)
        ? baseWhile(array, getCallback(predicate, thisArg, 3), true)
        : [];
    }

    /**
     * Fills elements of `array` with `value` from `start` up to, but not
     * including, `end`.
     *
     * **Note:** This method mutates `array`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to fill.
     * @param {*} value The value to fill `array` with.
     * @param {number} [start=0] The start position.
     * @param {number} [end=array.length] The end position.
     * @returns {Array} Returns `array`.
     * @example
     *
     * var array = [1, 2, 3];
     *
     * _.fill(array, 'a');
     * console.log(array);
     * // => ['a', 'a', 'a']
     *
     * _.fill(Array(3), 2);
     * // => [2, 2, 2]
     *
     * _.fill([4, 6, 8], '*', 1, 2);
     * // => [4, '*', 8]
     */
    function fill(array, value, start, end) {
      var length = array ? array.length : 0;
      if (!length) {
        return [];
      }
      if (start && typeof start != 'number' && isIterateeCall(array, value, start)) {
        start = 0;
        end = length;
      }
      return baseFill(array, value, start, end);
    }

    /**
     * This method is like `_.find` except that it returns the index of the first
     * element `predicate` returns truthy for instead of the element itself.
     *
     * If a property name is provided for `predicate` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `predicate` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to search.
     * @param {Function|Object|string} [predicate=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {number} Returns the index of the found element, else `-1`.
     * @example
     *
     * var users = [
     *   { 'user': 'barney',  'active': false },
     *   { 'user': 'fred',    'active': false },
     *   { 'user': 'pebbles', 'active': true }
     * ];
     *
     * _.findIndex(users, function(chr) {
     *   return chr.user == 'barney';
     * });
     * // => 0
     *
     * // using the `_.matches` callback shorthand
     * _.findIndex(users, { 'user': 'fred', 'active': false });
     * // => 1
     *
     * // using the `_.matchesProperty` callback shorthand
     * _.findIndex(users, 'active', false);
     * // => 0
     *
     * // using the `_.property` callback shorthand
     * _.findIndex(users, 'active');
     * // => 2
     */
    var findIndex = createFindIndex();

    /**
     * This method is like `_.findIndex` except that it iterates over elements
     * of `collection` from right to left.
     *
     * If a property name is provided for `predicate` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `predicate` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to search.
     * @param {Function|Object|string} [predicate=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {number} Returns the index of the found element, else `-1`.
     * @example
     *
     * var users = [
     *   { 'user': 'barney',  'active': true },
     *   { 'user': 'fred',    'active': false },
     *   { 'user': 'pebbles', 'active': false }
     * ];
     *
     * _.findLastIndex(users, function(chr) {
     *   return chr.user == 'pebbles';
     * });
     * // => 2
     *
     * // using the `_.matches` callback shorthand
     * _.findLastIndex(users, { 'user': 'barney', 'active': true });
     * // => 0
     *
     * // using the `_.matchesProperty` callback shorthand
     * _.findLastIndex(users, 'active', false);
     * // => 2
     *
     * // using the `_.property` callback shorthand
     * _.findLastIndex(users, 'active');
     * // => 0
     */
    var findLastIndex = createFindIndex(true);

    /**
     * Gets the first element of `array`.
     *
     * @static
     * @memberOf _
     * @alias head
     * @category Array
     * @param {Array} array The array to query.
     * @returns {*} Returns the first element of `array`.
     * @example
     *
     * _.first([1, 2, 3]);
     * // => 1
     *
     * _.first([]);
     * // => undefined
     */
    function first(array) {
      return array ? array[0] : undefined;
    }

    /**
     * Flattens a nested array. If `isDeep` is `true` the array is recursively
     * flattened, otherwise it is only flattened a single level.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to flatten.
     * @param {boolean} [isDeep] Specify a deep flatten.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {Array} Returns the new flattened array.
     * @example
     *
     * _.flatten([1, [2, 3, [4]]]);
     * // => [1, 2, 3, [4]]
     *
     * // using `isDeep`
     * _.flatten([1, [2, 3, [4]]], true);
     * // => [1, 2, 3, 4]
     */
    function flatten(array, isDeep, guard) {
      var length = array ? array.length : 0;
      if (guard && isIterateeCall(array, isDeep, guard)) {
        isDeep = false;
      }
      return length ? baseFlatten(array, isDeep) : [];
    }

    /**
     * Recursively flattens a nested array.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to recursively flatten.
     * @returns {Array} Returns the new flattened array.
     * @example
     *
     * _.flattenDeep([1, [2, 3, [4]]]);
     * // => [1, 2, 3, 4]
     */
    function flattenDeep(array) {
      var length = array ? array.length : 0;
      return length ? baseFlatten(array, true) : [];
    }

    /**
     * Gets the index at which the first occurrence of `value` is found in `array`
     * using `SameValueZero` for equality comparisons. If `fromIndex` is negative,
     * it is used as the offset from the end of `array`. If `array` is sorted
     * providing `true` for `fromIndex` performs a faster binary search.
     *
     * **Note:** [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
     * comparisons are like strict equality comparisons, e.g. `===`, except that
     * `NaN` matches `NaN`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to search.
     * @param {*} value The value to search for.
     * @param {boolean|number} [fromIndex=0] The index to search from or `true`
     *  to perform a binary search on a sorted array.
     * @returns {number} Returns the index of the matched value, else `-1`.
     * @example
     *
     * _.indexOf([1, 2, 1, 2], 2);
     * // => 1
     *
     * // using `fromIndex`
     * _.indexOf([1, 2, 1, 2], 2, 2);
     * // => 3
     *
     * // performing a binary search
     * _.indexOf([1, 1, 2, 2], 2, true);
     * // => 2
     */
    function indexOf(array, value, fromIndex) {
      var length = array ? array.length : 0;
      if (!length) {
        return -1;
      }
      if (typeof fromIndex == 'number') {
        fromIndex = fromIndex < 0 ? nativeMax(length + fromIndex, 0) : fromIndex;
      } else if (fromIndex) {
        var index = binaryIndex(array, value),
            other = array[index];

        if (value === value ? (value === other) : (other !== other)) {
          return index;
        }
        return -1;
      }
      return baseIndexOf(array, value, fromIndex || 0);
    }

    /**
     * Gets all but the last element of `array`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to query.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.initial([1, 2, 3]);
     * // => [1, 2]
     */
    function initial(array) {
      return dropRight(array, 1);
    }

    /**
     * Creates an array of unique values in all provided arrays using `SameValueZero`
     * for equality comparisons.
     *
     * **Note:** [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
     * comparisons are like strict equality comparisons, e.g. `===`, except that
     * `NaN` matches `NaN`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @returns {Array} Returns the new array of shared values.
     * @example
     * _.intersection([1, 2], [4, 2], [2, 1]);
     * // => [2]
     */
    function intersection() {
      var args = [],
          argsIndex = -1,
          argsLength = arguments.length,
          caches = [],
          indexOf = getIndexOf(),
          isCommon = indexOf == baseIndexOf,
          result = [];

      while (++argsIndex < argsLength) {
        var value = arguments[argsIndex];
        if (isArray(value) || isArguments(value)) {
          args.push(value);
          caches.push((isCommon && value.length >= 120) ? createCache(argsIndex && value) : null);
        }
      }
      argsLength = args.length;
      if (argsLength < 2) {
        return result;
      }
      var array = args[0],
          index = -1,
          length = array ? array.length : 0,
          seen = caches[0];

      outer:
      while (++index < length) {
        value = array[index];
        if ((seen ? cacheIndexOf(seen, value) : indexOf(result, value, 0)) < 0) {
          argsIndex = argsLength;
          while (--argsIndex) {
            var cache = caches[argsIndex];
            if ((cache ? cacheIndexOf(cache, value) : indexOf(args[argsIndex], value, 0)) < 0) {
              continue outer;
            }
          }
          if (seen) {
            seen.push(value);
          }
          result.push(value);
        }
      }
      return result;
    }

    /**
     * Gets the last element of `array`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to query.
     * @returns {*} Returns the last element of `array`.
     * @example
     *
     * _.last([1, 2, 3]);
     * // => 3
     */
    function last(array) {
      var length = array ? array.length : 0;
      return length ? array[length - 1] : undefined;
    }

    /**
     * This method is like `_.indexOf` except that it iterates over elements of
     * `array` from right to left.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to search.
     * @param {*} value The value to search for.
     * @param {boolean|number} [fromIndex=array.length-1] The index to search from
     *  or `true` to perform a binary search on a sorted array.
     * @returns {number} Returns the index of the matched value, else `-1`.
     * @example
     *
     * _.lastIndexOf([1, 2, 1, 2], 2);
     * // => 3
     *
     * // using `fromIndex`
     * _.lastIndexOf([1, 2, 1, 2], 2, 2);
     * // => 1
     *
     * // performing a binary search
     * _.lastIndexOf([1, 1, 2, 2], 2, true);
     * // => 3
     */
    function lastIndexOf(array, value, fromIndex) {
      var length = array ? array.length : 0;
      if (!length) {
        return -1;
      }
      var index = length;
      if (typeof fromIndex == 'number') {
        index = (fromIndex < 0 ? nativeMax(length + fromIndex, 0) : nativeMin(fromIndex || 0, length - 1)) + 1;
      } else if (fromIndex) {
        index = binaryIndex(array, value, true) - 1;
        var other = array[index];
        if (value === value ? (value === other) : (other !== other)) {
          return index;
        }
        return -1;
      }
      if (value !== value) {
        return indexOfNaN(array, index, true);
      }
      while (index--) {
        if (array[index] === value) {
          return index;
        }
      }
      return -1;
    }

    /**
     * Removes all provided values from `array` using `SameValueZero` for equality
     * comparisons.
     *
     * **Notes:**
     *  - Unlike `_.without`, this method mutates `array`
     *  - [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
     *    comparisons are like strict equality comparisons, e.g. `===`, except
     *    that `NaN` matches `NaN`
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to modify.
     * @param {...*} [values] The values to remove.
     * @returns {Array} Returns `array`.
     * @example
     *
     * var array = [1, 2, 3, 1, 2, 3];
     *
     * _.pull(array, 2, 3);
     * console.log(array);
     * // => [1, 1]
     */
    function pull() {
      var args = arguments,
          array = args[0];

      if (!(array && array.length)) {
        return array;
      }
      var index = 0,
          indexOf = getIndexOf(),
          length = args.length;

      while (++index < length) {
        var fromIndex = 0,
            value = args[index];

        while ((fromIndex = indexOf(array, value, fromIndex)) > -1) {
          splice.call(array, fromIndex, 1);
        }
      }
      return array;
    }

    /**
     * Removes elements from `array` corresponding to the given indexes and returns
     * an array of the removed elements. Indexes may be specified as an array of
     * indexes or as individual arguments.
     *
     * **Note:** Unlike `_.at`, this method mutates `array`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to modify.
     * @param {...(number|number[])} [indexes] The indexes of elements to remove,
     *  specified as individual indexes or arrays of indexes.
     * @returns {Array} Returns the new array of removed elements.
     * @example
     *
     * var array = [5, 10, 15, 20];
     * var evens = _.pullAt(array, 1, 3);
     *
     * console.log(array);
     * // => [5, 15]
     *
     * console.log(evens);
     * // => [10, 20]
     */
    var pullAt = restParam(function(array, indexes) {
      array || (array = []);
      indexes = baseFlatten(indexes);

      var result = baseAt(array, indexes);
      basePullAt(array, indexes.sort(baseCompareAscending));
      return result;
    });

    /**
     * Removes all elements from `array` that `predicate` returns truthy for
     * and returns an array of the removed elements. The predicate is bound to
     * `thisArg` and invoked with three arguments: (value, index, array).
     *
     * If a property name is provided for `predicate` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `predicate` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * **Note:** Unlike `_.filter`, this method mutates `array`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to modify.
     * @param {Function|Object|string} [predicate=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {Array} Returns the new array of removed elements.
     * @example
     *
     * var array = [1, 2, 3, 4];
     * var evens = _.remove(array, function(n) {
     *   return n % 2 == 0;
     * });
     *
     * console.log(array);
     * // => [1, 3]
     *
     * console.log(evens);
     * // => [2, 4]
     */
    function remove(array, predicate, thisArg) {
      var result = [];
      if (!(array && array.length)) {
        return result;
      }
      var index = -1,
          indexes = [],
          length = array.length;

      predicate = getCallback(predicate, thisArg, 3);
      while (++index < length) {
        var value = array[index];
        if (predicate(value, index, array)) {
          result.push(value);
          indexes.push(index);
        }
      }
      basePullAt(array, indexes);
      return result;
    }

    /**
     * Gets all but the first element of `array`.
     *
     * @static
     * @memberOf _
     * @alias tail
     * @category Array
     * @param {Array} array The array to query.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.rest([1, 2, 3]);
     * // => [2, 3]
     */
    function rest(array) {
      return drop(array, 1);
    }

    /**
     * Creates a slice of `array` from `start` up to, but not including, `end`.
     *
     * **Note:** This method is used instead of `Array#slice` to support node
     * lists in IE < 9 and to ensure dense arrays are returned.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to slice.
     * @param {number} [start=0] The start position.
     * @param {number} [end=array.length] The end position.
     * @returns {Array} Returns the slice of `array`.
     */
    function slice(array, start, end) {
      var length = array ? array.length : 0;
      if (!length) {
        return [];
      }
      if (end && typeof end != 'number' && isIterateeCall(array, start, end)) {
        start = 0;
        end = length;
      }
      return baseSlice(array, start, end);
    }

    /**
     * Uses a binary search to determine the lowest index at which `value` should
     * be inserted into `array` in order to maintain its sort order. If an iteratee
     * function is provided it is invoked for `value` and each element of `array`
     * to compute their sort ranking. The iteratee is bound to `thisArg` and
     * invoked with one argument; (value).
     *
     * If a property name is provided for `iteratee` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `iteratee` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The sorted array to inspect.
     * @param {*} value The value to evaluate.
     * @param {Function|Object|string} [iteratee=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {number} Returns the index at which `value` should be inserted
     *  into `array`.
     * @example
     *
     * _.sortedIndex([30, 50], 40);
     * // => 1
     *
     * _.sortedIndex([4, 4, 5, 5], 5);
     * // => 2
     *
     * var dict = { 'data': { 'thirty': 30, 'forty': 40, 'fifty': 50 } };
     *
     * // using an iteratee function
     * _.sortedIndex(['thirty', 'fifty'], 'forty', function(word) {
     *   return this.data[word];
     * }, dict);
     * // => 1
     *
     * // using the `_.property` callback shorthand
     * _.sortedIndex([{ 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x');
     * // => 1
     */
    var sortedIndex = createSortedIndex();

    /**
     * This method is like `_.sortedIndex` except that it returns the highest
     * index at which `value` should be inserted into `array` in order to
     * maintain its sort order.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The sorted array to inspect.
     * @param {*} value The value to evaluate.
     * @param {Function|Object|string} [iteratee=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {number} Returns the index at which `value` should be inserted
     *  into `array`.
     * @example
     *
     * _.sortedLastIndex([4, 4, 5, 5], 5);
     * // => 4
     */
    var sortedLastIndex = createSortedIndex(true);

    /**
     * Creates a slice of `array` with `n` elements taken from the beginning.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to query.
     * @param {number} [n=1] The number of elements to take.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.take([1, 2, 3]);
     * // => [1]
     *
     * _.take([1, 2, 3], 2);
     * // => [1, 2]
     *
     * _.take([1, 2, 3], 5);
     * // => [1, 2, 3]
     *
     * _.take([1, 2, 3], 0);
     * // => []
     */
    function take(array, n, guard) {
      var length = array ? array.length : 0;
      if (!length) {
        return [];
      }
      if (guard ? isIterateeCall(array, n, guard) : n == null) {
        n = 1;
      }
      return baseSlice(array, 0, n < 0 ? 0 : n);
    }

    /**
     * Creates a slice of `array` with `n` elements taken from the end.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to query.
     * @param {number} [n=1] The number of elements to take.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.takeRight([1, 2, 3]);
     * // => [3]
     *
     * _.takeRight([1, 2, 3], 2);
     * // => [2, 3]
     *
     * _.takeRight([1, 2, 3], 5);
     * // => [1, 2, 3]
     *
     * _.takeRight([1, 2, 3], 0);
     * // => []
     */
    function takeRight(array, n, guard) {
      var length = array ? array.length : 0;
      if (!length) {
        return [];
      }
      if (guard ? isIterateeCall(array, n, guard) : n == null) {
        n = 1;
      }
      n = length - (+n || 0);
      return baseSlice(array, n < 0 ? 0 : n);
    }

    /**
     * Creates a slice of `array` with elements taken from the end. Elements are
     * taken until `predicate` returns falsey. The predicate is bound to `thisArg`
     * and invoked with three arguments: (value, index, array).
     *
     * If a property name is provided for `predicate` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `predicate` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to query.
     * @param {Function|Object|string} [predicate=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.takeRightWhile([1, 2, 3], function(n) {
     *   return n > 1;
     * });
     * // => [2, 3]
     *
     * var users = [
     *   { 'user': 'barney',  'active': true },
     *   { 'user': 'fred',    'active': false },
     *   { 'user': 'pebbles', 'active': false }
     * ];
     *
     * // using the `_.matches` callback shorthand
     * _.pluck(_.takeRightWhile(users, { 'user': 'pebbles', 'active': false }), 'user');
     * // => ['pebbles']
     *
     * // using the `_.matchesProperty` callback shorthand
     * _.pluck(_.takeRightWhile(users, 'active', false), 'user');
     * // => ['fred', 'pebbles']
     *
     * // using the `_.property` callback shorthand
     * _.pluck(_.takeRightWhile(users, 'active'), 'user');
     * // => []
     */
    function takeRightWhile(array, predicate, thisArg) {
      return (array && array.length)
        ? baseWhile(array, getCallback(predicate, thisArg, 3), false, true)
        : [];
    }

    /**
     * Creates a slice of `array` with elements taken from the beginning. Elements
     * are taken until `predicate` returns falsey. The predicate is bound to
     * `thisArg` and invoked with three arguments: (value, index, array).
     *
     * If a property name is provided for `predicate` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `predicate` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to query.
     * @param {Function|Object|string} [predicate=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.takeWhile([1, 2, 3], function(n) {
     *   return n < 3;
     * });
     * // => [1, 2]
     *
     * var users = [
     *   { 'user': 'barney',  'active': false },
     *   { 'user': 'fred',    'active': false},
     *   { 'user': 'pebbles', 'active': true }
     * ];
     *
     * // using the `_.matches` callback shorthand
     * _.pluck(_.takeWhile(users, { 'user': 'barney', 'active': false }), 'user');
     * // => ['barney']
     *
     * // using the `_.matchesProperty` callback shorthand
     * _.pluck(_.takeWhile(users, 'active', false), 'user');
     * // => ['barney', 'fred']
     *
     * // using the `_.property` callback shorthand
     * _.pluck(_.takeWhile(users, 'active'), 'user');
     * // => []
     */
    function takeWhile(array, predicate, thisArg) {
      return (array && array.length)
        ? baseWhile(array, getCallback(predicate, thisArg, 3))
        : [];
    }

    /**
     * Creates an array of unique values, in order, of the provided arrays using
     * `SameValueZero` for equality comparisons.
     *
     * **Note:** [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
     * comparisons are like strict equality comparisons, e.g. `===`, except that
     * `NaN` matches `NaN`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @returns {Array} Returns the new array of combined values.
     * @example
     *
     * _.union([1, 2], [4, 2], [2, 1]);
     * // => [1, 2, 4]
     */
    var union = restParam(function(arrays) {
      return baseUniq(baseFlatten(arrays, false, true));
    });

    /**
     * Creates a duplicate-free version of an array, using `SameValueZero` for
     * equality comparisons, in which only the first occurence of each element
     * is kept. Providing `true` for `isSorted` performs a faster search algorithm
     * for sorted arrays. If an iteratee function is provided it is invoked for
     * each element in the array to generate the criterion by which uniqueness
     * is computed. The `iteratee` is bound to `thisArg` and invoked with three
     * arguments: (value, index, array).
     *
     * If a property name is provided for `iteratee` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `iteratee` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * **Note:** [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
     * comparisons are like strict equality comparisons, e.g. `===`, except that
     * `NaN` matches `NaN`.
     *
     * @static
     * @memberOf _
     * @alias unique
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {boolean} [isSorted] Specify the array is sorted.
     * @param {Function|Object|string} [iteratee] The function invoked per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {Array} Returns the new duplicate-value-free array.
     * @example
     *
     * _.uniq([2, 1, 2]);
     * // => [2, 1]
     *
     * // using `isSorted`
     * _.uniq([1, 1, 2], true);
     * // => [1, 2]
     *
     * // using an iteratee function
     * _.uniq([1, 2.5, 1.5, 2], function(n) {
     *   return this.floor(n);
     * }, Math);
     * // => [1, 2.5]
     *
     * // using the `_.property` callback shorthand
     * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
     * // => [{ 'x': 1 }, { 'x': 2 }]
     */
    function uniq(array, isSorted, iteratee, thisArg) {
      var length = array ? array.length : 0;
      if (!length) {
        return [];
      }
      if (isSorted != null && typeof isSorted != 'boolean') {
        thisArg = iteratee;
        iteratee = isIterateeCall(array, isSorted, thisArg) ? null : isSorted;
        isSorted = false;
      }
      var func = getCallback();
      if (!(func === baseCallback && iteratee == null)) {
        iteratee = func(iteratee, thisArg, 3);
      }
      return (isSorted && getIndexOf() == baseIndexOf)
        ? sortedUniq(array, iteratee)
        : baseUniq(array, iteratee);
    }

    /**
     * This method is like `_.zip` except that it accepts an array of grouped
     * elements and creates an array regrouping the elements to their pre-`_.zip`
     * configuration.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array of grouped elements to process.
     * @returns {Array} Returns the new array of regrouped elements.
     * @example
     *
     * var zipped = _.zip(['fred', 'barney'], [30, 40], [true, false]);
     * // => [['fred', 30, true], ['barney', 40, false]]
     *
     * _.unzip(zipped);
     * // => [['fred', 'barney'], [30, 40], [true, false]]
     */
    function unzip(array) {
      var index = -1,
          length = (array && array.length && arrayMax(arrayMap(array, getLength))) >>> 0,
          result = Array(length);

      while (++index < length) {
        result[index] = arrayMap(array, baseProperty(index));
      }
      return result;
    }

    /**
     * Creates an array excluding all provided values using `SameValueZero` for
     * equality comparisons.
     *
     * **Note:** [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
     * comparisons are like strict equality comparisons, e.g. `===`, except that
     * `NaN` matches `NaN`.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {Array} array The array to filter.
     * @param {...*} [values] The values to exclude.
     * @returns {Array} Returns the new array of filtered values.
     * @example
     *
     * _.without([1, 2, 1, 3], 1, 2);
     * // => [3]
     */
    var without = restParam(function(array, values) {
      return (isArray(array) || isArguments(array))
        ? baseDifference(array, values)
        : [];
    });

    /**
     * Creates an array that is the [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
     * of the provided arrays.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @returns {Array} Returns the new array of values.
     * @example
     *
     * _.xor([1, 2], [4, 2]);
     * // => [1, 4]
     */
    function xor() {
      var index = -1,
          length = arguments.length;

      while (++index < length) {
        var array = arguments[index];
        if (isArray(array) || isArguments(array)) {
          var result = result
            ? baseDifference(result, array).concat(baseDifference(array, result))
            : array;
        }
      }
      return result ? baseUniq(result) : [];
    }

    /**
     * Creates an array of grouped elements, the first of which contains the first
     * elements of the given arrays, the second of which contains the second elements
     * of the given arrays, and so on.
     *
     * @static
     * @memberOf _
     * @category Array
     * @param {...Array} [arrays] The arrays to process.
     * @returns {Array} Returns the new array of grouped elements.
     * @example
     *
     * _.zip(['fred', 'barney'], [30, 40], [true, false]);
     * // => [['fred', 30, true], ['barney', 40, false]]
     */
    var zip = restParam(unzip);

    /**
     * The inverse of `_.pairs`; this method returns an object composed from arrays
     * of property names and values. Provide either a single two dimensional array,
     * e.g. `[[key1, value1], [key2, value2]]` or two arrays, one of property names
     * and one of corresponding values.
     *
     * @static
     * @memberOf _
     * @alias object
     * @category Array
     * @param {Array} props The property names.
     * @param {Array} [values=[]] The property values.
     * @returns {Object} Returns the new object.
     * @example
     *
     * _.zipObject([['fred', 30], ['barney', 40]]);
     * // => { 'fred': 30, 'barney': 40 }
     *
     * _.zipObject(['fred', 'barney'], [30, 40]);
     * // => { 'fred': 30, 'barney': 40 }
     */
    function zipObject(props, values) {
      var index = -1,
          length = props ? props.length : 0,
          result = {};

      if (length && !values && !isArray(props[0])) {
        values = [];
      }
      while (++index < length) {
        var key = props[index];
        if (values) {
          result[key] = values[index];
        } else if (key) {
          result[key[0]] = key[1];
        }
      }
      return result;
    }

    /*------------------------------------------------------------------------*/

    /**
     * Creates a `lodash` object that wraps `value` with explicit method
     * chaining enabled.
     *
     * @static
     * @memberOf _
     * @category Chain
     * @param {*} value The value to wrap.
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * var users = [
     *   { 'user': 'barney',  'age': 36 },
     *   { 'user': 'fred',    'age': 40 },
     *   { 'user': 'pebbles', 'age': 1 }
     * ];
     *
     * var youngest = _.chain(users)
     *   .sortBy('age')
     *   .map(function(chr) {
     *     return chr.user + ' is ' + chr.age;
     *   })
     *   .first()
     *   .value();
     * // => 'pebbles is 1'
     */
    function chain(value) {
      var result = lodash(value);
      result.__chain__ = true;
      return result;
    }

    /**
     * This method invokes `interceptor` and returns `value`. The interceptor is
     * bound to `thisArg` and invoked with one argument; (value). The purpose of
     * this method is to "tap into" a method chain in order to perform operations
     * on intermediate results within the chain.
     *
     * @static
     * @memberOf _
     * @category Chain
     * @param {*} value The value to provide to `interceptor`.
     * @param {Function} interceptor The function to invoke.
     * @param {*} [thisArg] The `this` binding of `interceptor`.
     * @returns {*} Returns `value`.
     * @example
     *
     * _([1, 2, 3])
     *  .tap(function(array) {
     *    array.pop();
     *  })
     *  .reverse()
     *  .value();
     * // => [2, 1]
     */
    function tap(value, interceptor, thisArg) {
      interceptor.call(thisArg, value);
      return value;
    }

    /**
     * This method is like `_.tap` except that it returns the result of `interceptor`.
     *
     * @static
     * @memberOf _
     * @category Chain
     * @param {*} value The value to provide to `interceptor`.
     * @param {Function} interceptor The function to invoke.
     * @param {*} [thisArg] The `this` binding of `interceptor`.
     * @returns {*} Returns the result of `interceptor`.
     * @example
     *
     * _('  abc  ')
     *  .chain()
     *  .trim()
     *  .thru(function(value) {
     *    return [value];
     *  })
     *  .value();
     * // => ['abc']
     */
    function thru(value, interceptor, thisArg) {
      return interceptor.call(thisArg, value);
    }

    /**
     * Enables explicit method chaining on the wrapper object.
     *
     * @name chain
     * @memberOf _
     * @category Chain
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * var users = [
     *   { 'user': 'barney', 'age': 36 },
     *   { 'user': 'fred',   'age': 40 }
     * ];
     *
     * // without explicit chaining
     * _(users).first();
     * // => { 'user': 'barney', 'age': 36 }
     *
     * // with explicit chaining
     * _(users).chain()
     *   .first()
     *   .pick('user')
     *   .value();
     * // => { 'user': 'barney' }
     */
    function wrapperChain() {
      return chain(this);
    }

    /**
     * Executes the chained sequence and returns the wrapped result.
     *
     * @name commit
     * @memberOf _
     * @category Chain
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * var array = [1, 2];
     * var wrapper = _(array).push(3);
     *
     * console.log(array);
     * // => [1, 2]
     *
     * wrapper = wrapper.commit();
     * console.log(array);
     * // => [1, 2, 3]
     *
     * wrapper.last();
     * // => 3
     *
     * console.log(array);
     * // => [1, 2, 3]
     */
    function wrapperCommit() {
      return new LodashWrapper(this.value(), this.__chain__);
    }

    /**
     * Creates a clone of the chained sequence planting `value` as the wrapped value.
     *
     * @name plant
     * @memberOf _
     * @category Chain
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * var array = [1, 2];
     * var wrapper = _(array).map(function(value) {
     *   return Math.pow(value, 2);
     * });
     *
     * var other = [3, 4];
     * var otherWrapper = wrapper.plant(other);
     *
     * otherWrapper.value();
     * // => [9, 16]
     *
     * wrapper.value();
     * // => [1, 4]
     */
    function wrapperPlant(value) {
      var result,
          parent = this;

      while (parent instanceof baseLodash) {
        var clone = wrapperClone(parent);
        if (result) {
          previous.__wrapped__ = clone;
        } else {
          result = clone;
        }
        var previous = clone;
        parent = parent.__wrapped__;
      }
      previous.__wrapped__ = value;
      return result;
    }

    /**
     * Reverses the wrapped array so the first element becomes the last, the
     * second element becomes the second to last, and so on.
     *
     * **Note:** This method mutates the wrapped array.
     *
     * @name reverse
     * @memberOf _
     * @category Chain
     * @returns {Object} Returns the new reversed `lodash` wrapper instance.
     * @example
     *
     * var array = [1, 2, 3];
     *
     * _(array).reverse().value()
     * // => [3, 2, 1]
     *
     * console.log(array);
     * // => [3, 2, 1]
     */
    function wrapperReverse() {
      var value = this.__wrapped__;
      if (value instanceof LazyWrapper) {
        if (this.__actions__.length) {
          value = new LazyWrapper(this);
        }
        return new LodashWrapper(value.reverse(), this.__chain__);
      }
      return this.thru(function(value) {
        return value.reverse();
      });
    }

    /**
     * Produces the result of coercing the unwrapped value to a string.
     *
     * @name toString
     * @memberOf _
     * @category Chain
     * @returns {string} Returns the coerced string value.
     * @example
     *
     * _([1, 2, 3]).toString();
     * // => '1,2,3'
     */
    function wrapperToString() {
      return (this.value() + '');
    }

    /**
     * Executes the chained sequence to extract the unwrapped value.
     *
     * @name value
     * @memberOf _
     * @alias run, toJSON, valueOf
     * @category Chain
     * @returns {*} Returns the resolved unwrapped value.
     * @example
     *
     * _([1, 2, 3]).value();
     * // => [1, 2, 3]
     */
    function wrapperValue() {
      return baseWrapperValue(this.__wrapped__, this.__actions__);
    }

    /*------------------------------------------------------------------------*/

    /**
     * Creates an array of elements corresponding to the given keys, or indexes,
     * of `collection`. Keys may be specified as individual arguments or as arrays
     * of keys.
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {...(number|number[]|string|string[])} [props] The property names
     *  or indexes of elements to pick, specified individually or in arrays.
     * @returns {Array} Returns the new array of picked elements.
     * @example
     *
     * _.at(['a', 'b', 'c'], [0, 2]);
     * // => ['a', 'c']
     *
     * _.at(['barney', 'fred', 'pebbles'], 0, 2);
     * // => ['barney', 'pebbles']
     */
    var at = restParam(function(collection, props) {
      var length = collection ? getLength(collection) : 0;
      if (isLength(length)) {
        collection = toIterable(collection);
      }
      return baseAt(collection, baseFlatten(props));
    });

    /**
     * Creates an object composed of keys generated from the results of running
     * each element of `collection` through `iteratee`. The corresponding value
     * of each key is the number of times the key was returned by `iteratee`.
     * The `iteratee` is bound to `thisArg` and invoked with three arguments:
     * (value, index|key, collection).
     *
     * If a property name is provided for `iteratee` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `iteratee` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function|Object|string} [iteratee=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {Object} Returns the composed aggregate object.
     * @example
     *
     * _.countBy([4.3, 6.1, 6.4], function(n) {
     *   return Math.floor(n);
     * });
     * // => { '4': 1, '6': 2 }
     *
     * _.countBy([4.3, 6.1, 6.4], function(n) {
     *   return this.floor(n);
     * }, Math);
     * // => { '4': 1, '6': 2 }
     *
     * _.countBy(['one', 'two', 'three'], 'length');
     * // => { '3': 2, '5': 1 }
     */
    var countBy = createAggregator(function(result, value, key) {
      hasOwnProperty.call(result, key) ? ++result[key] : (result[key] = 1);
    });

    /**
     * Checks if `predicate` returns truthy for **all** elements of `collection`.
     * The predicate is bound to `thisArg` and invoked with three arguments:
     * (value, index|key, collection).
     *
     * If a property name is provided for `predicate` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `predicate` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @alias all
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function|Object|string} [predicate=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {boolean} Returns `true` if all elements pass the predicate check,
     *  else `false`.
     * @example
     *
     * _.every([true, 1, null, 'yes'], Boolean);
     * // => false
     *
     * var users = [
     *   { 'user': 'barney', 'active': false },
     *   { 'user': 'fred',   'active': false }
     * ];
     *
     * // using the `_.matches` callback shorthand
     * _.every(users, { 'user': 'barney', 'active': false });
     * // => false
     *
     * // using the `_.matchesProperty` callback shorthand
     * _.every(users, 'active', false);
     * // => true
     *
     * // using the `_.property` callback shorthand
     * _.every(users, 'active');
     * // => false
     */
    function every(collection, predicate, thisArg) {
      var func = isArray(collection) ? arrayEvery : baseEvery;
      if (thisArg && isIterateeCall(collection, predicate, thisArg)) {
        predicate = null;
      }
      if (typeof predicate != 'function' || thisArg !== undefined) {
        predicate = getCallback(predicate, thisArg, 3);
      }
      return func(collection, predicate);
    }

    /**
     * Iterates over elements of `collection`, returning an array of all elements
     * `predicate` returns truthy for. The predicate is bound to `thisArg` and
     * invoked with three arguments: (value, index|key, collection).
     *
     * If a property name is provided for `predicate` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `predicate` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @alias select
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function|Object|string} [predicate=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {Array} Returns the new filtered array.
     * @example
     *
     * _.filter([4, 5, 6], function(n) {
     *   return n % 2 == 0;
     * });
     * // => [4, 6]
     *
     * var users = [
     *   { 'user': 'barney', 'age': 36, 'active': true },
     *   { 'user': 'fred',   'age': 40, 'active': false }
     * ];
     *
     * // using the `_.matches` callback shorthand
     * _.pluck(_.filter(users, { 'age': 36, 'active': true }), 'user');
     * // => ['barney']
     *
     * // using the `_.matchesProperty` callback shorthand
     * _.pluck(_.filter(users, 'active', false), 'user');
     * // => ['fred']
     *
     * // using the `_.property` callback shorthand
     * _.pluck(_.filter(users, 'active'), 'user');
     * // => ['barney']
     */
    function filter(collection, predicate, thisArg) {
      var func = isArray(collection) ? arrayFilter : baseFilter;
      predicate = getCallback(predicate, thisArg, 3);
      return func(collection, predicate);
    }

    /**
     * Iterates over elements of `collection`, returning the first element
     * `predicate` returns truthy for. The predicate is bound to `thisArg` and
     * invoked with three arguments: (value, index|key, collection).
     *
     * If a property name is provided for `predicate` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `predicate` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @alias detect
     * @category Collection
     * @param {Array|Object|string} collection The collection to search.
     * @param {Function|Object|string} [predicate=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {*} Returns the matched element, else `undefined`.
     * @example
     *
     * var users = [
     *   { 'user': 'barney',  'age': 36, 'active': true },
     *   { 'user': 'fred',    'age': 40, 'active': false },
     *   { 'user': 'pebbles', 'age': 1,  'active': true }
     * ];
     *
     * _.result(_.find(users, function(chr) {
     *   return chr.age < 40;
     * }), 'user');
     * // => 'barney'
     *
     * // using the `_.matches` callback shorthand
     * _.result(_.find(users, { 'age': 1, 'active': true }), 'user');
     * // => 'pebbles'
     *
     * // using the `_.matchesProperty` callback shorthand
     * _.result(_.find(users, 'active', false), 'user');
     * // => 'fred'
     *
     * // using the `_.property` callback shorthand
     * _.result(_.find(users, 'active'), 'user');
     * // => 'barney'
     */
    var find = createFind(baseEach);

    /**
     * This method is like `_.find` except that it iterates over elements of
     * `collection` from right to left.
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to search.
     * @param {Function|Object|string} [predicate=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {*} Returns the matched element, else `undefined`.
     * @example
     *
     * _.findLast([1, 2, 3, 4], function(n) {
     *   return n % 2 == 1;
     * });
     * // => 3
     */
    var findLast = createFind(baseEachRight, true);

    /**
     * Performs a deep comparison between each element in `collection` and the
     * source object, returning the first element that has equivalent property
     * values.
     *
     * **Note:** This method supports comparing arrays, booleans, `Date` objects,
     * numbers, `Object` objects, regexes, and strings. Objects are compared by
     * their own, not inherited, enumerable properties. For comparing a single
     * own or inherited property value see `_.matchesProperty`.
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to search.
     * @param {Object} source The object of property values to match.
     * @returns {*} Returns the matched element, else `undefined`.
     * @example
     *
     * var users = [
     *   { 'user': 'barney', 'age': 36, 'active': true },
     *   { 'user': 'fred',   'age': 40, 'active': false }
     * ];
     *
     * _.result(_.findWhere(users, { 'age': 36, 'active': true }), 'user');
     * // => 'barney'
     *
     * _.result(_.findWhere(users, { 'age': 40, 'active': false }), 'user');
     * // => 'fred'
     */
    function findWhere(collection, source) {
      return find(collection, baseMatches(source));
    }

    /**
     * Iterates over elements of `collection` invoking `iteratee` for each element.
     * The `iteratee` is bound to `thisArg` and invoked with three arguments:
     * (value, index|key, collection). Iteratee functions may exit iteration early
     * by explicitly returning `false`.
     *
     * **Note:** As with other "Collections" methods, objects with a "length" property
     * are iterated like arrays. To avoid this behavior `_.forIn` or `_.forOwn`
     * may be used for object iteration.
     *
     * @static
     * @memberOf _
     * @alias each
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {Array|Object|string} Returns `collection`.
     * @example
     *
     * _([1, 2]).forEach(function(n) {
     *   console.log(n);
     * }).value();
     * // => logs each value from left to right and returns the array
     *
     * _.forEach({ 'a': 1, 'b': 2 }, function(n, key) {
     *   console.log(n, key);
     * });
     * // => logs each value-key pair and returns the object (iteration order is not guaranteed)
     */
    var forEach = createForEach(arrayEach, baseEach);

    /**
     * This method is like `_.forEach` except that it iterates over elements of
     * `collection` from right to left.
     *
     * @static
     * @memberOf _
     * @alias eachRight
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {Array|Object|string} Returns `collection`.
     * @example
     *
     * _([1, 2]).forEachRight(function(n) {
     *   console.log(n);
     * }).value();
     * // => logs each value from right to left and returns the array
     */
    var forEachRight = createForEach(arrayEachRight, baseEachRight);

    /**
     * Creates an object composed of keys generated from the results of running
     * each element of `collection` through `iteratee`. The corresponding value
     * of each key is an array of the elements responsible for generating the key.
     * The `iteratee` is bound to `thisArg` and invoked with three arguments:
     * (value, index|key, collection).
     *
     * If a property name is provided for `iteratee` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `iteratee` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function|Object|string} [iteratee=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {Object} Returns the composed aggregate object.
     * @example
     *
     * _.groupBy([4.2, 6.1, 6.4], function(n) {
     *   return Math.floor(n);
     * });
     * // => { '4': [4.2], '6': [6.1, 6.4] }
     *
     * _.groupBy([4.2, 6.1, 6.4], function(n) {
     *   return this.floor(n);
     * }, Math);
     * // => { '4': [4.2], '6': [6.1, 6.4] }
     *
     * // using the `_.property` callback shorthand
     * _.groupBy(['one', 'two', 'three'], 'length');
     * // => { '3': ['one', 'two'], '5': ['three'] }
     */
    var groupBy = createAggregator(function(result, value, key) {
      if (hasOwnProperty.call(result, key)) {
        result[key].push(value);
      } else {
        result[key] = [value];
      }
    });

    /**
     * Checks if `value` is in `collection` using `SameValueZero` for equality
     * comparisons. If `fromIndex` is negative, it is used as the offset from
     * the end of `collection`.
     *
     * **Note:** [`SameValueZero`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
     * comparisons are like strict equality comparisons, e.g. `===`, except that
     * `NaN` matches `NaN`.
     *
     * @static
     * @memberOf _
     * @alias contains, include
     * @category Collection
     * @param {Array|Object|string} collection The collection to search.
     * @param {*} target The value to search for.
     * @param {number} [fromIndex=0] The index to search from.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.reduce`.
     * @returns {boolean} Returns `true` if a matching element is found, else `false`.
     * @example
     *
     * _.includes([1, 2, 3], 1);
     * // => true
     *
     * _.includes([1, 2, 3], 1, 2);
     * // => false
     *
     * _.includes({ 'user': 'fred', 'age': 40 }, 'fred');
     * // => true
     *
     * _.includes('pebbles', 'eb');
     * // => true
     */
    function includes(collection, target, fromIndex, guard) {
      var length = collection ? getLength(collection) : 0;
      if (!isLength(length)) {
        collection = values(collection);
        length = collection.length;
      }
      if (!length) {
        return false;
      }
      if (typeof fromIndex != 'number' || (guard && isIterateeCall(target, fromIndex, guard))) {
        fromIndex = 0;
      } else {
        fromIndex = fromIndex < 0 ? nativeMax(length + fromIndex, 0) : (fromIndex || 0);
      }
      return (typeof collection == 'string' || !isArray(collection) && isString(collection))
        ? (fromIndex < length && collection.indexOf(target, fromIndex) > -1)
        : (getIndexOf(collection, target, fromIndex) > -1);
    }

    /**
     * Creates an object composed of keys generated from the results of running
     * each element of `collection` through `iteratee`. The corresponding value
     * of each key is the last element responsible for generating the key. The
     * iteratee function is bound to `thisArg` and invoked with three arguments:
     * (value, index|key, collection).
     *
     * If a property name is provided for `iteratee` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `iteratee` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function|Object|string} [iteratee=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {Object} Returns the composed aggregate object.
     * @example
     *
     * var keyData = [
     *   { 'dir': 'left', 'code': 97 },
     *   { 'dir': 'right', 'code': 100 }
     * ];
     *
     * _.indexBy(keyData, 'dir');
     * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
     *
     * _.indexBy(keyData, function(object) {
     *   return String.fromCharCode(object.code);
     * });
     * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
     *
     * _.indexBy(keyData, function(object) {
     *   return this.fromCharCode(object.code);
     * }, String);
     * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
     */
    var indexBy = createAggregator(function(result, value, key) {
      result[key] = value;
    });

    /**
     * Invokes the method at `path` on each element in `collection`, returning
     * an array of the results of each invoked method. Any additional arguments
     * are provided to each invoked method. If `methodName` is a function it is
     * invoked for, and `this` bound to, each element in `collection`.
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Array|Function|string} path The path of the method to invoke or
     *  the function invoked per iteration.
     * @param {...*} [args] The arguments to invoke the method with.
     * @returns {Array} Returns the array of results.
     * @example
     *
     * _.invoke([[5, 1, 7], [3, 2, 1]], 'sort');
     * // => [[1, 5, 7], [1, 2, 3]]
     *
     * _.invoke([123, 456], String.prototype.split, '');
     * // => [['1', '2', '3'], ['4', '5', '6']]
     */
    var invoke = restParam(function(collection, path, args) {
      var index = -1,
          isFunc = typeof path == 'function',
          isProp = isKey(path),
          length = getLength(collection),
          result = isLength(length) ? Array(length) : [];

      baseEach(collection, function(value) {
        var func = isFunc ? path : (isProp && value != null && value[path]);
        result[++index] = func ? func.apply(value, args) : invokePath(value, path, args);
      });
      return result;
    });

    /**
     * Creates an array of values by running each element in `collection` through
     * `iteratee`. The `iteratee` is bound to `thisArg` and invoked with three
     * arguments: (value, index|key, collection).
     *
     * If a property name is provided for `iteratee` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `iteratee` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * Many lodash methods are guarded to work as interatees for methods like
     * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
     *
     * The guarded methods are:
     * `ary`, `callback`, `chunk`, `clone`, `create`, `curry`, `curryRight`, `drop`,
     * `dropRight`, `every`, `fill`, `flatten`, `invert`, `max`, `min`, `parseInt`,
     * `slice`, `sortBy`, `take`, `takeRight`, `template`, `trim`, `trimLeft`,
     * `trimRight`, `trunc`, `random`, `range`, `sample`, `some`, `uniq`, and `words`
     *
     * @static
     * @memberOf _
     * @alias collect
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function|Object|string} [iteratee=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {Array} Returns the new mapped array.
     * @example
     *
     * function timesThree(n) {
     *   return n * 3;
     * }
     *
     * _.map([1, 2], timesThree);
     * // => [3, 6]
     *
     * _.map({ 'a': 1, 'b': 2 }, timesThree);
     * // => [3, 6] (iteration order is not guaranteed)
     *
     * var users = [
     *   { 'user': 'barney' },
     *   { 'user': 'fred' }
     * ];
     *
     * // using the `_.property` callback shorthand
     * _.map(users, 'user');
     * // => ['barney', 'fred']
     */
    function map(collection, iteratee, thisArg) {
      var func = isArray(collection) ? arrayMap : baseMap;
      iteratee = getCallback(iteratee, thisArg, 3);
      return func(collection, iteratee);
    }

    /**
     * Creates an array of elements split into two groups, the first of which
     * contains elements `predicate` returns truthy for, while the second of which
     * contains elements `predicate` returns falsey for. The predicate is bound
     * to `thisArg` and invoked with three arguments: (value, index|key, collection).
     *
     * If a property name is provided for `predicate` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `predicate` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function|Object|string} [predicate=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {Array} Returns the array of grouped elements.
     * @example
     *
     * _.partition([1, 2, 3], function(n) {
     *   return n % 2;
     * });
     * // => [[1, 3], [2]]
     *
     * _.partition([1.2, 2.3, 3.4], function(n) {
     *   return this.floor(n) % 2;
     * }, Math);
     * // => [[1.2, 3.4], [2.3]]
     *
     * var users = [
     *   { 'user': 'barney',  'age': 36, 'active': false },
     *   { 'user': 'fred',    'age': 40, 'active': true },
     *   { 'user': 'pebbles', 'age': 1,  'active': false }
     * ];
     *
     * var mapper = function(array) {
     *   return _.pluck(array, 'user');
     * };
     *
     * // using the `_.matches` callback shorthand
     * _.map(_.partition(users, { 'age': 1, 'active': false }), mapper);
     * // => [['pebbles'], ['barney', 'fred']]
     *
     * // using the `_.matchesProperty` callback shorthand
     * _.map(_.partition(users, 'active', false), mapper);
     * // => [['barney', 'pebbles'], ['fred']]
     *
     * // using the `_.property` callback shorthand
     * _.map(_.partition(users, 'active'), mapper);
     * // => [['fred'], ['barney', 'pebbles']]
     */
    var partition = createAggregator(function(result, value, key) {
      result[key ? 0 : 1].push(value);
    }, function() { return [[], []]; });

    /**
     * Gets the property value of `path` from all elements in `collection`.
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Array|string} path The path of the property to pluck.
     * @returns {Array} Returns the property values.
     * @example
     *
     * var users = [
     *   { 'user': 'barney', 'age': 36 },
     *   { 'user': 'fred',   'age': 40 }
     * ];
     *
     * _.pluck(users, 'user');
     * // => ['barney', 'fred']
     *
     * var userIndex = _.indexBy(users, 'user');
     * _.pluck(userIndex, 'age');
     * // => [36, 40] (iteration order is not guaranteed)
     */
    function pluck(collection, path) {
      return map(collection, property(path));
    }

    /**
     * Reduces `collection` to a value which is the accumulated result of running
     * each element in `collection` through `iteratee`, where each successive
     * invocation is supplied the return value of the previous. If `accumulator`
     * is not provided the first element of `collection` is used as the initial
     * value. The `iteratee` is bound to `thisArg` and invoked with four arguments:
     * (accumulator, value, index|key, collection).
     *
     * Many lodash methods are guarded to work as interatees for methods like
     * `_.reduce`, `_.reduceRight`, and `_.transform`.
     *
     * The guarded methods are:
     * `assign`, `defaults`, `includes`, `merge`, `sortByAll`, and `sortByOrder`
     *
     * @static
     * @memberOf _
     * @alias foldl, inject
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {*} [accumulator] The initial value.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {*} Returns the accumulated value.
     * @example
     *
     * _.reduce([1, 2], function(total, n) {
     *   return total + n;
     * });
     * // => 3
     *
     * _.reduce({ 'a': 1, 'b': 2 }, function(result, n, key) {
     *   result[key] = n * 3;
     *   return result;
     * }, {});
     * // => { 'a': 3, 'b': 6 } (iteration order is not guaranteed)
     */
    var reduce = createReduce(arrayReduce, baseEach);

    /**
     * This method is like `_.reduce` except that it iterates over elements of
     * `collection` from right to left.
     *
     * @static
     * @memberOf _
     * @alias foldr
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {*} [accumulator] The initial value.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {*} Returns the accumulated value.
     * @example
     *
     * var array = [[0, 1], [2, 3], [4, 5]];
     *
     * _.reduceRight(array, function(flattened, other) {
     *   return flattened.concat(other);
     * }, []);
     * // => [4, 5, 2, 3, 0, 1]
     */
    var reduceRight =  createReduce(arrayReduceRight, baseEachRight);

    /**
     * The opposite of `_.filter`; this method returns the elements of `collection`
     * that `predicate` does **not** return truthy for.
     *
     * If a property name is provided for `predicate` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `predicate` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function|Object|string} [predicate=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {Array} Returns the new filtered array.
     * @example
     *
     * _.reject([1, 2, 3, 4], function(n) {
     *   return n % 2 == 0;
     * });
     * // => [1, 3]
     *
     * var users = [
     *   { 'user': 'barney', 'age': 36, 'active': false },
     *   { 'user': 'fred',   'age': 40, 'active': true }
     * ];
     *
     * // using the `_.matches` callback shorthand
     * _.pluck(_.reject(users, { 'age': 40, 'active': true }), 'user');
     * // => ['barney']
     *
     * // using the `_.matchesProperty` callback shorthand
     * _.pluck(_.reject(users, 'active', false), 'user');
     * // => ['fred']
     *
     * // using the `_.property` callback shorthand
     * _.pluck(_.reject(users, 'active'), 'user');
     * // => ['barney']
     */
    function reject(collection, predicate, thisArg) {
      var func = isArray(collection) ? arrayFilter : baseFilter;
      predicate = getCallback(predicate, thisArg, 3);
      return func(collection, function(value, index, collection) {
        return !predicate(value, index, collection);
      });
    }

    /**
     * Gets a random element or `n` random elements from a collection.
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to sample.
     * @param {number} [n] The number of elements to sample.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {*} Returns the random sample(s).
     * @example
     *
     * _.sample([1, 2, 3, 4]);
     * // => 2
     *
     * _.sample([1, 2, 3, 4], 2);
     * // => [3, 1]
     */
    function sample(collection, n, guard) {
      if (guard ? isIterateeCall(collection, n, guard) : n == null) {
        collection = toIterable(collection);
        var length = collection.length;
        return length > 0 ? collection[baseRandom(0, length - 1)] : undefined;
      }
      var result = shuffle(collection);
      result.length = nativeMin(n < 0 ? 0 : (+n || 0), result.length);
      return result;
    }

    /**
     * Creates an array of shuffled values, using a version of the
     * [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to shuffle.
     * @returns {Array} Returns the new shuffled array.
     * @example
     *
     * _.shuffle([1, 2, 3, 4]);
     * // => [4, 1, 3, 2]
     */
    function shuffle(collection) {
      collection = toIterable(collection);

      var index = -1,
          length = collection.length,
          result = Array(length);

      while (++index < length) {
        var rand = baseRandom(0, index);
        if (index != rand) {
          result[index] = result[rand];
        }
        result[rand] = collection[index];
      }
      return result;
    }

    /**
     * Gets the size of `collection` by returning its length for array-like
     * values or the number of own enumerable properties for objects.
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to inspect.
     * @returns {number} Returns the size of `collection`.
     * @example
     *
     * _.size([1, 2, 3]);
     * // => 3
     *
     * _.size({ 'a': 1, 'b': 2 });
     * // => 2
     *
     * _.size('pebbles');
     * // => 7
     */
    function size(collection) {
      var length = collection ? getLength(collection) : 0;
      return isLength(length) ? length : keys(collection).length;
    }

    /**
     * Checks if `predicate` returns truthy for **any** element of `collection`.
     * The function returns as soon as it finds a passing value and does not iterate
     * over the entire collection. The predicate is bound to `thisArg` and invoked
     * with three arguments: (value, index|key, collection).
     *
     * If a property name is provided for `predicate` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `predicate` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @alias any
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function|Object|string} [predicate=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {boolean} Returns `true` if any element passes the predicate check,
     *  else `false`.
     * @example
     *
     * _.some([null, 0, 'yes', false], Boolean);
     * // => true
     *
     * var users = [
     *   { 'user': 'barney', 'active': true },
     *   { 'user': 'fred',   'active': false }
     * ];
     *
     * // using the `_.matches` callback shorthand
     * _.some(users, { 'user': 'barney', 'active': false });
     * // => false
     *
     * // using the `_.matchesProperty` callback shorthand
     * _.some(users, 'active', false);
     * // => true
     *
     * // using the `_.property` callback shorthand
     * _.some(users, 'active');
     * // => true
     */
    function some(collection, predicate, thisArg) {
      var func = isArray(collection) ? arraySome : baseSome;
      if (thisArg && isIterateeCall(collection, predicate, thisArg)) {
        predicate = null;
      }
      if (typeof predicate != 'function' || thisArg !== undefined) {
        predicate = getCallback(predicate, thisArg, 3);
      }
      return func(collection, predicate);
    }

    /**
     * Creates an array of elements, sorted in ascending order by the results of
     * running each element in a collection through `iteratee`. This method performs
     * a stable sort, that is, it preserves the original sort order of equal elements.
     * The `iteratee` is bound to `thisArg` and invoked with three arguments:
     * (value, index|key, collection).
     *
     * If a property name is provided for `iteratee` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `iteratee` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function|Object|string} [iteratee=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {Array} Returns the new sorted array.
     * @example
     *
     * _.sortBy([1, 2, 3], function(n) {
     *   return Math.sin(n);
     * });
     * // => [3, 1, 2]
     *
     * _.sortBy([1, 2, 3], function(n) {
     *   return this.sin(n);
     * }, Math);
     * // => [3, 1, 2]
     *
     * var users = [
     *   { 'user': 'fred' },
     *   { 'user': 'pebbles' },
     *   { 'user': 'barney' }
     * ];
     *
     * // using the `_.property` callback shorthand
     * _.pluck(_.sortBy(users, 'user'), 'user');
     * // => ['barney', 'fred', 'pebbles']
     */
    function sortBy(collection, iteratee, thisArg) {
      if (collection == null) {
        return [];
      }
      if (thisArg && isIterateeCall(collection, iteratee, thisArg)) {
        iteratee = null;
      }
      var index = -1;
      iteratee = getCallback(iteratee, thisArg, 3);

      var result = baseMap(collection, function(value, key, collection) {
        return { 'criteria': iteratee(value, key, collection), 'index': ++index, 'value': value };
      });
      return baseSortBy(result, compareAscending);
    }

    /**
     * This method is like `_.sortBy` except that it can sort by multiple iteratees
     * or property names.
     *
     * If a property name is provided for an iteratee the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If an object is provided for an iteratee the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {...(Function|Function[]|Object|Object[]|string|string[])} iteratees
     *  The iteratees to sort by, specified as individual values or arrays of values.
     * @returns {Array} Returns the new sorted array.
     * @example
     *
     * var users = [
     *   { 'user': 'fred',   'age': 48 },
     *   { 'user': 'barney', 'age': 36 },
     *   { 'user': 'fred',   'age': 42 },
     *   { 'user': 'barney', 'age': 34 }
     * ];
     *
     * _.map(_.sortByAll(users, ['user', 'age']), _.values);
     * // => [['barney', 34], ['barney', 36], ['fred', 42], ['fred', 48]]
     *
     * _.map(_.sortByAll(users, 'user', function(chr) {
     *   return Math.floor(chr.age / 10);
     * }), _.values);
     * // => [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 42]]
     */
    var sortByAll = restParam(function(collection, iteratees) {
      if (collection == null) {
        return [];
      }
      var guard = iteratees[2];
      if (guard && isIterateeCall(iteratees[0], iteratees[1], guard)) {
        iteratees.length = 1;
      }
      return baseSortByOrder(collection, baseFlatten(iteratees), []);
    });

    /**
     * This method is like `_.sortByAll` except that it allows specifying the
     * sort orders of the iteratees to sort by. A truthy value in `orders` will
     * sort the corresponding property name in ascending order while a falsey
     * value will sort it in descending order.
     *
     * If a property name is provided for an iteratee the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If an object is provided for an iteratee the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.
     * @param {boolean[]} orders The sort orders of `iteratees`.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.reduce`.
     * @returns {Array} Returns the new sorted array.
     * @example
     *
     * var users = [
     *   { 'user': 'fred',   'age': 48 },
     *   { 'user': 'barney', 'age': 34 },
     *   { 'user': 'fred',   'age': 42 },
     *   { 'user': 'barney', 'age': 36 }
     * ];
     *
     * // sort by `user` in ascending order and by `age` in descending order
     * _.map(_.sortByOrder(users, ['user', 'age'], [true, false]), _.values);
     * // => [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 42]]
     */
    function sortByOrder(collection, iteratees, orders, guard) {
      if (collection == null) {
        return [];
      }
      if (guard && isIterateeCall(iteratees, orders, guard)) {
        orders = null;
      }
      if (!isArray(iteratees)) {
        iteratees = iteratees == null ? [] : [iteratees];
      }
      if (!isArray(orders)) {
        orders = orders == null ? [] : [orders];
      }
      return baseSortByOrder(collection, iteratees, orders);
    }

    /**
     * Performs a deep comparison between each element in `collection` and the
     * source object, returning an array of all elements that have equivalent
     * property values.
     *
     * **Note:** This method supports comparing arrays, booleans, `Date` objects,
     * numbers, `Object` objects, regexes, and strings. Objects are compared by
     * their own, not inherited, enumerable properties. For comparing a single
     * own or inherited property value see `_.matchesProperty`.
     *
     * @static
     * @memberOf _
     * @category Collection
     * @param {Array|Object|string} collection The collection to search.
     * @param {Object} source The object of property values to match.
     * @returns {Array} Returns the new filtered array.
     * @example
     *
     * var users = [
     *   { 'user': 'barney', 'age': 36, 'active': false, 'pets': ['hoppy'] },
     *   { 'user': 'fred',   'age': 40, 'active': true, 'pets': ['baby puss', 'dino'] }
     * ];
     *
     * _.pluck(_.where(users, { 'age': 36, 'active': false }), 'user');
     * // => ['barney']
     *
     * _.pluck(_.where(users, { 'pets': ['dino'] }), 'user');
     * // => ['fred']
     */
    function where(collection, source) {
      return filter(collection, baseMatches(source));
    }

    /*------------------------------------------------------------------------*/

    /**
     * Gets the number of milliseconds that have elapsed since the Unix epoch
     * (1 January 1970 00:00:00 UTC).
     *
     * @static
     * @memberOf _
     * @category Date
     * @example
     *
     * _.defer(function(stamp) {
     *   console.log(_.now() - stamp);
     * }, _.now());
     * // => logs the number of milliseconds it took for the deferred function to be invoked
     */
    var now = nativeNow || function() {
      return new Date().getTime();
    };

    /*------------------------------------------------------------------------*/

    /**
     * The opposite of `_.before`; this method creates a function that invokes
     * `func` once it is called `n` or more times.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {number} n The number of calls before `func` is invoked.
     * @param {Function} func The function to restrict.
     * @returns {Function} Returns the new restricted function.
     * @example
     *
     * var saves = ['profile', 'settings'];
     *
     * var done = _.after(saves.length, function() {
     *   console.log('done saving!');
     * });
     *
     * _.forEach(saves, function(type) {
     *   asyncSave({ 'type': type, 'complete': done });
     * });
     * // => logs 'done saving!' after the two async saves have completed
     */
    function after(n, func) {
      if (typeof func != 'function') {
        if (typeof n == 'function') {
          var temp = n;
          n = func;
          func = temp;
        } else {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
      }
      n = nativeIsFinite(n = +n) ? n : 0;
      return function() {
        if (--n < 1) {
          return func.apply(this, arguments);
        }
      };
    }

    /**
     * Creates a function that accepts up to `n` arguments ignoring any
     * additional arguments.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Function} func The function to cap arguments for.
     * @param {number} [n=func.length] The arity cap.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {Function} Returns the new function.
     * @example
     *
     * _.map(['6', '8', '10'], _.ary(parseInt, 1));
     * // => [6, 8, 10]
     */
    function ary(func, n, guard) {
      if (guard && isIterateeCall(func, n, guard)) {
        n = null;
      }
      n = (func && n == null) ? func.length : nativeMax(+n || 0, 0);
      return createWrapper(func, ARY_FLAG, null, null, null, null, n);
    }

    /**
     * Creates a function that invokes `func`, with the `this` binding and arguments
     * of the created function, while it is called less than `n` times. Subsequent
     * calls to the created function return the result of the last `func` invocation.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {number} n The number of calls at which `func` is no longer invoked.
     * @param {Function} func The function to restrict.
     * @returns {Function} Returns the new restricted function.
     * @example
     *
     * jQuery('#add').on('click', _.before(5, addContactToList));
     * // => allows adding up to 4 contacts to the list
     */
    function before(n, func) {
      var result;
      if (typeof func != 'function') {
        if (typeof n == 'function') {
          var temp = n;
          n = func;
          func = temp;
        } else {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
      }
      return function() {
        if (--n > 0) {
          result = func.apply(this, arguments);
        }
        if (n <= 1) {
          func = null;
        }
        return result;
      };
    }

    /**
     * Creates a function that invokes `func` with the `this` binding of `thisArg`
     * and prepends any additional `_.bind` arguments to those provided to the
     * bound function.
     *
     * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
     * may be used as a placeholder for partially applied arguments.
     *
     * **Note:** Unlike native `Function#bind` this method does not set the "length"
     * property of bound functions.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Function} func The function to bind.
     * @param {*} thisArg The `this` binding of `func`.
     * @param {...*} [partials] The arguments to be partially applied.
     * @returns {Function} Returns the new bound function.
     * @example
     *
     * var greet = function(greeting, punctuation) {
     *   return greeting + ' ' + this.user + punctuation;
     * };
     *
     * var object = { 'user': 'fred' };
     *
     * var bound = _.bind(greet, object, 'hi');
     * bound('!');
     * // => 'hi fred!'
     *
     * // using placeholders
     * var bound = _.bind(greet, object, _, '!');
     * bound('hi');
     * // => 'hi fred!'
     */
    var bind = restParam(function(func, thisArg, partials) {
      var bitmask = BIND_FLAG;
      if (partials.length) {
        var holders = replaceHolders(partials, bind.placeholder);
        bitmask |= PARTIAL_FLAG;
      }
      return createWrapper(func, bitmask, thisArg, partials, holders);
    });

    /**
     * Binds methods of an object to the object itself, overwriting the existing
     * method. Method names may be specified as individual arguments or as arrays
     * of method names. If no method names are provided all enumerable function
     * properties, own and inherited, of `object` are bound.
     *
     * **Note:** This method does not set the "length" property of bound functions.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Object} object The object to bind and assign the bound methods to.
     * @param {...(string|string[])} [methodNames] The object method names to bind,
     *  specified as individual method names or arrays of method names.
     * @returns {Object} Returns `object`.
     * @example
     *
     * var view = {
     *   'label': 'docs',
     *   'onClick': function() {
     *     console.log('clicked ' + this.label);
     *   }
     * };
     *
     * _.bindAll(view);
     * jQuery('#docs').on('click', view.onClick);
     * // => logs 'clicked docs' when the element is clicked
     */
    var bindAll = restParam(function(object, methodNames) {
      methodNames = methodNames.length ? baseFlatten(methodNames) : functions(object);

      var index = -1,
          length = methodNames.length;

      while (++index < length) {
        var key = methodNames[index];
        object[key] = createWrapper(object[key], BIND_FLAG, object);
      }
      return object;
    });

    /**
     * Creates a function that invokes the method at `object[key]` and prepends
     * any additional `_.bindKey` arguments to those provided to the bound function.
     *
     * This method differs from `_.bind` by allowing bound functions to reference
     * methods that may be redefined or don't yet exist.
     * See [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern)
     * for more details.
     *
     * The `_.bindKey.placeholder` value, which defaults to `_` in monolithic
     * builds, may be used as a placeholder for partially applied arguments.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Object} object The object the method belongs to.
     * @param {string} key The key of the method.
     * @param {...*} [partials] The arguments to be partially applied.
     * @returns {Function} Returns the new bound function.
     * @example
     *
     * var object = {
     *   'user': 'fred',
     *   'greet': function(greeting, punctuation) {
     *     return greeting + ' ' + this.user + punctuation;
     *   }
     * };
     *
     * var bound = _.bindKey(object, 'greet', 'hi');
     * bound('!');
     * // => 'hi fred!'
     *
     * object.greet = function(greeting, punctuation) {
     *   return greeting + 'ya ' + this.user + punctuation;
     * };
     *
     * bound('!');
     * // => 'hiya fred!'
     *
     * // using placeholders
     * var bound = _.bindKey(object, 'greet', _, '!');
     * bound('hi');
     * // => 'hiya fred!'
     */
    var bindKey = restParam(function(object, key, partials) {
      var bitmask = BIND_FLAG | BIND_KEY_FLAG;
      if (partials.length) {
        var holders = replaceHolders(partials, bindKey.placeholder);
        bitmask |= PARTIAL_FLAG;
      }
      return createWrapper(key, bitmask, object, partials, holders);
    });

    /**
     * Creates a function that accepts one or more arguments of `func` that when
     * called either invokes `func` returning its result, if all `func` arguments
     * have been provided, or returns a function that accepts one or more of the
     * remaining `func` arguments, and so on. The arity of `func` may be specified
     * if `func.length` is not sufficient.
     *
     * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
     * may be used as a placeholder for provided arguments.
     *
     * **Note:** This method does not set the "length" property of curried functions.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Function} func The function to curry.
     * @param {number} [arity=func.length] The arity of `func`.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {Function} Returns the new curried function.
     * @example
     *
     * var abc = function(a, b, c) {
     *   return [a, b, c];
     * };
     *
     * var curried = _.curry(abc);
     *
     * curried(1)(2)(3);
     * // => [1, 2, 3]
     *
     * curried(1, 2)(3);
     * // => [1, 2, 3]
     *
     * curried(1, 2, 3);
     * // => [1, 2, 3]
     *
     * // using placeholders
     * curried(1)(_, 3)(2);
     * // => [1, 2, 3]
     */
    var curry = createCurry(CURRY_FLAG);

    /**
     * This method is like `_.curry` except that arguments are applied to `func`
     * in the manner of `_.partialRight` instead of `_.partial`.
     *
     * The `_.curryRight.placeholder` value, which defaults to `_` in monolithic
     * builds, may be used as a placeholder for provided arguments.
     *
     * **Note:** This method does not set the "length" property of curried functions.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Function} func The function to curry.
     * @param {number} [arity=func.length] The arity of `func`.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {Function} Returns the new curried function.
     * @example
     *
     * var abc = function(a, b, c) {
     *   return [a, b, c];
     * };
     *
     * var curried = _.curryRight(abc);
     *
     * curried(3)(2)(1);
     * // => [1, 2, 3]
     *
     * curried(2, 3)(1);
     * // => [1, 2, 3]
     *
     * curried(1, 2, 3);
     * // => [1, 2, 3]
     *
     * // using placeholders
     * curried(3)(1, _)(2);
     * // => [1, 2, 3]
     */
    var curryRight = createCurry(CURRY_RIGHT_FLAG);

    /**
     * Creates a function that delays invoking `func` until after `wait` milliseconds
     * have elapsed since the last time it was invoked. The created function comes
     * with a `cancel` method to cancel delayed invocations. Provide an options
     * object to indicate that `func` should be invoked on the leading and/or
     * trailing edge of the `wait` timeout. Subsequent calls to the debounced
     * function return the result of the last `func` invocation.
     *
     * **Note:** If `leading` and `trailing` options are `true`, `func` is invoked
     * on the trailing edge of the timeout only if the the debounced function is
     * invoked more than once during the `wait` timeout.
     *
     * See [David Corbacho's article](http://drupalmotion.com/article/debounce-and-throttle-visual-explanation)
     * for details over the differences between `_.debounce` and `_.throttle`.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Function} func The function to debounce.
     * @param {number} [wait=0] The number of milliseconds to delay.
     * @param {Object} [options] The options object.
     * @param {boolean} [options.leading=false] Specify invoking on the leading
     *  edge of the timeout.
     * @param {number} [options.maxWait] The maximum time `func` is allowed to be
     *  delayed before it is invoked.
     * @param {boolean} [options.trailing=true] Specify invoking on the trailing
     *  edge of the timeout.
     * @returns {Function} Returns the new debounced function.
     * @example
     *
     * // avoid costly calculations while the window size is in flux
     * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
     *
     * // invoke `sendMail` when the click event is fired, debouncing subsequent calls
     * jQuery('#postbox').on('click', _.debounce(sendMail, 300, {
     *   'leading': true,
     *   'trailing': false
     * }));
     *
     * // ensure `batchLog` is invoked once after 1 second of debounced calls
     * var source = new EventSource('/stream');
     * jQuery(source).on('message', _.debounce(batchLog, 250, {
     *   'maxWait': 1000
     * }));
     *
     * // cancel a debounced call
     * var todoChanges = _.debounce(batchLog, 1000);
     * Object.observe(models.todo, todoChanges);
     *
     * Object.observe(models, function(changes) {
     *   if (_.find(changes, { 'user': 'todo', 'type': 'delete'})) {
     *     todoChanges.cancel();
     *   }
     * }, ['delete']);
     *
     * // ...at some point `models.todo` is changed
     * models.todo.completed = true;
     *
     * // ...before 1 second has passed `models.todo` is deleted
     * // which cancels the debounced `todoChanges` call
     * delete models.todo;
     */
    function debounce(func, wait, options) {
      var args,
          maxTimeoutId,
          result,
          stamp,
          thisArg,
          timeoutId,
          trailingCall,
          lastCalled = 0,
          maxWait = false,
          trailing = true;

      if (typeof func != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      wait = wait < 0 ? 0 : (+wait || 0);
      if (options === true) {
        var leading = true;
        trailing = false;
      } else if (isObject(options)) {
        leading = options.leading;
        maxWait = 'maxWait' in options && nativeMax(+options.maxWait || 0, wait);
        trailing = 'trailing' in options ? options.trailing : trailing;
      }

      function cancel() {
        if (timeoutId) {
          clearTimeout(timeoutId);
        }
        if (maxTimeoutId) {
          clearTimeout(maxTimeoutId);
        }
        maxTimeoutId = timeoutId = trailingCall = undefined;
      }

      function delayed() {
        var remaining = wait - (now() - stamp);
        if (remaining <= 0 || remaining > wait) {
          if (maxTimeoutId) {
            clearTimeout(maxTimeoutId);
          }
          var isCalled = trailingCall;
          maxTimeoutId = timeoutId = trailingCall = undefined;
          if (isCalled) {
            lastCalled = now();
            result = func.apply(thisArg, args);
            if (!timeoutId && !maxTimeoutId) {
              args = thisArg = null;
            }
          }
        } else {
          timeoutId = setTimeout(delayed, remaining);
        }
      }

      function maxDelayed() {
        if (timeoutId) {
          clearTimeout(timeoutId);
        }
        maxTimeoutId = timeoutId = trailingCall = undefined;
        if (trailing || (maxWait !== wait)) {
          lastCalled = now();
          result = func.apply(thisArg, args);
          if (!timeoutId && !maxTimeoutId) {
            args = thisArg = null;
          }
        }
      }

      function debounced() {
        args = arguments;
        stamp = now();
        thisArg = this;
        trailingCall = trailing && (timeoutId || !leading);

        if (maxWait === false) {
          var leadingCall = leading && !timeoutId;
        } else {
          if (!maxTimeoutId && !leading) {
            lastCalled = stamp;
          }
          var remaining = maxWait - (stamp - lastCalled),
              isCalled = remaining <= 0 || remaining > maxWait;

          if (isCalled) {
            if (maxTimeoutId) {
              maxTimeoutId = clearTimeout(maxTimeoutId);
            }
            lastCalled = stamp;
            result = func.apply(thisArg, args);
          }
          else if (!maxTimeoutId) {
            maxTimeoutId = setTimeout(maxDelayed, remaining);
          }
        }
        if (isCalled && timeoutId) {
          timeoutId = clearTimeout(timeoutId);
        }
        else if (!timeoutId && wait !== maxWait) {
          timeoutId = setTimeout(delayed, wait);
        }
        if (leadingCall) {
          isCalled = true;
          result = func.apply(thisArg, args);
        }
        if (isCalled && !timeoutId && !maxTimeoutId) {
          args = thisArg = null;
        }
        return result;
      }
      debounced.cancel = cancel;
      return debounced;
    }

    /**
     * Defers invoking the `func` until the current call stack has cleared. Any
     * additional arguments are provided to `func` when it is invoked.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Function} func The function to defer.
     * @param {...*} [args] The arguments to invoke the function with.
     * @returns {number} Returns the timer id.
     * @example
     *
     * _.defer(function(text) {
     *   console.log(text);
     * }, 'deferred');
     * // logs 'deferred' after one or more milliseconds
     */
    var defer = restParam(function(func, args) {
      return baseDelay(func, 1, args);
    });

    /**
     * Invokes `func` after `wait` milliseconds. Any additional arguments are
     * provided to `func` when it is invoked.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Function} func The function to delay.
     * @param {number} wait The number of milliseconds to delay invocation.
     * @param {...*} [args] The arguments to invoke the function with.
     * @returns {number} Returns the timer id.
     * @example
     *
     * _.delay(function(text) {
     *   console.log(text);
     * }, 1000, 'later');
     * // => logs 'later' after one second
     */
    var delay = restParam(function(func, wait, args) {
      return baseDelay(func, wait, args);
    });

    /**
     * Creates a function that returns the result of invoking the provided
     * functions with the `this` binding of the created function, where each
     * successive invocation is supplied the return value of the previous.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {...Function} [funcs] Functions to invoke.
     * @returns {Function} Returns the new function.
     * @example
     *
     * function square(n) {
     *   return n * n;
     * }
     *
     * var addSquare = _.flow(_.add, square);
     * addSquare(1, 2);
     * // => 9
     */
    var flow = createFlow();

    /**
     * This method is like `_.flow` except that it creates a function that
     * invokes the provided functions from right to left.
     *
     * @static
     * @memberOf _
     * @alias backflow, compose
     * @category Function
     * @param {...Function} [funcs] Functions to invoke.
     * @returns {Function} Returns the new function.
     * @example
     *
     * function square(n) {
     *   return n * n;
     * }
     *
     * var addSquare = _.flowRight(square, _.add);
     * addSquare(1, 2);
     * // => 9
     */
    var flowRight = createFlow(true);

    /**
     * Creates a function that memoizes the result of `func`. If `resolver` is
     * provided it determines the cache key for storing the result based on the
     * arguments provided to the memoized function. By default, the first argument
     * provided to the memoized function is coerced to a string and used as the
     * cache key. The `func` is invoked with the `this` binding of the memoized
     * function.
     *
     * **Note:** The cache is exposed as the `cache` property on the memoized
     * function. Its creation may be customized by replacing the `_.memoize.Cache`
     * constructor with one whose instances implement the [`Map`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-properties-of-the-map-prototype-object)
     * method interface of `get`, `has`, and `set`.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Function} func The function to have its output memoized.
     * @param {Function} [resolver] The function to resolve the cache key.
     * @returns {Function} Returns the new memoizing function.
     * @example
     *
     * var upperCase = _.memoize(function(string) {
     *   return string.toUpperCase();
     * });
     *
     * upperCase('fred');
     * // => 'FRED'
     *
     * // modifying the result cache
     * upperCase.cache.set('fred', 'BARNEY');
     * upperCase('fred');
     * // => 'BARNEY'
     *
     * // replacing `_.memoize.Cache`
     * var object = { 'user': 'fred' };
     * var other = { 'user': 'barney' };
     * var identity = _.memoize(_.identity);
     *
     * identity(object);
     * // => { 'user': 'fred' }
     * identity(other);
     * // => { 'user': 'fred' }
     *
     * _.memoize.Cache = WeakMap;
     * var identity = _.memoize(_.identity);
     *
     * identity(object);
     * // => { 'user': 'fred' }
     * identity(other);
     * // => { 'user': 'barney' }
     */
    function memoize(func, resolver) {
      if (typeof func != 'function' || (resolver && typeof resolver != 'function')) {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      var memoized = function() {
        var args = arguments,
            cache = memoized.cache,
            key = resolver ? resolver.apply(this, args) : args[0];

        if (cache.has(key)) {
          return cache.get(key);
        }
        var result = func.apply(this, args);
        cache.set(key, result);
        return result;
      };
      memoized.cache = new memoize.Cache;
      return memoized;
    }

    /**
     * Creates a function that negates the result of the predicate `func`. The
     * `func` predicate is invoked with the `this` binding and arguments of the
     * created function.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Function} predicate The predicate to negate.
     * @returns {Function} Returns the new function.
     * @example
     *
     * function isEven(n) {
     *   return n % 2 == 0;
     * }
     *
     * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
     * // => [1, 3, 5]
     */
    function negate(predicate) {
      if (typeof predicate != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      return function() {
        return !predicate.apply(this, arguments);
      };
    }

    /**
     * Creates a function that is restricted to invoking `func` once. Repeat calls
     * to the function return the value of the first call. The `func` is invoked
     * with the `this` binding and arguments of the created function.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Function} func The function to restrict.
     * @returns {Function} Returns the new restricted function.
     * @example
     *
     * var initialize = _.once(createApplication);
     * initialize();
     * initialize();
     * // `initialize` invokes `createApplication` once
     */
    function once(func) {
      return before(2, func);
    }

    /**
     * Creates a function that invokes `func` with `partial` arguments prepended
     * to those provided to the new function. This method is like `_.bind` except
     * it does **not** alter the `this` binding.
     *
     * The `_.partial.placeholder` value, which defaults to `_` in monolithic
     * builds, may be used as a placeholder for partially applied arguments.
     *
     * **Note:** This method does not set the "length" property of partially
     * applied functions.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Function} func The function to partially apply arguments to.
     * @param {...*} [partials] The arguments to be partially applied.
     * @returns {Function} Returns the new partially applied function.
     * @example
     *
     * var greet = function(greeting, name) {
     *   return greeting + ' ' + name;
     * };
     *
     * var sayHelloTo = _.partial(greet, 'hello');
     * sayHelloTo('fred');
     * // => 'hello fred'
     *
     * // using placeholders
     * var greetFred = _.partial(greet, _, 'fred');
     * greetFred('hi');
     * // => 'hi fred'
     */
    var partial = createPartial(PARTIAL_FLAG);

    /**
     * This method is like `_.partial` except that partially applied arguments
     * are appended to those provided to the new function.
     *
     * The `_.partialRight.placeholder` value, which defaults to `_` in monolithic
     * builds, may be used as a placeholder for partially applied arguments.
     *
     * **Note:** This method does not set the "length" property of partially
     * applied functions.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Function} func The function to partially apply arguments to.
     * @param {...*} [partials] The arguments to be partially applied.
     * @returns {Function} Returns the new partially applied function.
     * @example
     *
     * var greet = function(greeting, name) {
     *   return greeting + ' ' + name;
     * };
     *
     * var greetFred = _.partialRight(greet, 'fred');
     * greetFred('hi');
     * // => 'hi fred'
     *
     * // using placeholders
     * var sayHelloTo = _.partialRight(greet, 'hello', _);
     * sayHelloTo('fred');
     * // => 'hello fred'
     */
    var partialRight = createPartial(PARTIAL_RIGHT_FLAG);

    /**
     * Creates a function that invokes `func` with arguments arranged according
     * to the specified indexes where the argument value at the first index is
     * provided as the first argument, the argument value at the second index is
     * provided as the second argument, and so on.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Function} func The function to rearrange arguments for.
     * @param {...(number|number[])} indexes The arranged argument indexes,
     *  specified as individual indexes or arrays of indexes.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var rearged = _.rearg(function(a, b, c) {
     *   return [a, b, c];
     * }, 2, 0, 1);
     *
     * rearged('b', 'c', 'a')
     * // => ['a', 'b', 'c']
     *
     * var map = _.rearg(_.map, [1, 0]);
     * map(function(n) {
     *   return n * 3;
     * }, [1, 2, 3]);
     * // => [3, 6, 9]
     */
    var rearg = restParam(function(func, indexes) {
      return createWrapper(func, REARG_FLAG, null, null, null, baseFlatten(indexes));
    });

    /**
     * Creates a function that invokes `func` with the `this` binding of the
     * created function and arguments from `start` and beyond provided as an array.
     *
     * **Note:** This method is based on the [rest parameter](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters).
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Function} func The function to apply a rest parameter to.
     * @param {number} [start=func.length-1] The start position of the rest parameter.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var say = _.restParam(function(what, names) {
     *   return what + ' ' + _.initial(names).join(', ') +
     *     (_.size(names) > 1 ? ', & ' : '') + _.last(names);
     * });
     *
     * say('hello', 'fred', 'barney', 'pebbles');
     * // => 'hello fred, barney, & pebbles'
     */
    function restParam(func, start) {
      if (typeof func != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      start = nativeMax(start === undefined ? (func.length - 1) : (+start || 0), 0);
      return function() {
        var args = arguments,
            index = -1,
            length = nativeMax(args.length - start, 0),
            rest = Array(length);

        while (++index < length) {
          rest[index] = args[start + index];
        }
        switch (start) {
          case 0: return func.call(this, rest);
          case 1: return func.call(this, args[0], rest);
          case 2: return func.call(this, args[0], args[1], rest);
        }
        var otherArgs = Array(start + 1);
        index = -1;
        while (++index < start) {
          otherArgs[index] = args[index];
        }
        otherArgs[start] = rest;
        return func.apply(this, otherArgs);
      };
    }

    /**
     * Creates a function that invokes `func` with the `this` binding of the created
     * function and an array of arguments much like [`Function#apply`](https://es5.github.io/#x15.3.4.3).
     *
     * **Note:** This method is based on the [spread operator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator).
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Function} func The function to spread arguments over.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var say = _.spread(function(who, what) {
     *   return who + ' says ' + what;
     * });
     *
     * say(['fred', 'hello']);
     * // => 'fred says hello'
     *
     * // with a Promise
     * var numbers = Promise.all([
     *   Promise.resolve(40),
     *   Promise.resolve(36)
     * ]);
     *
     * numbers.then(_.spread(function(x, y) {
     *   return x + y;
     * }));
     * // => a Promise of 76
     */
    function spread(func) {
      if (typeof func != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      return function(array) {
        return func.apply(this, array);
      };
    }

    /**
     * Creates a function that only invokes `func` at most once per every `wait`
     * milliseconds. The created function comes with a `cancel` method to cancel
     * delayed invocations. Provide an options object to indicate that `func`
     * should be invoked on the leading and/or trailing edge of the `wait` timeout.
     * Subsequent calls to the throttled function return the result of the last
     * `func` call.
     *
     * **Note:** If `leading` and `trailing` options are `true`, `func` is invoked
     * on the trailing edge of the timeout only if the the throttled function is
     * invoked more than once during the `wait` timeout.
     *
     * See [David Corbacho's article](http://drupalmotion.com/article/debounce-and-throttle-visual-explanation)
     * for details over the differences between `_.throttle` and `_.debounce`.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {Function} func The function to throttle.
     * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
     * @param {Object} [options] The options object.
     * @param {boolean} [options.leading=true] Specify invoking on the leading
     *  edge of the timeout.
     * @param {boolean} [options.trailing=true] Specify invoking on the trailing
     *  edge of the timeout.
     * @returns {Function} Returns the new throttled function.
     * @example
     *
     * // avoid excessively updating the position while scrolling
     * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
     *
     * // invoke `renewToken` when the click event is fired, but not more than once every 5 minutes
     * jQuery('.interactive').on('click', _.throttle(renewToken, 300000, {
     *   'trailing': false
     * }));
     *
     * // cancel a trailing throttled call
     * jQuery(window).on('popstate', throttled.cancel);
     */
    function throttle(func, wait, options) {
      var leading = true,
          trailing = true;

      if (typeof func != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      if (options === false) {
        leading = false;
      } else if (isObject(options)) {
        leading = 'leading' in options ? !!options.leading : leading;
        trailing = 'trailing' in options ? !!options.trailing : trailing;
      }
      debounceOptions.leading = leading;
      debounceOptions.maxWait = +wait;
      debounceOptions.trailing = trailing;
      return debounce(func, wait, debounceOptions);
    }

    /**
     * Creates a function that provides `value` to the wrapper function as its
     * first argument. Any additional arguments provided to the function are
     * appended to those provided to the wrapper function. The wrapper is invoked
     * with the `this` binding of the created function.
     *
     * @static
     * @memberOf _
     * @category Function
     * @param {*} value The value to wrap.
     * @param {Function} wrapper The wrapper function.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var p = _.wrap(_.escape, function(func, text) {
     *   return '<p>' + func(text) + '</p>';
     * });
     *
     * p('fred, barney, & pebbles');
     * // => '<p>fred, barney, &amp; pebbles</p>'
     */
    function wrap(value, wrapper) {
      wrapper = wrapper == null ? identity : wrapper;
      return createWrapper(wrapper, PARTIAL_FLAG, null, [value], []);
    }

    /*------------------------------------------------------------------------*/

    /**
     * Creates a clone of `value`. If `isDeep` is `true` nested objects are cloned,
     * otherwise they are assigned by reference. If `customizer` is provided it is
     * invoked to produce the cloned values. If `customizer` returns `undefined`
     * cloning is handled by the method instead. The `customizer` is bound to
     * `thisArg` and invoked with two argument; (value [, index|key, object]).
     *
     * **Note:** This method is loosely based on the
     * [structured clone algorithm](http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm).
     * The enumerable properties of `arguments` objects and objects created by
     * constructors other than `Object` are cloned to plain `Object` objects. An
     * empty object is returned for uncloneable values such as functions, DOM nodes,
     * Maps, Sets, and WeakMaps.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to clone.
     * @param {boolean} [isDeep] Specify a deep clone.
     * @param {Function} [customizer] The function to customize cloning values.
     * @param {*} [thisArg] The `this` binding of `customizer`.
     * @returns {*} Returns the cloned value.
     * @example
     *
     * var users = [
     *   { 'user': 'barney' },
     *   { 'user': 'fred' }
     * ];
     *
     * var shallow = _.clone(users);
     * shallow[0] === users[0];
     * // => true
     *
     * var deep = _.clone(users, true);
     * deep[0] === users[0];
     * // => false
     *
     * // using a customizer callback
     * var el = _.clone(document.body, function(value) {
     *   if (_.isElement(value)) {
     *     return value.cloneNode(false);
     *   }
     * });
     *
     * el === document.body
     * // => false
     * el.nodeName
     * // => BODY
     * el.childNodes.length;
     * // => 0
     */
    function clone(value, isDeep, customizer, thisArg) {
      if (isDeep && typeof isDeep != 'boolean' && isIterateeCall(value, isDeep, customizer)) {
        isDeep = false;
      }
      else if (typeof isDeep == 'function') {
        thisArg = customizer;
        customizer = isDeep;
        isDeep = false;
      }
      customizer = typeof customizer == 'function' && bindCallback(customizer, thisArg, 1);
      return baseClone(value, isDeep, customizer);
    }

    /**
     * Creates a deep clone of `value`. If `customizer` is provided it is invoked
     * to produce the cloned values. If `customizer` returns `undefined` cloning
     * is handled by the method instead. The `customizer` is bound to `thisArg`
     * and invoked with two argument; (value [, index|key, object]).
     *
     * **Note:** This method is loosely based on the
     * [structured clone algorithm](http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm).
     * The enumerable properties of `arguments` objects and objects created by
     * constructors other than `Object` are cloned to plain `Object` objects. An
     * empty object is returned for uncloneable values such as functions, DOM nodes,
     * Maps, Sets, and WeakMaps.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to deep clone.
     * @param {Function} [customizer] The function to customize cloning values.
     * @param {*} [thisArg] The `this` binding of `customizer`.
     * @returns {*} Returns the deep cloned value.
     * @example
     *
     * var users = [
     *   { 'user': 'barney' },
     *   { 'user': 'fred' }
     * ];
     *
     * var deep = _.cloneDeep(users);
     * deep[0] === users[0];
     * // => false
     *
     * // using a customizer callback
     * var el = _.cloneDeep(document.body, function(value) {
     *   if (_.isElement(value)) {
     *     return value.cloneNode(true);
     *   }
     * });
     *
     * el === document.body
     * // => false
     * el.nodeName
     * // => BODY
     * el.childNodes.length;
     * // => 20
     */
    function cloneDeep(value, customizer, thisArg) {
      customizer = typeof customizer == 'function' && bindCallback(customizer, thisArg, 1);
      return baseClone(value, true, customizer);
    }

    /**
     * Checks if `value` is classified as an `arguments` object.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
     * @example
     *
     * _.isArguments(function() { return arguments; }());
     * // => true
     *
     * _.isArguments([1, 2, 3]);
     * // => false
     */
    function isArguments(value) {
      var length = isObjectLike(value) ? value.length : undefined;
      return isLength(length) && objToString.call(value) == argsTag;
    }

    /**
     * Checks if `value` is classified as an `Array` object.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
     * @example
     *
     * _.isArray([1, 2, 3]);
     * // => true
     *
     * _.isArray(function() { return arguments; }());
     * // => false
     */
    var isArray = nativeIsArray || function(value) {
      return isObjectLike(value) && isLength(value.length) && objToString.call(value) == arrayTag;
    };

    /**
     * Checks if `value` is classified as a boolean primitive or object.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
     * @example
     *
     * _.isBoolean(false);
     * // => true
     *
     * _.isBoolean(null);
     * // => false
     */
    function isBoolean(value) {
      return value === true || value === false || (isObjectLike(value) && objToString.call(value) == boolTag);
    }

    /**
     * Checks if `value` is classified as a `Date` object.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
     * @example
     *
     * _.isDate(new Date);
     * // => true
     *
     * _.isDate('Mon April 23 2012');
     * // => false
     */
    function isDate(value) {
      return isObjectLike(value) && objToString.call(value) == dateTag;
    }

    /**
     * Checks if `value` is a DOM element.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.
     * @example
     *
     * _.isElement(document.body);
     * // => true
     *
     * _.isElement('<body>');
     * // => false
     */
    function isElement(value) {
      return !!value && value.nodeType === 1 && isObjectLike(value) &&
        (objToString.call(value).indexOf('Element') > -1);
    }
    // Fallback for environments without DOM support.
    if (!support.dom) {
      isElement = function(value) {
        return !!value && value.nodeType === 1 && isObjectLike(value) && !isPlainObject(value);
      };
    }

    /**
     * Checks if `value` is empty. A value is considered empty unless it is an
     * `arguments` object, array, string, or jQuery-like collection with a length
     * greater than `0` or an object with own enumerable properties.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {Array|Object|string} value The value to inspect.
     * @returns {boolean} Returns `true` if `value` is empty, else `false`.
     * @example
     *
     * _.isEmpty(null);
     * // => true
     *
     * _.isEmpty(true);
     * // => true
     *
     * _.isEmpty(1);
     * // => true
     *
     * _.isEmpty([1, 2, 3]);
     * // => false
     *
     * _.isEmpty({ 'a': 1 });
     * // => false
     */
    function isEmpty(value) {
      if (value == null) {
        return true;
      }
      var length = getLength(value);
      if (isLength(length) && (isArray(value) || isString(value) || isArguments(value) ||
          (isObjectLike(value) && isFunction(value.splice)))) {
        return !length;
      }
      return !keys(value).length;
    }

    /**
     * Performs a deep comparison between two values to determine if they are
     * equivalent. If `customizer` is provided it is invoked to compare values.
     * If `customizer` returns `undefined` comparisons are handled by the method
     * instead. The `customizer` is bound to `thisArg` and invoked with three
     * arguments: (value, other [, index|key]).
     *
     * **Note:** This method supports comparing arrays, booleans, `Date` objects,
     * numbers, `Object` objects, regexes, and strings. Objects are compared by
     * their own, not inherited, enumerable properties. Functions and DOM nodes
     * are **not** supported. Provide a customizer function to extend support
     * for comparing other values.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @param {Function} [customizer] The function to customize value comparisons.
     * @param {*} [thisArg] The `this` binding of `customizer`.
     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
     * @example
     *
     * var object = { 'user': 'fred' };
     * var other = { 'user': 'fred' };
     *
     * object == other;
     * // => false
     *
     * _.isEqual(object, other);
     * // => true
     *
     * // using a customizer callback
     * var array = ['hello', 'goodbye'];
     * var other = ['hi', 'goodbye'];
     *
     * _.isEqual(array, other, function(value, other) {
     *   if (_.every([value, other], RegExp.prototype.test, /^h(?:i|ello)$/)) {
     *     return true;
     *   }
     * });
     * // => true
     */
    function isEqual(value, other, customizer, thisArg) {
      customizer = typeof customizer == 'function' && bindCallback(customizer, thisArg, 3);
      if (!customizer && isStrictComparable(value) && isStrictComparable(other)) {
        return value === other;
      }
      var result = customizer ? customizer(value, other) : undefined;
      return result === undefined ? baseIsEqual(value, other, customizer) : !!result;
    }

    /**
     * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,
     * `SyntaxError`, `TypeError`, or `URIError` object.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an error object, else `false`.
     * @example
     *
     * _.isError(new Error);
     * // => true
     *
     * _.isError(Error);
     * // => false
     */
    function isError(value) {
      return isObjectLike(value) && typeof value.message == 'string' && objToString.call(value) == errorTag;
    }

    /**
     * Checks if `value` is a finite primitive number.
     *
     * **Note:** This method is based on [`Number.isFinite`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-number.isfinite).
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a finite number, else `false`.
     * @example
     *
     * _.isFinite(10);
     * // => true
     *
     * _.isFinite('10');
     * // => false
     *
     * _.isFinite(true);
     * // => false
     *
     * _.isFinite(Object(10));
     * // => false
     *
     * _.isFinite(Infinity);
     * // => false
     */
    var isFinite = nativeNumIsFinite || function(value) {
      return typeof value == 'number' && nativeIsFinite(value);
    };

    /**
     * Checks if `value` is classified as a `Function` object.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
     * @example
     *
     * _.isFunction(_);
     * // => true
     *
     * _.isFunction(/abc/);
     * // => false
     */
    var isFunction = !(baseIsFunction(/x/) || (Uint8Array && !baseIsFunction(Uint8Array))) ? baseIsFunction : function(value) {
      // The use of `Object#toString` avoids issues with the `typeof` operator
      // in older versions of Chrome and Safari which return 'function' for regexes
      // and Safari 8 equivalents which return 'object' for typed array constructors.
      return objToString.call(value) == funcTag;
    };

    /**
     * Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`.
     * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an object, else `false`.
     * @example
     *
     * _.isObject({});
     * // => true
     *
     * _.isObject([1, 2, 3]);
     * // => true
     *
     * _.isObject(1);
     * // => false
     */
    function isObject(value) {
      // Avoid a V8 JIT bug in Chrome 19-20.
      // See https://code.google.com/p/v8/issues/detail?id=2291 for more details.
      var type = typeof value;
      return type == 'function' || (!!value && type == 'object');
    }

    /**
     * Performs a deep comparison between `object` and `source` to determine if
     * `object` contains equivalent property values. If `customizer` is provided
     * it is invoked to compare values. If `customizer` returns `undefined`
     * comparisons are handled by the method instead. The `customizer` is bound
     * to `thisArg` and invoked with three arguments: (value, other, index|key).
     *
     * **Note:** This method supports comparing properties of arrays, booleans,
     * `Date` objects, numbers, `Object` objects, regexes, and strings. Functions
     * and DOM nodes are **not** supported. Provide a customizer function to extend
     * support for comparing other values.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {Object} object The object to inspect.
     * @param {Object} source The object of property values to match.
     * @param {Function} [customizer] The function to customize value comparisons.
     * @param {*} [thisArg] The `this` binding of `customizer`.
     * @returns {boolean} Returns `true` if `object` is a match, else `false`.
     * @example
     *
     * var object = { 'user': 'fred', 'age': 40 };
     *
     * _.isMatch(object, { 'age': 40 });
     * // => true
     *
     * _.isMatch(object, { 'age': 36 });
     * // => false
     *
     * // using a customizer callback
     * var object = { 'greeting': 'hello' };
     * var source = { 'greeting': 'hi' };
     *
     * _.isMatch(object, source, function(value, other) {
     *   return _.every([value, other], RegExp.prototype.test, /^h(?:i|ello)$/) || undefined;
     * });
     * // => true
     */
    function isMatch(object, source, customizer, thisArg) {
      var props = keys(source),
          length = props.length;

      if (!length) {
        return true;
      }
      if (object == null) {
        return false;
      }
      customizer = typeof customizer == 'function' && bindCallback(customizer, thisArg, 3);
      object = toObject(object);
      if (!customizer && length == 1) {
        var key = props[0],
            value = source[key];

        if (isStrictComparable(value)) {
          return value === object[key] && (value !== undefined || (key in object));
        }
      }
      var values = Array(length),
          strictCompareFlags = Array(length);

      while (length--) {
        value = values[length] = source[props[length]];
        strictCompareFlags[length] = isStrictComparable(value);
      }
      return baseIsMatch(object, props, values, strictCompareFlags, customizer);
    }

    /**
     * Checks if `value` is `NaN`.
     *
     * **Note:** This method is not the same as [`isNaN`](https://es5.github.io/#x15.1.2.4)
     * which returns `true` for `undefined` and other non-numeric values.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
     * @example
     *
     * _.isNaN(NaN);
     * // => true
     *
     * _.isNaN(new Number(NaN));
     * // => true
     *
     * isNaN(undefined);
     * // => true
     *
     * _.isNaN(undefined);
     * // => false
     */
    function isNaN(value) {
      // An `NaN` primitive is the only value that is not equal to itself.
      // Perform the `toStringTag` check first to avoid errors with some host objects in IE.
      return isNumber(value) && value != +value;
    }

    /**
     * Checks if `value` is a native function.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a native function, else `false`.
     * @example
     *
     * _.isNative(Array.prototype.push);
     * // => true
     *
     * _.isNative(_);
     * // => false
     */
    function isNative(value) {
      if (value == null) {
        return false;
      }
      if (objToString.call(value) == funcTag) {
        return reIsNative.test(fnToString.call(value));
      }
      return isObjectLike(value) && reIsHostCtor.test(value);
    }

    /**
     * Checks if `value` is `null`.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is `null`, else `false`.
     * @example
     *
     * _.isNull(null);
     * // => true
     *
     * _.isNull(void 0);
     * // => false
     */
    function isNull(value) {
      return value === null;
    }

    /**
     * Checks if `value` is classified as a `Number` primitive or object.
     *
     * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are classified
     * as numbers, use the `_.isFinite` method.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
     * @example
     *
     * _.isNumber(8.4);
     * // => true
     *
     * _.isNumber(NaN);
     * // => true
     *
     * _.isNumber('8.4');
     * // => false
     */
    function isNumber(value) {
      return typeof value == 'number' || (isObjectLike(value) && objToString.call(value) == numberTag);
    }

    /**
     * Checks if `value` is a plain object, that is, an object created by the
     * `Object` constructor or one with a `[[Prototype]]` of `null`.
     *
     * **Note:** This method assumes objects created by the `Object` constructor
     * have no inherited enumerable properties.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     * }
     *
     * _.isPlainObject(new Foo);
     * // => false
     *
     * _.isPlainObject([1, 2, 3]);
     * // => false
     *
     * _.isPlainObject({ 'x': 0, 'y': 0 });
     * // => true
     *
     * _.isPlainObject(Object.create(null));
     * // => true
     */
    var isPlainObject = !getPrototypeOf ? shimIsPlainObject : function(value) {
      if (!(value && objToString.call(value) == objectTag)) {
        return false;
      }
      var valueOf = value.valueOf,
          objProto = isNative(valueOf) && (objProto = getPrototypeOf(valueOf)) && getPrototypeOf(objProto);

      return objProto
        ? (value == objProto || getPrototypeOf(value) == objProto)
        : shimIsPlainObject(value);
    };

    /**
     * Checks if `value` is classified as a `RegExp` object.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
     * @example
     *
     * _.isRegExp(/abc/);
     * // => true
     *
     * _.isRegExp('/abc/');
     * // => false
     */
    function isRegExp(value) {
      return (isObjectLike(value) && objToString.call(value) == regexpTag) || false;
    }

    /**
     * Checks if `value` is classified as a `String` primitive or object.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
     * @example
     *
     * _.isString('abc');
     * // => true
     *
     * _.isString(1);
     * // => false
     */
    function isString(value) {
      return typeof value == 'string' || (isObjectLike(value) && objToString.call(value) == stringTag);
    }

    /**
     * Checks if `value` is classified as a typed array.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
     * @example
     *
     * _.isTypedArray(new Uint8Array);
     * // => true
     *
     * _.isTypedArray([]);
     * // => false
     */
    function isTypedArray(value) {
      return isObjectLike(value) && isLength(value.length) && !!typedArrayTags[objToString.call(value)];
    }

    /**
     * Checks if `value` is `undefined`.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`.
     * @example
     *
     * _.isUndefined(void 0);
     * // => true
     *
     * _.isUndefined(null);
     * // => false
     */
    function isUndefined(value) {
      return value === undefined;
    }

    /**
     * Converts `value` to an array.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {Array} Returns the converted array.
     * @example
     *
     * (function() {
     *   return _.toArray(arguments).slice(1);
     * }(1, 2, 3));
     * // => [2, 3]
     */
    function toArray(value) {
      var length = value ? getLength(value) : 0;
      if (!isLength(length)) {
        return values(value);
      }
      if (!length) {
        return [];
      }
      return arrayCopy(value);
    }

    /**
     * Converts `value` to a plain object flattening inherited enumerable
     * properties of `value` to own properties of the plain object.
     *
     * @static
     * @memberOf _
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {Object} Returns the converted plain object.
     * @example
     *
     * function Foo() {
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.assign({ 'a': 1 }, new Foo);
     * // => { 'a': 1, 'b': 2 }
     *
     * _.assign({ 'a': 1 }, _.toPlainObject(new Foo));
     * // => { 'a': 1, 'b': 2, 'c': 3 }
     */
    function toPlainObject(value) {
      return baseCopy(value, keysIn(value));
    }

    /*------------------------------------------------------------------------*/

    /**
     * Assigns own enumerable properties of source object(s) to the destination
     * object. Subsequent sources overwrite property assignments of previous sources.
     * If `customizer` is provided it is invoked to produce the assigned values.
     * The `customizer` is bound to `thisArg` and invoked with five arguments:
     * (objectValue, sourceValue, key, object, source).
     *
     * **Note:** This method mutates `object` and is based on
     * [`Object.assign`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.assign).
     *
     *
     * @static
     * @memberOf _
     * @alias extend
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} [sources] The source objects.
     * @param {Function} [customizer] The function to customize assigned values.
     * @param {*} [thisArg] The `this` binding of `customizer`.
     * @returns {Object} Returns `object`.
     * @example
     *
     * _.assign({ 'user': 'barney' }, { 'age': 40 }, { 'user': 'fred' });
     * // => { 'user': 'fred', 'age': 40 }
     *
     * // using a customizer callback
     * var defaults = _.partialRight(_.assign, function(value, other) {
     *   return _.isUndefined(value) ? other : value;
     * });
     *
     * defaults({ 'user': 'barney' }, { 'age': 36 }, { 'user': 'fred' });
     * // => { 'user': 'barney', 'age': 36 }
     */
    var assign = createAssigner(function(object, source, customizer) {
      return customizer
        ? assignWith(object, source, customizer)
        : baseAssign(object, source);
    });

    /**
     * Creates an object that inherits from the given `prototype` object. If a
     * `properties` object is provided its own enumerable properties are assigned
     * to the created object.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} prototype The object to inherit from.
     * @param {Object} [properties] The properties to assign to the object.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {Object} Returns the new object.
     * @example
     *
     * function Shape() {
     *   this.x = 0;
     *   this.y = 0;
     * }
     *
     * function Circle() {
     *   Shape.call(this);
     * }
     *
     * Circle.prototype = _.create(Shape.prototype, {
     *   'constructor': Circle
     * });
     *
     * var circle = new Circle;
     * circle instanceof Circle;
     * // => true
     *
     * circle instanceof Shape;
     * // => true
     */
    function create(prototype, properties, guard) {
      var result = baseCreate(prototype);
      if (guard && isIterateeCall(prototype, properties, guard)) {
        properties = null;
      }
      return properties ? baseAssign(result, properties) : result;
    }

    /**
     * Assigns own enumerable properties of source object(s) to the destination
     * object for all destination properties that resolve to `undefined`. Once a
     * property is set, additional values of the same property are ignored.
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} [sources] The source objects.
     * @returns {Object} Returns `object`.
     * @example
     *
     * _.defaults({ 'user': 'barney' }, { 'age': 36 }, { 'user': 'fred' });
     * // => { 'user': 'barney', 'age': 36 }
     */
    var defaults = restParam(function(args) {
      var object = args[0];
      if (object == null) {
        return object;
      }
      args.push(assignDefaults);
      return assign.apply(undefined, args);
    });

    /**
     * This method is like `_.find` except that it returns the key of the first
     * element `predicate` returns truthy for instead of the element itself.
     *
     * If a property name is provided for `predicate` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `predicate` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to search.
     * @param {Function|Object|string} [predicate=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {string|undefined} Returns the key of the matched element, else `undefined`.
     * @example
     *
     * var users = {
     *   'barney':  { 'age': 36, 'active': true },
     *   'fred':    { 'age': 40, 'active': false },
     *   'pebbles': { 'age': 1,  'active': true }
     * };
     *
     * _.findKey(users, function(chr) {
     *   return chr.age < 40;
     * });
     * // => 'barney' (iteration order is not guaranteed)
     *
     * // using the `_.matches` callback shorthand
     * _.findKey(users, { 'age': 1, 'active': true });
     * // => 'pebbles'
     *
     * // using the `_.matchesProperty` callback shorthand
     * _.findKey(users, 'active', false);
     * // => 'fred'
     *
     * // using the `_.property` callback shorthand
     * _.findKey(users, 'active');
     * // => 'barney'
     */
    var findKey = createFindKey(baseForOwn);

    /**
     * This method is like `_.findKey` except that it iterates over elements of
     * a collection in the opposite order.
     *
     * If a property name is provided for `predicate` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `predicate` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to search.
     * @param {Function|Object|string} [predicate=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {string|undefined} Returns the key of the matched element, else `undefined`.
     * @example
     *
     * var users = {
     *   'barney':  { 'age': 36, 'active': true },
     *   'fred':    { 'age': 40, 'active': false },
     *   'pebbles': { 'age': 1,  'active': true }
     * };
     *
     * _.findLastKey(users, function(chr) {
     *   return chr.age < 40;
     * });
     * // => returns `pebbles` assuming `_.findKey` returns `barney`
     *
     * // using the `_.matches` callback shorthand
     * _.findLastKey(users, { 'age': 36, 'active': true });
     * // => 'barney'
     *
     * // using the `_.matchesProperty` callback shorthand
     * _.findLastKey(users, 'active', false);
     * // => 'fred'
     *
     * // using the `_.property` callback shorthand
     * _.findLastKey(users, 'active');
     * // => 'pebbles'
     */
    var findLastKey = createFindKey(baseForOwnRight);

    /**
     * Iterates over own and inherited enumerable properties of an object invoking
     * `iteratee` for each property. The `iteratee` is bound to `thisArg` and invoked
     * with three arguments: (value, key, object). Iteratee functions may exit
     * iteration early by explicitly returning `false`.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {Object} Returns `object`.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.forIn(new Foo, function(value, key) {
     *   console.log(key);
     * });
     * // => logs 'a', 'b', and 'c' (iteration order is not guaranteed)
     */
    var forIn = createForIn(baseFor);

    /**
     * This method is like `_.forIn` except that it iterates over properties of
     * `object` in the opposite order.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {Object} Returns `object`.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.forInRight(new Foo, function(value, key) {
     *   console.log(key);
     * });
     * // => logs 'c', 'b', and 'a' assuming `_.forIn ` logs 'a', 'b', and 'c'
     */
    var forInRight = createForIn(baseForRight);

    /**
     * Iterates over own enumerable properties of an object invoking `iteratee`
     * for each property. The `iteratee` is bound to `thisArg` and invoked with
     * three arguments: (value, key, object). Iteratee functions may exit iteration
     * early by explicitly returning `false`.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {Object} Returns `object`.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.forOwn(new Foo, function(value, key) {
     *   console.log(key);
     * });
     * // => logs 'a' and 'b' (iteration order is not guaranteed)
     */
    var forOwn = createForOwn(baseForOwn);

    /**
     * This method is like `_.forOwn` except that it iterates over properties of
     * `object` in the opposite order.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {Object} Returns `object`.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.forOwnRight(new Foo, function(value, key) {
     *   console.log(key);
     * });
     * // => logs 'b' and 'a' assuming `_.forOwn` logs 'a' and 'b'
     */
    var forOwnRight = createForOwn(baseForOwnRight);

    /**
     * Creates an array of function property names from all enumerable properties,
     * own and inherited, of `object`.
     *
     * @static
     * @memberOf _
     * @alias methods
     * @category Object
     * @param {Object} object The object to inspect.
     * @returns {Array} Returns the new array of property names.
     * @example
     *
     * _.functions(_);
     * // => ['after', 'ary', 'assign', ...]
     */
    function functions(object) {
      return baseFunctions(object, keysIn(object));
    }

    /**
     * Gets the property value of `path` on `object`. If the resolved value is
     * `undefined` the `defaultValue` is used in its place.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to query.
     * @param {Array|string} path The path of the property to get.
     * @param {*} [defaultValue] The value returned if the resolved value is `undefined`.
     * @returns {*} Returns the resolved value.
     * @example
     *
     * var object = { 'a': [{ 'b': { 'c': 3 } }] };
     *
     * _.get(object, 'a[0].b.c');
     * // => 3
     *
     * _.get(object, ['a', '0', 'b', 'c']);
     * // => 3
     *
     * _.get(object, 'a.b.c', 'default');
     * // => 'default'
     */
    function get(object, path, defaultValue) {
      var result = object == null ? undefined : baseGet(object, toPath(path), path + '');
      return result === undefined ? defaultValue : result;
    }

    /**
     * Checks if `path` is a direct property.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to query.
     * @param {Array|string} path The path to check.
     * @returns {boolean} Returns `true` if `path` is a direct property, else `false`.
     * @example
     *
     * var object = { 'a': { 'b': { 'c': 3 } } };
     *
     * _.has(object, 'a');
     * // => true
     *
     * _.has(object, 'a.b.c');
     * // => true
     *
     * _.has(object, ['a', 'b', 'c']);
     * // => true
     */
    function has(object, path) {
      if (object == null) {
        return false;
      }
      var result = hasOwnProperty.call(object, path);
      if (!result && !isKey(path)) {
        path = toPath(path);
        object = path.length == 1 ? object : baseGet(object, baseSlice(path, 0, -1));
        path = last(path);
        result = object != null && hasOwnProperty.call(object, path);
      }
      return result;
    }

    /**
     * Creates an object composed of the inverted keys and values of `object`.
     * If `object` contains duplicate values, subsequent values overwrite property
     * assignments of previous values unless `multiValue` is `true`.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to invert.
     * @param {boolean} [multiValue] Allow multiple values per key.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {Object} Returns the new inverted object.
     * @example
     *
     * var object = { 'a': 1, 'b': 2, 'c': 1 };
     *
     * _.invert(object);
     * // => { '1': 'c', '2': 'b' }
     *
     * // with `multiValue`
     * _.invert(object, true);
     * // => { '1': ['a', 'c'], '2': ['b'] }
     */
    function invert(object, multiValue, guard) {
      if (guard && isIterateeCall(object, multiValue, guard)) {
        multiValue = null;
      }
      var index = -1,
          props = keys(object),
          length = props.length,
          result = {};

      while (++index < length) {
        var key = props[index],
            value = object[key];

        if (multiValue) {
          if (hasOwnProperty.call(result, value)) {
            result[value].push(key);
          } else {
            result[value] = [key];
          }
        }
        else {
          result[value] = key;
        }
      }
      return result;
    }

    /**
     * Creates an array of the own enumerable property names of `object`.
     *
     * **Note:** Non-object values are coerced to objects. See the
     * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.keys)
     * for more details.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.keys(new Foo);
     * // => ['a', 'b'] (iteration order is not guaranteed)
     *
     * _.keys('hi');
     * // => ['0', '1']
     */
    var keys = !nativeKeys ? shimKeys : function(object) {
      if (object) {
        var Ctor = object.constructor,
            length = object.length;
      }
      if ((typeof Ctor == 'function' && Ctor.prototype === object) ||
          (typeof object != 'function' && isLength(length))) {
        return shimKeys(object);
      }
      return isObject(object) ? nativeKeys(object) : [];
    };

    /**
     * Creates an array of the own and inherited enumerable property names of `object`.
     *
     * **Note:** Non-object values are coerced to objects.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.keysIn(new Foo);
     * // => ['a', 'b', 'c'] (iteration order is not guaranteed)
     */
    function keysIn(object) {
      if (object == null) {
        return [];
      }
      if (!isObject(object)) {
        object = Object(object);
      }
      var length = object.length;
      length = (length && isLength(length) &&
        (isArray(object) || (support.nonEnumArgs && isArguments(object))) && length) || 0;

      var Ctor = object.constructor,
          index = -1,
          isProto = typeof Ctor == 'function' && Ctor.prototype === object,
          result = Array(length),
          skipIndexes = length > 0;

      while (++index < length) {
        result[index] = (index + '');
      }
      for (var key in object) {
        if (!(skipIndexes && isIndex(key, length)) &&
            !(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
          result.push(key);
        }
      }
      return result;
    }

    /**
     * Creates an object with the same keys as `object` and values generated by
     * running each own enumerable property of `object` through `iteratee`. The
     * iteratee function is bound to `thisArg` and invoked with three arguments:
     * (value, key, object).
     *
     * If a property name is provided for `iteratee` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `iteratee` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function|Object|string} [iteratee=_.identity] The function invoked
     *  per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {Object} Returns the new mapped object.
     * @example
     *
     * _.mapValues({ 'a': 1, 'b': 2 }, function(n) {
     *   return n * 3;
     * });
     * // => { 'a': 3, 'b': 6 }
     *
     * var users = {
     *   'fred':    { 'user': 'fred',    'age': 40 },
     *   'pebbles': { 'user': 'pebbles', 'age': 1 }
     * };
     *
     * // using the `_.property` callback shorthand
     * _.mapValues(users, 'age');
     * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
     */
    function mapValues(object, iteratee, thisArg) {
      var result = {};
      iteratee = getCallback(iteratee, thisArg, 3);

      baseForOwn(object, function(value, key, object) {
        result[key] = iteratee(value, key, object);
      });
      return result;
    }

    /**
     * Recursively merges own enumerable properties of the source object(s), that
     * don't resolve to `undefined` into the destination object. Subsequent sources
     * overwrite property assignments of previous sources. If `customizer` is
     * provided it is invoked to produce the merged values of the destination and
     * source properties. If `customizer` returns `undefined` merging is handled
     * by the method instead. The `customizer` is bound to `thisArg` and invoked
     * with five arguments: (objectValue, sourceValue, key, object, source).
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} [sources] The source objects.
     * @param {Function} [customizer] The function to customize assigned values.
     * @param {*} [thisArg] The `this` binding of `customizer`.
     * @returns {Object} Returns `object`.
     * @example
     *
     * var users = {
     *   'data': [{ 'user': 'barney' }, { 'user': 'fred' }]
     * };
     *
     * var ages = {
     *   'data': [{ 'age': 36 }, { 'age': 40 }]
     * };
     *
     * _.merge(users, ages);
     * // => { 'data': [{ 'user': 'barney', 'age': 36 }, { 'user': 'fred', 'age': 40 }] }
     *
     * // using a customizer callback
     * var object = {
     *   'fruits': ['apple'],
     *   'vegetables': ['beet']
     * };
     *
     * var other = {
     *   'fruits': ['banana'],
     *   'vegetables': ['carrot']
     * };
     *
     * _.merge(object, other, function(a, b) {
     *   if (_.isArray(a)) {
     *     return a.concat(b);
     *   }
     * });
     * // => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot'] }
     */
    var merge = createAssigner(baseMerge);

    /**
     * The opposite of `_.pick`; this method creates an object composed of the
     * own and inherited enumerable properties of `object` that are not omitted.
     * Property names may be specified as individual arguments or as arrays of
     * property names. If `predicate` is provided it is invoked for each property
     * of `object` omitting the properties `predicate` returns truthy for. The
     * predicate is bound to `thisArg` and invoked with three arguments:
     * (value, key, object).
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The source object.
     * @param {Function|...(string|string[])} [predicate] The function invoked per
     *  iteration or property names to omit, specified as individual property
     *  names or arrays of property names.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {Object} Returns the new object.
     * @example
     *
     * var object = { 'user': 'fred', 'age': 40 };
     *
     * _.omit(object, 'age');
     * // => { 'user': 'fred' }
     *
     * _.omit(object, _.isNumber);
     * // => { 'user': 'fred' }
     */
    var omit = restParam(function(object, props) {
      if (object == null) {
        return {};
      }
      if (typeof props[0] != 'function') {
        var props = arrayMap(baseFlatten(props), String);
        return pickByArray(object, baseDifference(keysIn(object), props));
      }
      var predicate = bindCallback(props[0], props[1], 3);
      return pickByCallback(object, function(value, key, object) {
        return !predicate(value, key, object);
      });
    });

    /**
     * Creates a two dimensional array of the key-value pairs for `object`,
     * e.g. `[[key1, value1], [key2, value2]]`.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the new array of key-value pairs.
     * @example
     *
     * _.pairs({ 'barney': 36, 'fred': 40 });
     * // => [['barney', 36], ['fred', 40]] (iteration order is not guaranteed)
     */
    function pairs(object) {
      var index = -1,
          props = keys(object),
          length = props.length,
          result = Array(length);

      while (++index < length) {
        var key = props[index];
        result[index] = [key, object[key]];
      }
      return result;
    }

    /**
     * Creates an object composed of the picked `object` properties. Property
     * names may be specified as individual arguments or as arrays of property
     * names. If `predicate` is provided it is invoked for each property of `object`
     * picking the properties `predicate` returns truthy for. The predicate is
     * bound to `thisArg` and invoked with three arguments: (value, key, object).
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The source object.
     * @param {Function|...(string|string[])} [predicate] The function invoked per
     *  iteration or property names to pick, specified as individual property
     *  names or arrays of property names.
     * @param {*} [thisArg] The `this` binding of `predicate`.
     * @returns {Object} Returns the new object.
     * @example
     *
     * var object = { 'user': 'fred', 'age': 40 };
     *
     * _.pick(object, 'user');
     * // => { 'user': 'fred' }
     *
     * _.pick(object, _.isString);
     * // => { 'user': 'fred' }
     */
    var pick = restParam(function(object, props) {
      if (object == null) {
        return {};
      }
      return typeof props[0] == 'function'
        ? pickByCallback(object, bindCallback(props[0], props[1], 3))
        : pickByArray(object, baseFlatten(props));
    });

    /**
     * This method is like `_.get` except that if the resolved value is a function
     * it is invoked with the `this` binding of its parent object and its result
     * is returned.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to query.
     * @param {Array|string} path The path of the property to resolve.
     * @param {*} [defaultValue] The value returned if the resolved value is `undefined`.
     * @returns {*} Returns the resolved value.
     * @example
     *
     * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };
     *
     * _.result(object, 'a[0].b.c1');
     * // => 3
     *
     * _.result(object, 'a[0].b.c2');
     * // => 4
     *
     * _.result(object, 'a.b.c', 'default');
     * // => 'default'
     *
     * _.result(object, 'a.b.c', _.constant('default'));
     * // => 'default'
     */
    function result(object, path, defaultValue) {
      var result = object == null ? undefined : object[path];
      if (result === undefined) {
        if (object != null && !isKey(path, object)) {
          path = toPath(path);
          object = path.length == 1 ? object : baseGet(object, baseSlice(path, 0, -1));
          result = object == null ? undefined : object[last(path)];
        }
        result = result === undefined ? defaultValue : result;
      }
      return isFunction(result) ? result.call(object) : result;
    }

    /**
     * Sets the property value of `path` on `object`. If a portion of `path`
     * does not exist it is created.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to augment.
     * @param {Array|string} path The path of the property to set.
     * @param {*} value The value to set.
     * @returns {Object} Returns `object`.
     * @example
     *
     * var object = { 'a': [{ 'b': { 'c': 3 } }] };
     *
     * _.set(object, 'a[0].b.c', 4);
     * console.log(object.a[0].b.c);
     * // => 4
     *
     * _.set(object, 'x[0].y.z', 5);
     * console.log(object.x[0].y.z);
     * // => 5
     */
    function set(object, path, value) {
      if (object == null) {
        return object;
      }
      var pathKey = (path + '');
      path = (object[pathKey] != null || isKey(path, object)) ? [pathKey] : toPath(path);

      var index = -1,
          length = path.length,
          endIndex = length - 1,
          nested = object;

      while (nested != null && ++index < length) {
        var key = path[index];
        if (isObject(nested)) {
          if (index == endIndex) {
            nested[key] = value;
          } else if (nested[key] == null) {
            nested[key] = isIndex(path[index + 1]) ? [] : {};
          }
        }
        nested = nested[key];
      }
      return object;
    }

    /**
     * An alternative to `_.reduce`; this method transforms `object` to a new
     * `accumulator` object which is the result of running each of its own enumerable
     * properties through `iteratee`, with each invocation potentially mutating
     * the `accumulator` object. The `iteratee` is bound to `thisArg` and invoked
     * with four arguments: (accumulator, value, key, object). Iteratee functions
     * may exit iteration early by explicitly returning `false`.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Array|Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {*} [accumulator] The custom accumulator value.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {*} Returns the accumulated value.
     * @example
     *
     * _.transform([2, 3, 4], function(result, n) {
     *   result.push(n *= n);
     *   return n % 2 == 0;
     * });
     * // => [4, 9]
     *
     * _.transform({ 'a': 1, 'b': 2 }, function(result, n, key) {
     *   result[key] = n * 3;
     * });
     * // => { 'a': 3, 'b': 6 }
     */
    function transform(object, iteratee, accumulator, thisArg) {
      var isArr = isArray(object) || isTypedArray(object);
      iteratee = getCallback(iteratee, thisArg, 4);

      if (accumulator == null) {
        if (isArr || isObject(object)) {
          var Ctor = object.constructor;
          if (isArr) {
            accumulator = isArray(object) ? new Ctor : [];
          } else {
            accumulator = baseCreate(isFunction(Ctor) && Ctor.prototype);
          }
        } else {
          accumulator = {};
        }
      }
      (isArr ? arrayEach : baseForOwn)(object, function(value, index, object) {
        return iteratee(accumulator, value, index, object);
      });
      return accumulator;
    }

    /**
     * Creates an array of the own enumerable property values of `object`.
     *
     * **Note:** Non-object values are coerced to objects.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property values.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.values(new Foo);
     * // => [1, 2] (iteration order is not guaranteed)
     *
     * _.values('hi');
     * // => ['h', 'i']
     */
    function values(object) {
      return baseValues(object, keys(object));
    }

    /**
     * Creates an array of the own and inherited enumerable property values
     * of `object`.
     *
     * **Note:** Non-object values are coerced to objects.
     *
     * @static
     * @memberOf _
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property values.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.valuesIn(new Foo);
     * // => [1, 2, 3] (iteration order is not guaranteed)
     */
    function valuesIn(object) {
      return baseValues(object, keysIn(object));
    }

    /*------------------------------------------------------------------------*/

    /**
     * Checks if `n` is between `start` and up to but not including, `end`. If
     * `end` is not specified it is set to `start` with `start` then set to `0`.
     *
     * @static
     * @memberOf _
     * @category Number
     * @param {number} n The number to check.
     * @param {number} [start=0] The start of the range.
     * @param {number} end The end of the range.
     * @returns {boolean} Returns `true` if `n` is in the range, else `false`.
     * @example
     *
     * _.inRange(3, 2, 4);
     * // => true
     *
     * _.inRange(4, 8);
     * // => true
     *
     * _.inRange(4, 2);
     * // => false
     *
     * _.inRange(2, 2);
     * // => false
     *
     * _.inRange(1.2, 2);
     * // => true
     *
     * _.inRange(5.2, 4);
     * // => false
     */
    function inRange(value, start, end) {
      start = +start || 0;
      if (typeof end === 'undefined') {
        end = start;
        start = 0;
      } else {
        end = +end || 0;
      }
      return value >= nativeMin(start, end) && value < nativeMax(start, end);
    }

    /**
     * Produces a random number between `min` and `max` (inclusive). If only one
     * argument is provided a number between `0` and the given number is returned.
     * If `floating` is `true`, or either `min` or `max` are floats, a floating-point
     * number is returned instead of an integer.
     *
     * @static
     * @memberOf _
     * @category Number
     * @param {number} [min=0] The minimum possible value.
     * @param {number} [max=1] The maximum possible value.
     * @param {boolean} [floating] Specify returning a floating-point number.
     * @returns {number} Returns the random number.
     * @example
     *
     * _.random(0, 5);
     * // => an integer between 0 and 5
     *
     * _.random(5);
     * // => also an integer between 0 and 5
     *
     * _.random(5, true);
     * // => a floating-point number between 0 and 5
     *
     * _.random(1.2, 5.2);
     * // => a floating-point number between 1.2 and 5.2
     */
    function random(min, max, floating) {
      if (floating && isIterateeCall(min, max, floating)) {
        max = floating = null;
      }
      var noMin = min == null,
          noMax = max == null;

      if (floating == null) {
        if (noMax && typeof min == 'boolean') {
          floating = min;
          min = 1;
        }
        else if (typeof max == 'boolean') {
          floating = max;
          noMax = true;
        }
      }
      if (noMin && noMax) {
        max = 1;
        noMax = false;
      }
      min = +min || 0;
      if (noMax) {
        max = min;
        min = 0;
      } else {
        max = +max || 0;
      }
      if (floating || min % 1 || max % 1) {
        var rand = nativeRandom();
        return nativeMin(min + (rand * (max - min + parseFloat('1e-' + ((rand + '').length - 1)))), max);
      }
      return baseRandom(min, max);
    }

    /*------------------------------------------------------------------------*/

    /**
     * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase).
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to convert.
     * @returns {string} Returns the camel cased string.
     * @example
     *
     * _.camelCase('Foo Bar');
     * // => 'fooBar'
     *
     * _.camelCase('--foo-bar');
     * // => 'fooBar'
     *
     * _.camelCase('__foo_bar__');
     * // => 'fooBar'
     */
    var camelCase = createCompounder(function(result, word, index) {
      word = word.toLowerCase();
      return result + (index ? (word.charAt(0).toUpperCase() + word.slice(1)) : word);
    });

    /**
     * Capitalizes the first character of `string`.
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to capitalize.
     * @returns {string} Returns the capitalized string.
     * @example
     *
     * _.capitalize('fred');
     * // => 'Fred'
     */
    function capitalize(string) {
      string = baseToString(string);
      return string && (string.charAt(0).toUpperCase() + string.slice(1));
    }

    /**
     * Deburrs `string` by converting [latin-1 supplementary letters](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)
     * to basic latin letters and removing [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to deburr.
     * @returns {string} Returns the deburred string.
     * @example
     *
     * _.deburr('déjà vu');
     * // => 'deja vu'
     */
    function deburr(string) {
      string = baseToString(string);
      return string && string.replace(reLatin1, deburrLetter).replace(reComboMark, '');
    }

    /**
     * Checks if `string` ends with the given target string.
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to search.
     * @param {string} [target] The string to search for.
     * @param {number} [position=string.length] The position to search from.
     * @returns {boolean} Returns `true` if `string` ends with `target`, else `false`.
     * @example
     *
     * _.endsWith('abc', 'c');
     * // => true
     *
     * _.endsWith('abc', 'b');
     * // => false
     *
     * _.endsWith('abc', 'b', 2);
     * // => true
     */
    function endsWith(string, target, position) {
      string = baseToString(string);
      target = (target + '');

      var length = string.length;
      position = position === undefined
        ? length
        : nativeMin(position < 0 ? 0 : (+position || 0), length);

      position -= target.length;
      return position >= 0 && string.indexOf(target, position) == position;
    }

    /**
     * Converts the characters "&", "<", ">", '"', "'", and "\`", in `string` to
     * their corresponding HTML entities.
     *
     * **Note:** No other characters are escaped. To escape additional characters
     * use a third-party library like [_he_](https://mths.be/he).
     *
     * Though the ">" character is escaped for symmetry, characters like
     * ">" and "/" don't require escaping in HTML and have no special meaning
     * unless they're part of a tag or unquoted attribute value.
     * See [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
     * (under "semi-related fun fact") for more details.
     *
     * Backticks are escaped because in Internet Explorer < 9, they can break out
     * of attribute values or HTML comments. See [#59](https://html5sec.org/#59),
     * [#102](https://html5sec.org/#102), [#108](https://html5sec.org/#108), and
     * [#133](https://html5sec.org/#133) of the [HTML5 Security Cheatsheet](https://html5sec.org/)
     * for more details.
     *
     * When working with HTML you should always [quote attribute values](http://wonko.com/post/html-escaping)
     * to reduce XSS vectors.
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to escape.
     * @returns {string} Returns the escaped string.
     * @example
     *
     * _.escape('fred, barney, & pebbles');
     * // => 'fred, barney, &amp; pebbles'
     */
    function escape(string) {
      // Reset `lastIndex` because in IE < 9 `String#replace` does not.
      string = baseToString(string);
      return (string && reHasUnescapedHtml.test(string))
        ? string.replace(reUnescapedHtml, escapeHtmlChar)
        : string;
    }

    /**
     * Escapes the `RegExp` special characters "\", "/", "^", "$", ".", "|", "?",
     * "*", "+", "(", ")", "[", "]", "{" and "}" in `string`.
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to escape.
     * @returns {string} Returns the escaped string.
     * @example
     *
     * _.escapeRegExp('[lodash](https://lodash.com/)');
     * // => '\[lodash\]\(https:\/\/lodash\.com\/\)'
     */
    function escapeRegExp(string) {
      string = baseToString(string);
      return (string && reHasRegExpChars.test(string))
        ? string.replace(reRegExpChars, '\\$&')
        : string;
    }

    /**
     * Converts `string` to [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles).
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to convert.
     * @returns {string} Returns the kebab cased string.
     * @example
     *
     * _.kebabCase('Foo Bar');
     * // => 'foo-bar'
     *
     * _.kebabCase('fooBar');
     * // => 'foo-bar'
     *
     * _.kebabCase('__foo_bar__');
     * // => 'foo-bar'
     */
    var kebabCase = createCompounder(function(result, word, index) {
      return result + (index ? '-' : '') + word.toLowerCase();
    });

    /**
     * Pads `string` on the left and right sides if it is shorter than `length`.
     * Padding characters are truncated if they can't be evenly divided by `length`.
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to pad.
     * @param {number} [length=0] The padding length.
     * @param {string} [chars=' '] The string used as padding.
     * @returns {string} Returns the padded string.
     * @example
     *
     * _.pad('abc', 8);
     * // => '  abc   '
     *
     * _.pad('abc', 8, '_-');
     * // => '_-abc_-_'
     *
     * _.pad('abc', 3);
     * // => 'abc'
     */
    function pad(string, length, chars) {
      string = baseToString(string);
      length = +length;

      var strLength = string.length;
      if (strLength >= length || !nativeIsFinite(length)) {
        return string;
      }
      var mid = (length - strLength) / 2,
          leftLength = floor(mid),
          rightLength = ceil(mid);

      chars = createPadding('', rightLength, chars);
      return chars.slice(0, leftLength) + string + chars;
    }

    /**
     * Pads `string` on the left side if it is shorter than `length`. Padding
     * characters are truncated if they exceed `length`.
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to pad.
     * @param {number} [length=0] The padding length.
     * @param {string} [chars=' '] The string used as padding.
     * @returns {string} Returns the padded string.
     * @example
     *
     * _.padLeft('abc', 6);
     * // => '   abc'
     *
     * _.padLeft('abc', 6, '_-');
     * // => '_-_abc'
     *
     * _.padLeft('abc', 3);
     * // => 'abc'
     */
    var padLeft = createPadDir();

    /**
     * Pads `string` on the right side if it is shorter than `length`. Padding
     * characters are truncated if they exceed `length`.
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to pad.
     * @param {number} [length=0] The padding length.
     * @param {string} [chars=' '] The string used as padding.
     * @returns {string} Returns the padded string.
     * @example
     *
     * _.padRight('abc', 6);
     * // => 'abc   '
     *
     * _.padRight('abc', 6, '_-');
     * // => 'abc_-_'
     *
     * _.padRight('abc', 3);
     * // => 'abc'
     */
    var padRight = createPadDir(true);

    /**
     * Converts `string` to an integer of the specified radix. If `radix` is
     * `undefined` or `0`, a `radix` of `10` is used unless `value` is a hexadecimal,
     * in which case a `radix` of `16` is used.
     *
     * **Note:** This method aligns with the [ES5 implementation](https://es5.github.io/#E)
     * of `parseInt`.
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} string The string to convert.
     * @param {number} [radix] The radix to interpret `value` by.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {number} Returns the converted integer.
     * @example
     *
     * _.parseInt('08');
     * // => 8
     *
     * _.map(['6', '08', '10'], _.parseInt);
     * // => [6, 8, 10]
     */
    function parseInt(string, radix, guard) {
      if (guard && isIterateeCall(string, radix, guard)) {
        radix = 0;
      }
      return nativeParseInt(string, radix);
    }
    // Fallback for environments with pre-ES5 implementations.
    if (nativeParseInt(whitespace + '08') != 8) {
      parseInt = function(string, radix, guard) {
        // Firefox < 21 and Opera < 15 follow ES3 for `parseInt`.
        // Chrome fails to trim leading <BOM> whitespace characters.
        // See https://code.google.com/p/v8/issues/detail?id=3109 for more details.
        if (guard ? isIterateeCall(string, radix, guard) : radix == null) {
          radix = 0;
        } else if (radix) {
          radix = +radix;
        }
        string = trim(string);
        return nativeParseInt(string, radix || (reHasHexPrefix.test(string) ? 16 : 10));
      };
    }

    /**
     * Repeats the given string `n` times.
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to repeat.
     * @param {number} [n=0] The number of times to repeat the string.
     * @returns {string} Returns the repeated string.
     * @example
     *
     * _.repeat('*', 3);
     * // => '***'
     *
     * _.repeat('abc', 2);
     * // => 'abcabc'
     *
     * _.repeat('abc', 0);
     * // => ''
     */
    function repeat(string, n) {
      var result = '';
      string = baseToString(string);
      n = +n;
      if (n < 1 || !string || !nativeIsFinite(n)) {
        return result;
      }
      // Leverage the exponentiation by squaring algorithm for a faster repeat.
      // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
      do {
        if (n % 2) {
          result += string;
        }
        n = floor(n / 2);
        string += string;
      } while (n);

      return result;
    }

    /**
     * Converts `string` to [snake case](https://en.wikipedia.org/wiki/Snake_case).
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to convert.
     * @returns {string} Returns the snake cased string.
     * @example
     *
     * _.snakeCase('Foo Bar');
     * // => 'foo_bar'
     *
     * _.snakeCase('fooBar');
     * // => 'foo_bar'
     *
     * _.snakeCase('--foo-bar');
     * // => 'foo_bar'
     */
    var snakeCase = createCompounder(function(result, word, index) {
      return result + (index ? '_' : '') + word.toLowerCase();
    });

    /**
     * Converts `string` to [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage).
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to convert.
     * @returns {string} Returns the start cased string.
     * @example
     *
     * _.startCase('--foo-bar');
     * // => 'Foo Bar'
     *
     * _.startCase('fooBar');
     * // => 'Foo Bar'
     *
     * _.startCase('__foo_bar__');
     * // => 'Foo Bar'
     */
    var startCase = createCompounder(function(result, word, index) {
      return result + (index ? ' ' : '') + (word.charAt(0).toUpperCase() + word.slice(1));
    });

    /**
     * Checks if `string` starts with the given target string.
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to search.
     * @param {string} [target] The string to search for.
     * @param {number} [position=0] The position to search from.
     * @returns {boolean} Returns `true` if `string` starts with `target`, else `false`.
     * @example
     *
     * _.startsWith('abc', 'a');
     * // => true
     *
     * _.startsWith('abc', 'b');
     * // => false
     *
     * _.startsWith('abc', 'b', 1);
     * // => true
     */
    function startsWith(string, target, position) {
      string = baseToString(string);
      position = position == null
        ? 0
        : nativeMin(position < 0 ? 0 : (+position || 0), string.length);

      return string.lastIndexOf(target, position) == position;
    }

    /**
     * Creates a compiled template function that can interpolate data properties
     * in "interpolate" delimiters, HTML-escape interpolated data properties in
     * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data
     * properties may be accessed as free variables in the template. If a setting
     * object is provided it takes precedence over `_.templateSettings` values.
     *
     * **Note:** In the development build `_.template` utilizes
     * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
     * for easier debugging.
     *
     * For more information on precompiling templates see
     * [lodash's custom builds documentation](https://lodash.com/custom-builds).
     *
     * For more information on Chrome extension sandboxes see
     * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The template string.
     * @param {Object} [options] The options object.
     * @param {RegExp} [options.escape] The HTML "escape" delimiter.
     * @param {RegExp} [options.evaluate] The "evaluate" delimiter.
     * @param {Object} [options.imports] An object to import into the template as free variables.
     * @param {RegExp} [options.interpolate] The "interpolate" delimiter.
     * @param {string} [options.sourceURL] The sourceURL of the template's compiled source.
     * @param {string} [options.variable] The data object variable name.
     * @param- {Object} [otherOptions] Enables the legacy `options` param signature.
     * @returns {Function} Returns the compiled template function.
     * @example
     *
     * // using the "interpolate" delimiter to create a compiled template
     * var compiled = _.template('hello <%= user %>!');
     * compiled({ 'user': 'fred' });
     * // => 'hello fred!'
     *
     * // using the HTML "escape" delimiter to escape data property values
     * var compiled = _.template('<b><%- value %></b>');
     * compiled({ 'value': '<script>' });
     * // => '<b>&lt;script&gt;</b>'
     *
     * // using the "evaluate" delimiter to execute JavaScript and generate HTML
     * var compiled = _.template('<% _.forEach(users, function(user) { %><li><%- user %></li><% }); %>');
     * compiled({ 'users': ['fred', 'barney'] });
     * // => '<li>fred</li><li>barney</li>'
     *
     * // using the internal `print` function in "evaluate" delimiters
     * var compiled = _.template('<% print("hello " + user); %>!');
     * compiled({ 'user': 'barney' });
     * // => 'hello barney!'
     *
     * // using the ES delimiter as an alternative to the default "interpolate" delimiter
     * var compiled = _.template('hello ${ user }!');
     * compiled({ 'user': 'pebbles' });
     * // => 'hello pebbles!'
     *
     * // using custom template delimiters
     * _.templateSettings.interpolate = /{{([\s\S]+?)}}/g;
     * var compiled = _.template('hello {{ user }}!');
     * compiled({ 'user': 'mustache' });
     * // => 'hello mustache!'
     *
     * // using backslashes to treat delimiters as plain text
     * var compiled = _.template('<%= "\\<%- value %\\>" %>');
     * compiled({ 'value': 'ignored' });
     * // => '<%- value %>'
     *
     * // using the `imports` option to import `jQuery` as `jq`
     * var text = '<% jq.each(users, function(user) { %><li><%- user %></li><% }); %>';
     * var compiled = _.template(text, { 'imports': { 'jq': jQuery } });
     * compiled({ 'users': ['fred', 'barney'] });
     * // => '<li>fred</li><li>barney</li>'
     *
     * // using the `sourceURL` option to specify a custom sourceURL for the template
     * var compiled = _.template('hello <%= user %>!', { 'sourceURL': '/basic/greeting.jst' });
     * compiled(data);
     * // => find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector
     *
     * // using the `variable` option to ensure a with-statement isn't used in the compiled template
     * var compiled = _.template('hi <%= data.user %>!', { 'variable': 'data' });
     * compiled.source;
     * // => function(data) {
     * //   var __t, __p = '';
     * //   __p += 'hi ' + ((__t = ( data.user )) == null ? '' : __t) + '!';
     * //   return __p;
     * // }
     *
     * // using the `source` property to inline compiled templates for meaningful
     * // line numbers in error messages and a stack trace
     * fs.writeFileSync(path.join(cwd, 'jst.js'), '\
     *   var JST = {\
     *     "main": ' + _.template(mainText).source + '\
     *   };\
     * ');
     */
    function template(string, options, otherOptions) {
      // Based on John Resig's `tmpl` implementation (http://ejohn.org/blog/javascript-micro-templating/)
      // and Laura Doktorova's doT.js (https://github.com/olado/doT).
      var settings = lodash.templateSettings;

      if (otherOptions && isIterateeCall(string, options, otherOptions)) {
        options = otherOptions = null;
      }
      string = baseToString(string);
      options = assignWith(baseAssign({}, otherOptions || options), settings, assignOwnDefaults);

      var imports = assignWith(baseAssign({}, options.imports), settings.imports, assignOwnDefaults),
          importsKeys = keys(imports),
          importsValues = baseValues(imports, importsKeys);

      var isEscaping,
          isEvaluating,
          index = 0,
          interpolate = options.interpolate || reNoMatch,
          source = "__p += '";

      // Compile the regexp to match each delimiter.
      var reDelimiters = RegExp(
        (options.escape || reNoMatch).source + '|' +
        interpolate.source + '|' +
        (interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' +
        (options.evaluate || reNoMatch).source + '|$'
      , 'g');

      // Use a sourceURL for easier debugging.
      var sourceURL = '//# sourceURL=' +
        ('sourceURL' in options
          ? options.sourceURL
          : ('lodash.templateSources[' + (++templateCounter) + ']')
        ) + '\n';

      string.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
        interpolateValue || (interpolateValue = esTemplateValue);

        // Escape characters that can't be included in string literals.
        source += string.slice(index, offset).replace(reUnescapedString, escapeStringChar);

        // Replace delimiters with snippets.
        if (escapeValue) {
          isEscaping = true;
          source += "' +\n__e(" + escapeValue + ") +\n'";
        }
        if (evaluateValue) {
          isEvaluating = true;
          source += "';\n" + evaluateValue + ";\n__p += '";
        }
        if (interpolateValue) {
          source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'";
        }
        index = offset + match.length;

        // The JS engine embedded in Adobe products requires returning the `match`
        // string in order to produce the correct `offset` value.
        return match;
      });

      source += "';\n";

      // If `variable` is not specified wrap a with-statement around the generated
      // code to add the data object to the top of the scope chain.
      var variable = options.variable;
      if (!variable) {
        source = 'with (obj) {\n' + source + '\n}\n';
      }
      // Cleanup code by stripping empty strings.
      source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
        .replace(reEmptyStringMiddle, '$1')
        .replace(reEmptyStringTrailing, '$1;');

      // Frame code as the function body.
      source = 'function(' + (variable || 'obj') + ') {\n' +
        (variable
          ? ''
          : 'obj || (obj = {});\n'
        ) +
        "var __t, __p = ''" +
        (isEscaping
           ? ', __e = _.escape'
           : ''
        ) +
        (isEvaluating
          ? ', __j = Array.prototype.join;\n' +
            "function print() { __p += __j.call(arguments, '') }\n"
          : ';\n'
        ) +
        source +
        'return __p\n}';

      var result = attempt(function() {
        return Function(importsKeys, sourceURL + 'return ' + source).apply(undefined, importsValues);
      });

      // Provide the compiled function's source by its `toString` method or
      // the `source` property as a convenience for inlining compiled templates.
      result.source = source;
      if (isError(result)) {
        throw result;
      }
      return result;
    }

    /**
     * Removes leading and trailing whitespace or specified characters from `string`.
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to trim.
     * @param {string} [chars=whitespace] The characters to trim.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {string} Returns the trimmed string.
     * @example
     *
     * _.trim('  abc  ');
     * // => 'abc'
     *
     * _.trim('-_-abc-_-', '_-');
     * // => 'abc'
     *
     * _.map(['  foo  ', '  bar  '], _.trim);
     * // => ['foo', 'bar']
     */
    function trim(string, chars, guard) {
      var value = string;
      string = baseToString(string);
      if (!string) {
        return string;
      }
      if (guard ? isIterateeCall(value, chars, guard) : chars == null) {
        return string.slice(trimmedLeftIndex(string), trimmedRightIndex(string) + 1);
      }
      chars = (chars + '');
      return string.slice(charsLeftIndex(string, chars), charsRightIndex(string, chars) + 1);
    }

    /**
     * Removes leading whitespace or specified characters from `string`.
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to trim.
     * @param {string} [chars=whitespace] The characters to trim.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {string} Returns the trimmed string.
     * @example
     *
     * _.trimLeft('  abc  ');
     * // => 'abc  '
     *
     * _.trimLeft('-_-abc-_-', '_-');
     * // => 'abc-_-'
     */
    function trimLeft(string, chars, guard) {
      var value = string;
      string = baseToString(string);
      if (!string) {
        return string;
      }
      if (guard ? isIterateeCall(value, chars, guard) : chars == null) {
        return string.slice(trimmedLeftIndex(string));
      }
      return string.slice(charsLeftIndex(string, (chars + '')));
    }

    /**
     * Removes trailing whitespace or specified characters from `string`.
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to trim.
     * @param {string} [chars=whitespace] The characters to trim.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {string} Returns the trimmed string.
     * @example
     *
     * _.trimRight('  abc  ');
     * // => '  abc'
     *
     * _.trimRight('-_-abc-_-', '_-');
     * // => '-_-abc'
     */
    function trimRight(string, chars, guard) {
      var value = string;
      string = baseToString(string);
      if (!string) {
        return string;
      }
      if (guard ? isIterateeCall(value, chars, guard) : chars == null) {
        return string.slice(0, trimmedRightIndex(string) + 1);
      }
      return string.slice(0, charsRightIndex(string, (chars + '')) + 1);
    }

    /**
     * Truncates `string` if it is longer than the given maximum string length.
     * The last characters of the truncated string are replaced with the omission
     * string which defaults to "...".
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to truncate.
     * @param {Object|number} [options] The options object or maximum string length.
     * @param {number} [options.length=30] The maximum string length.
     * @param {string} [options.omission='...'] The string to indicate text is omitted.
     * @param {RegExp|string} [options.separator] The separator pattern to truncate to.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {string} Returns the truncated string.
     * @example
     *
     * _.trunc('hi-diddly-ho there, neighborino');
     * // => 'hi-diddly-ho there, neighbo...'
     *
     * _.trunc('hi-diddly-ho there, neighborino', 24);
     * // => 'hi-diddly-ho there, n...'
     *
     * _.trunc('hi-diddly-ho there, neighborino', {
     *   'length': 24,
     *   'separator': ' '
     * });
     * // => 'hi-diddly-ho there,...'
     *
     * _.trunc('hi-diddly-ho there, neighborino', {
     *   'length': 24,
     *   'separator': /,? +/
     * });
     * // => 'hi-diddly-ho there...'
     *
     * _.trunc('hi-diddly-ho there, neighborino', {
     *   'omission': ' [...]'
     * });
     * // => 'hi-diddly-ho there, neig [...]'
     */
    function trunc(string, options, guard) {
      if (guard && isIterateeCall(string, options, guard)) {
        options = null;
      }
      var length = DEFAULT_TRUNC_LENGTH,
          omission = DEFAULT_TRUNC_OMISSION;

      if (options != null) {
        if (isObject(options)) {
          var separator = 'separator' in options ? options.separator : separator;
          length = 'length' in options ? (+options.length || 0) : length;
          omission = 'omission' in options ? baseToString(options.omission) : omission;
        } else {
          length = +options || 0;
        }
      }
      string = baseToString(string);
      if (length >= string.length) {
        return string;
      }
      var end = length - omission.length;
      if (end < 1) {
        return omission;
      }
      var result = string.slice(0, end);
      if (separator == null) {
        return result + omission;
      }
      if (isRegExp(separator)) {
        if (string.slice(end).search(separator)) {
          var match,
              newEnd,
              substring = string.slice(0, end);

          if (!separator.global) {
            separator = RegExp(separator.source, (reFlags.exec(separator) || '') + 'g');
          }
          separator.lastIndex = 0;
          while ((match = separator.exec(substring))) {
            newEnd = match.index;
          }
          result = result.slice(0, newEnd == null ? end : newEnd);
        }
      } else if (string.indexOf(separator, end) != end) {
        var index = result.lastIndexOf(separator);
        if (index > -1) {
          result = result.slice(0, index);
        }
      }
      return result + omission;
    }

    /**
     * The inverse of `_.escape`; this method converts the HTML entities
     * `&amp;`, `&lt;`, `&gt;`, `&quot;`, `&#39;`, and `&#96;` in `string` to their
     * corresponding characters.
     *
     * **Note:** No other HTML entities are unescaped. To unescape additional HTML
     * entities use a third-party library like [_he_](https://mths.be/he).
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to unescape.
     * @returns {string} Returns the unescaped string.
     * @example
     *
     * _.unescape('fred, barney, &amp; pebbles');
     * // => 'fred, barney, & pebbles'
     */
    function unescape(string) {
      string = baseToString(string);
      return (string && reHasEscapedHtml.test(string))
        ? string.replace(reEscapedHtml, unescapeHtmlChar)
        : string;
    }

    /**
     * Splits `string` into an array of its words.
     *
     * @static
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to inspect.
     * @param {RegExp|string} [pattern] The pattern to match words.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {Array} Returns the words of `string`.
     * @example
     *
     * _.words('fred, barney, & pebbles');
     * // => ['fred', 'barney', 'pebbles']
     *
     * _.words('fred, barney, & pebbles', /[^, ]+/g);
     * // => ['fred', 'barney', '&', 'pebbles']
     */
    function words(string, pattern, guard) {
      if (guard && isIterateeCall(string, pattern, guard)) {
        pattern = null;
      }
      string = baseToString(string);
      return string.match(pattern || reWords) || [];
    }

    /*------------------------------------------------------------------------*/

    /**
     * Attempts to invoke `func`, returning either the result or the caught error
     * object. Any additional arguments are provided to `func` when it is invoked.
     *
     * @static
     * @memberOf _
     * @category Utility
     * @param {Function} func The function to attempt.
     * @returns {*} Returns the `func` result or error object.
     * @example
     *
     * // avoid throwing errors for invalid selectors
     * var elements = _.attempt(function(selector) {
     *   return document.querySelectorAll(selector);
     * }, '>_>');
     *
     * if (_.isError(elements)) {
     *   elements = [];
     * }
     */
    var attempt = restParam(function(func, args) {
      try {
        return func.apply(undefined, args);
      } catch(e) {
        return isError(e) ? e : new Error(e);
      }
    });

    /**
     * Creates a function that invokes `func` with the `this` binding of `thisArg`
     * and arguments of the created function. If `func` is a property name the
     * created callback returns the property value for a given element. If `func`
     * is an object the created callback returns `true` for elements that contain
     * the equivalent object properties, otherwise it returns `false`.
     *
     * @static
     * @memberOf _
     * @alias iteratee
     * @category Utility
     * @param {*} [func=_.identity] The value to convert to a callback.
     * @param {*} [thisArg] The `this` binding of `func`.
     * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
     * @returns {Function} Returns the callback.
     * @example
     *
     * var users = [
     *   { 'user': 'barney', 'age': 36 },
     *   { 'user': 'fred',   'age': 40 }
     * ];
     *
     * // wrap to create custom callback shorthands
     * _.callback = _.wrap(_.callback, function(callback, func, thisArg) {
     *   var match = /^(.+?)__([gl]t)(.+)$/.exec(func);
     *   if (!match) {
     *     return callback(func, thisArg);
     *   }
     *   return function(object) {
     *     return match[2] == 'gt'
     *       ? object[match[1]] > match[3]
     *       : object[match[1]] < match[3];
     *   };
     * });
     *
     * _.filter(users, 'age__gt36');
     * // => [{ 'user': 'fred', 'age': 40 }]
     */
    function callback(func, thisArg, guard) {
      if (guard && isIterateeCall(func, thisArg, guard)) {
        thisArg = null;
      }
      return baseCallback(func, thisArg);
    }

    /**
     * Creates a function that returns `value`.
     *
     * @static
     * @memberOf _
     * @category Utility
     * @param {*} value The value to return from the new function.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var object = { 'user': 'fred' };
     * var getter = _.constant(object);
     *
     * getter() === object;
     * // => true
     */
    function constant(value) {
      return function() {
        return value;
      };
    }

    /**
     * This method returns the first argument provided to it.
     *
     * @static
     * @memberOf _
     * @category Utility
     * @param {*} value Any value.
     * @returns {*} Returns `value`.
     * @example
     *
     * var object = { 'user': 'fred' };
     *
     * _.identity(object) === object;
     * // => true
     */
    function identity(value) {
      return value;
    }

    /**
     * Creates a function which performs a deep comparison between a given object
     * and `source`, returning `true` if the given object has equivalent property
     * values, else `false`.
     *
     * **Note:** This method supports comparing arrays, booleans, `Date` objects,
     * numbers, `Object` objects, regexes, and strings. Objects are compared by
     * their own, not inherited, enumerable properties. For comparing a single
     * own or inherited property value see `_.matchesProperty`.
     *
     * @static
     * @memberOf _
     * @category Utility
     * @param {Object} source The object of property values to match.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var users = [
     *   { 'user': 'barney', 'age': 36, 'active': true },
     *   { 'user': 'fred',   'age': 40, 'active': false }
     * ];
     *
     * _.filter(users, _.matches({ 'age': 40, 'active': false }));
     * // => [{ 'user': 'fred', 'age': 40, 'active': false }]
     */
    function matches(source) {
      return baseMatches(baseClone(source, true));
    }

    /**
     * Creates a function which compares the property value of `path` on a given
     * object to `value`.
     *
     * **Note:** This method supports comparing arrays, booleans, `Date` objects,
     * numbers, `Object` objects, regexes, and strings. Objects are compared by
     * their own, not inherited, enumerable properties.
     *
     * @static
     * @memberOf _
     * @category Utility
     * @param {Array|string} path The path of the property to get.
     * @param {*} value The value to compare.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var users = [
     *   { 'user': 'barney' },
     *   { 'user': 'fred' }
     * ];
     *
     * _.find(users, _.matchesProperty('user', 'fred'));
     * // => { 'user': 'fred' }
     */
    function matchesProperty(path, value) {
      return baseMatchesProperty(path, baseClone(value, true));
    }

    /**
     * Creates a function which invokes the method at `path` on a given object.
     *
     * @static
     * @memberOf _
     * @category Utility
     * @param {Array|string} path The path of the method to invoke.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var objects = [
     *   { 'a': { 'b': { 'c': _.constant(2) } } },
     *   { 'a': { 'b': { 'c': _.constant(1) } } }
     * ];
     *
     * _.map(objects, _.method('a.b.c'));
     * // => [2, 1]
     *
     * _.invoke(_.sortBy(objects, _.method(['a', 'b', 'c'])), 'a.b.c');
     * // => [1, 2]
     */
    var method = restParam(function(path, args) {
      return function(object) {
        return invokePath(object, path, args);
      }
    });

    /**
     * The opposite of `_.method`; this method creates a function which invokes
     * the method at a given path on `object`.
     *
     * @static
     * @memberOf _
     * @category Utility
     * @param {Object} object The object to query.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var array = _.times(3, _.constant),
     *     object = { 'a': array, 'b': array, 'c': array };
     *
     * _.map(['a[2]', 'c[0]'], _.methodOf(object));
     * // => [2, 0]
     *
     * _.map([['a', '2'], ['c', '0']], _.methodOf(object));
     * // => [2, 0]
     */
    var methodOf = restParam(function(object, args) {
      return function(path) {
        return invokePath(object, path, args);
      };
    });

    /**
     * Adds all own enumerable function properties of a source object to the
     * destination object. If `object` is a function then methods are added to
     * its prototype as well.
     *
     * **Note:** Use `_.runInContext` to create a pristine `lodash` function to
     * avoid conflicts caused by modifying the original.
     *
     * @static
     * @memberOf _
     * @category Utility
     * @param {Function|Object} [object=lodash] The destination object.
     * @param {Object} source The object of functions to add.
     * @param {Object} [options] The options object.
     * @param {boolean} [options.chain=true] Specify whether the functions added
     *  are chainable.
     * @returns {Function|Object} Returns `object`.
     * @example
     *
     * function vowels(string) {
     *   return _.filter(string, function(v) {
     *     return /[aeiou]/i.test(v);
     *   });
     * }
     *
     * // use `_.runInContext` to avoid conflicts (esp. in Node.js)
     * var _ = require('lodash').runInContext();
     *
     * _.mixin({ 'vowels': vowels });
     * _.vowels('fred');
     * // => ['e']
     *
     * _('fred').vowels().value();
     * // => ['e']
     *
     * _.mixin({ 'vowels': vowels }, { 'chain': false });
     * _('fred').vowels();
     * // => ['e']
     */
    function mixin(object, source, options) {
      if (options == null) {
        var isObj = isObject(source),
            props = isObj && keys(source),
            methodNames = props && props.length && baseFunctions(source, props);

        if (!(methodNames ? methodNames.length : isObj)) {
          methodNames = false;
          options = source;
          source = object;
          object = this;
        }
      }
      if (!methodNames) {
        methodNames = baseFunctions(source, keys(source));
      }
      var chain = true,
          index = -1,
          isFunc = isFunction(object),
          length = methodNames.length;

      if (options === false) {
        chain = false;
      } else if (isObject(options) && 'chain' in options) {
        chain = options.chain;
      }
      while (++index < length) {
        var methodName = methodNames[index],
            func = source[methodName];

        object[methodName] = func;
        if (isFunc) {
          object.prototype[methodName] = (function(func) {
            return function() {
              var chainAll = this.__chain__;
              if (chain || chainAll) {
                var result = object(this.__wrapped__),
                    actions = result.__actions__ = arrayCopy(this.__actions__);

                actions.push({ 'func': func, 'args': arguments, 'thisArg': object });
                result.__chain__ = chainAll;
                return result;
              }
              var args = [this.value()];
              push.apply(args, arguments);
              return func.apply(object, args);
            };
          }(func));
        }
      }
      return object;
    }

    /**
     * Reverts the `_` variable to its previous value and returns a reference to
     * the `lodash` function.
     *
     * @static
     * @memberOf _
     * @category Utility
     * @returns {Function} Returns the `lodash` function.
     * @example
     *
     * var lodash = _.noConflict();
     */
    function noConflict() {
      context._ = oldDash;
      return this;
    }

    /**
     * A no-operation function which returns `undefined` regardless of the
     * arguments it receives.
     *
     * @static
     * @memberOf _
     * @category Utility
     * @example
     *
     * var object = { 'user': 'fred' };
     *
     * _.noop(object) === undefined;
     * // => true
     */
    function noop() {
      // No operation performed.
    }

    /**
     * Creates a function which returns the property value at `path` on a
     * given object.
     *
     * @static
     * @memberOf _
     * @category Utility
     * @param {Array|string} path The path of the property to get.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var objects = [
     *   { 'a': { 'b': { 'c': 2 } } },
     *   { 'a': { 'b': { 'c': 1 } } }
     * ];
     *
     * _.map(objects, _.property('a.b.c'));
     * // => [2, 1]
     *
     * _.pluck(_.sortBy(objects, _.property(['a', 'b', 'c'])), 'a.b.c');
     * // => [1, 2]
     */
    function property(path) {
      return isKey(path) ? baseProperty(path) : basePropertyDeep(path);
    }

    /**
     * The opposite of `_.property`; this method creates a function which returns
     * the property value at a given path on `object`.
     *
     * @static
     * @memberOf _
     * @category Utility
     * @param {Object} object The object to query.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var array = [0, 1, 2],
     *     object = { 'a': array, 'b': array, 'c': array };
     *
     * _.map(['a[2]', 'c[0]'], _.propertyOf(object));
     * // => [2, 0]
     *
     * _.map([['a', '2'], ['c', '0']], _.propertyOf(object));
     * // => [2, 0]
     */
    function propertyOf(object) {
      return function(path) {
        return baseGet(object, toPath(path), path + '');
      };
    }

    /**
     * Creates an array of numbers (positive and/or negative) progressing from
     * `start` up to, but not including, `end`. If `end` is not specified it is
     * set to `start` with `start` then set to `0`. If `end` is less than `start`
     * a zero-length range is created unless a negative `step` is specified.
     *
     * @static
     * @memberOf _
     * @category Utility
     * @param {number} [start=0] The start of the range.
     * @param {number} end The end of the range.
     * @param {number} [step=1] The value to increment or decrement by.
     * @returns {Array} Returns the new array of numbers.
     * @example
     *
     * _.range(4);
     * // => [0, 1, 2, 3]
     *
     * _.range(1, 5);
     * // => [1, 2, 3, 4]
     *
     * _.range(0, 20, 5);
     * // => [0, 5, 10, 15]
     *
     * _.range(0, -4, -1);
     * // => [0, -1, -2, -3]
     *
     * _.range(1, 4, 0);
     * // => [1, 1, 1]
     *
     * _.range(0);
     * // => []
     */
    function range(start, end, step) {
      if (step && isIterateeCall(start, end, step)) {
        end = step = null;
      }
      start = +start || 0;
      step = step == null ? 1 : (+step || 0);

      if (end == null) {
        end = start;
        start = 0;
      } else {
        end = +end || 0;
      }
      // Use `Array(length)` so engines like Chakra and V8 avoid slower modes.
      // See https://youtu.be/XAqIpGU8ZZk#t=17m25s for more details.
      var index = -1,
          length = nativeMax(ceil((end - start) / (step || 1)), 0),
          result = Array(length);

      while (++index < length) {
        result[index] = start;
        start += step;
      }
      return result;
    }

    /**
     * Invokes the iteratee function `n` times, returning an array of the results
     * of each invocation. The `iteratee` is bound to `thisArg` and invoked with
     * one argument; (index).
     *
     * @static
     * @memberOf _
     * @category Utility
     * @param {number} n The number of times to invoke `iteratee`.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {Array} Returns the array of results.
     * @example
     *
     * var diceRolls = _.times(3, _.partial(_.random, 1, 6, false));
     * // => [3, 6, 4]
     *
     * _.times(3, function(n) {
     *   mage.castSpell(n);
     * });
     * // => invokes `mage.castSpell(n)` three times with `n` of `0`, `1`, and `2`
     *
     * _.times(3, function(n) {
     *   this.cast(n);
     * }, mage);
     * // => also invokes `mage.castSpell(n)` three times
     */
    function times(n, iteratee, thisArg) {
      n = floor(n);

      // Exit early to avoid a JSC JIT bug in Safari 8
      // where `Array(0)` is treated as `Array(1)`.
      if (n < 1 || !nativeIsFinite(n)) {
        return [];
      }
      var index = -1,
          result = Array(nativeMin(n, MAX_ARRAY_LENGTH));

      iteratee = bindCallback(iteratee, thisArg, 1);
      while (++index < n) {
        if (index < MAX_ARRAY_LENGTH) {
          result[index] = iteratee(index);
        } else {
          iteratee(index);
        }
      }
      return result;
    }

    /**
     * Generates a unique ID. If `prefix` is provided the ID is appended to it.
     *
     * @static
     * @memberOf _
     * @category Utility
     * @param {string} [prefix] The value to prefix the ID with.
     * @returns {string} Returns the unique ID.
     * @example
     *
     * _.uniqueId('contact_');
     * // => 'contact_104'
     *
     * _.uniqueId();
     * // => '105'
     */
    function uniqueId(prefix) {
      var id = ++idCounter;
      return baseToString(prefix) + id;
    }

    /*------------------------------------------------------------------------*/

    /**
     * Adds two numbers.
     *
     * @static
     * @memberOf _
     * @category Math
     * @param {number} augend The first number to add.
     * @param {number} addend The second number to add.
     * @returns {number} Returns the sum.
     * @example
     *
     * _.add(6, 4);
     * // => 10
     */
    function add(augend, addend) {
      return (+augend || 0) + (+addend || 0);
    }

    /**
     * Gets the maximum value of `collection`. If `collection` is empty or falsey
     * `-Infinity` is returned. If an iteratee function is provided it is invoked
     * for each value in `collection` to generate the criterion by which the value
     * is ranked. The `iteratee` is bound to `thisArg` and invoked with three
     * arguments: (value, index, collection).
     *
     * If a property name is provided for `iteratee` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `iteratee` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Math
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function|Object|string} [iteratee] The function invoked per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {*} Returns the maximum value.
     * @example
     *
     * _.max([4, 2, 8, 6]);
     * // => 8
     *
     * _.max([]);
     * // => -Infinity
     *
     * var users = [
     *   { 'user': 'barney', 'age': 36 },
     *   { 'user': 'fred',   'age': 40 }
     * ];
     *
     * _.max(users, function(chr) {
     *   return chr.age;
     * });
     * // => { 'user': 'fred', 'age': 40 }
     *
     * // using the `_.property` callback shorthand
     * _.max(users, 'age');
     * // => { 'user': 'fred', 'age': 40 }
     */
    var max = createExtremum(arrayMax);

    /**
     * Gets the minimum value of `collection`. If `collection` is empty or falsey
     * `Infinity` is returned. If an iteratee function is provided it is invoked
     * for each value in `collection` to generate the criterion by which the value
     * is ranked. The `iteratee` is bound to `thisArg` and invoked with three
     * arguments: (value, index, collection).
     *
     * If a property name is provided for `iteratee` the created `_.property`
     * style callback returns the property value of the given element.
     *
     * If a value is also provided for `thisArg` the created `_.matchesProperty`
     * style callback returns `true` for elements that have a matching property
     * value, else `false`.
     *
     * If an object is provided for `iteratee` the created `_.matches` style
     * callback returns `true` for elements that have the properties of the given
     * object, else `false`.
     *
     * @static
     * @memberOf _
     * @category Math
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function|Object|string} [iteratee] The function invoked per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {*} Returns the minimum value.
     * @example
     *
     * _.min([4, 2, 8, 6]);
     * // => 2
     *
     * _.min([]);
     * // => Infinity
     *
     * var users = [
     *   { 'user': 'barney', 'age': 36 },
     *   { 'user': 'fred',   'age': 40 }
     * ];
     *
     * _.min(users, function(chr) {
     *   return chr.age;
     * });
     * // => { 'user': 'barney', 'age': 36 }
     *
     * // using the `_.property` callback shorthand
     * _.min(users, 'age');
     * // => { 'user': 'barney', 'age': 36 }
     */
    var min = createExtremum(arrayMin, true);

    /**
     * Gets the sum of the values in `collection`.
     *
     * @static
     * @memberOf _
     * @category Math
     * @param {Array|Object|string} collection The collection to iterate over.
     * @param {Function|Object|string} [iteratee] The function invoked per iteration.
     * @param {*} [thisArg] The `this` binding of `iteratee`.
     * @returns {number} Returns the sum.
     * @example
     *
     * _.sum([4, 6]);
     * // => 10
     *
     * _.sum({ 'a': 4, 'b': 6 });
     * // => 10
     *
     * var objects = [
     *   { 'n': 4 },
     *   { 'n': 6 }
     * ];
     *
     * _.sum(objects, function(object) {
     *   return object.n;
     * });
     * // => 10
     *
     * // using the `_.property` callback shorthand
     * _.sum(objects, 'n');
     * // => 10
     */
    function sum(collection, iteratee, thisArg) {
      if (thisArg && isIterateeCall(collection, iteratee, thisArg)) {
        iteratee = null;
      }
      var func = getCallback(),
          noIteratee = iteratee == null;

      if (!(func === baseCallback && noIteratee)) {
        noIteratee = false;
        iteratee = func(iteratee, thisArg, 3);
      }
      return noIteratee
        ? arraySum(isArray(collection) ? collection : toIterable(collection))
        : baseSum(collection, iteratee);
    }

    /*------------------------------------------------------------------------*/

    // Ensure wrappers are instances of `baseLodash`.
    lodash.prototype = baseLodash.prototype;

    LodashWrapper.prototype = baseCreate(baseLodash.prototype);
    LodashWrapper.prototype.constructor = LodashWrapper;

    LazyWrapper.prototype = baseCreate(baseLodash.prototype);
    LazyWrapper.prototype.constructor = LazyWrapper;

    // Add functions to the `Map` cache.
    MapCache.prototype['delete'] = mapDelete;
    MapCache.prototype.get = mapGet;
    MapCache.prototype.has = mapHas;
    MapCache.prototype.set = mapSet;

    // Add functions to the `Set` cache.
    SetCache.prototype.push = cachePush;

    // Assign cache to `_.memoize`.
    memoize.Cache = MapCache;

    // Add functions that return wrapped values when chaining.
    lodash.after = after;
    lodash.ary = ary;
    lodash.assign = assign;
    lodash.at = at;
    lodash.before = before;
    lodash.bind = bind;
    lodash.bindAll = bindAll;
    lodash.bindKey = bindKey;
    lodash.callback = callback;
    lodash.chain = chain;
    lodash.chunk = chunk;
    lodash.compact = compact;
    lodash.constant = constant;
    lodash.countBy = countBy;
    lodash.create = create;
    lodash.curry = curry;
    lodash.curryRight = curryRight;
    lodash.debounce = debounce;
    lodash.defaults = defaults;
    lodash.defer = defer;
    lodash.delay = delay;
    lodash.difference = difference;
    lodash.drop = drop;
    lodash.dropRight = dropRight;
    lodash.dropRightWhile = dropRightWhile;
    lodash.dropWhile = dropWhile;
    lodash.fill = fill;
    lodash.filter = filter;
    lodash.flatten = flatten;
    lodash.flattenDeep = flattenDeep;
    lodash.flow = flow;
    lodash.flowRight = flowRight;
    lodash.forEach = forEach;
    lodash.forEachRight = forEachRight;
    lodash.forIn = forIn;
    lodash.forInRight = forInRight;
    lodash.forOwn = forOwn;
    lodash.forOwnRight = forOwnRight;
    lodash.functions = functions;
    lodash.groupBy = groupBy;
    lodash.indexBy = indexBy;
    lodash.initial = initial;
    lodash.intersection = intersection;
    lodash.invert = invert;
    lodash.invoke = invoke;
    lodash.keys = keys;
    lodash.keysIn = keysIn;
    lodash.map = map;
    lodash.mapValues = mapValues;
    lodash.matches = matches;
    lodash.matchesProperty = matchesProperty;
    lodash.memoize = memoize;
    lodash.merge = merge;
    lodash.method = method;
    lodash.methodOf = methodOf;
    lodash.mixin = mixin;
    lodash.negate = negate;
    lodash.omit = omit;
    lodash.once = once;
    lodash.pairs = pairs;
    lodash.partial = partial;
    lodash.partialRight = partialRight;
    lodash.partition = partition;
    lodash.pick = pick;
    lodash.pluck = pluck;
    lodash.property = property;
    lodash.propertyOf = propertyOf;
    lodash.pull = pull;
    lodash.pullAt = pullAt;
    lodash.range = range;
    lodash.rearg = rearg;
    lodash.reject = reject;
    lodash.remove = remove;
    lodash.rest = rest;
    lodash.restParam = restParam;
    lodash.set = set;
    lodash.shuffle = shuffle;
    lodash.slice = slice;
    lodash.sortBy = sortBy;
    lodash.sortByAll = sortByAll;
    lodash.sortByOrder = sortByOrder;
    lodash.spread = spread;
    lodash.take = take;
    lodash.takeRight = takeRight;
    lodash.takeRightWhile = takeRightWhile;
    lodash.takeWhile = takeWhile;
    lodash.tap = tap;
    lodash.throttle = throttle;
    lodash.thru = thru;
    lodash.times = times;
    lodash.toArray = toArray;
    lodash.toPlainObject = toPlainObject;
    lodash.transform = transform;
    lodash.union = union;
    lodash.uniq = uniq;
    lodash.unzip = unzip;
    lodash.values = values;
    lodash.valuesIn = valuesIn;
    lodash.where = where;
    lodash.without = without;
    lodash.wrap = wrap;
    lodash.xor = xor;
    lodash.zip = zip;
    lodash.zipObject = zipObject;

    // Add aliases.
    lodash.backflow = flowRight;
    lodash.collect = map;
    lodash.compose = flowRight;
    lodash.each = forEach;
    lodash.eachRight = forEachRight;
    lodash.extend = assign;
    lodash.iteratee = callback;
    lodash.methods = functions;
    lodash.object = zipObject;
    lodash.select = filter;
    lodash.tail = rest;
    lodash.unique = uniq;

    // Add functions to `lodash.prototype`.
    mixin(lodash, lodash);

    /*------------------------------------------------------------------------*/

    // Add functions that return unwrapped values when chaining.
    lodash.add = add;
    lodash.attempt = attempt;
    lodash.camelCase = camelCase;
    lodash.capitalize = capitalize;
    lodash.clone = clone;
    lodash.cloneDeep = cloneDeep;
    lodash.deburr = deburr;
    lodash.endsWith = endsWith;
    lodash.escape = escape;
    lodash.escapeRegExp = escapeRegExp;
    lodash.every = every;
    lodash.find = find;
    lodash.findIndex = findIndex;
    lodash.findKey = findKey;
    lodash.findLast = findLast;
    lodash.findLastIndex = findLastIndex;
    lodash.findLastKey = findLastKey;
    lodash.findWhere = findWhere;
    lodash.first = first;
    lodash.get = get;
    lodash.has = has;
    lodash.identity = identity;
    lodash.includes = includes;
    lodash.indexOf = indexOf;
    lodash.inRange = inRange;
    lodash.isArguments = isArguments;
    lodash.isArray = isArray;
    lodash.isBoolean = isBoolean;
    lodash.isDate = isDate;
    lodash.isElement = isElement;
    lodash.isEmpty = isEmpty;
    lodash.isEqual = isEqual;
    lodash.isError = isError;
    lodash.isFinite = isFinite;
    lodash.isFunction = isFunction;
    lodash.isMatch = isMatch;
    lodash.isNaN = isNaN;
    lodash.isNative = isNative;
    lodash.isNull = isNull;
    lodash.isNumber = isNumber;
    lodash.isObject = isObject;
    lodash.isPlainObject = isPlainObject;
    lodash.isRegExp = isRegExp;
    lodash.isString = isString;
    lodash.isTypedArray = isTypedArray;
    lodash.isUndefined = isUndefined;
    lodash.kebabCase = kebabCase;
    lodash.last = last;
    lodash.lastIndexOf = lastIndexOf;
    lodash.max = max;
    lodash.min = min;
    lodash.noConflict = noConflict;
    lodash.noop = noop;
    lodash.now = now;
    lodash.pad = pad;
    lodash.padLeft = padLeft;
    lodash.padRight = padRight;
    lodash.parseInt = parseInt;
    lodash.random = random;
    lodash.reduce = reduce;
    lodash.reduceRight = reduceRight;
    lodash.repeat = repeat;
    lodash.result = result;
    lodash.runInContext = runInContext;
    lodash.size = size;
    lodash.snakeCase = snakeCase;
    lodash.some = some;
    lodash.sortedIndex = sortedIndex;
    lodash.sortedLastIndex = sortedLastIndex;
    lodash.startCase = startCase;
    lodash.startsWith = startsWith;
    lodash.sum = sum;
    lodash.template = template;
    lodash.trim = trim;
    lodash.trimLeft = trimLeft;
    lodash.trimRight = trimRight;
    lodash.trunc = trunc;
    lodash.unescape = unescape;
    lodash.uniqueId = uniqueId;
    lodash.words = words;

    // Add aliases.
    lodash.all = every;
    lodash.any = some;
    lodash.contains = includes;
    lodash.detect = find;
    lodash.foldl = reduce;
    lodash.foldr = reduceRight;
    lodash.head = first;
    lodash.include = includes;
    lodash.inject = reduce;

    mixin(lodash, (function() {
      var source = {};
      baseForOwn(lodash, function(func, methodName) {
        if (!lodash.prototype[methodName]) {
          source[methodName] = func;
        }
      });
      return source;
    }()), false);

    /*------------------------------------------------------------------------*/

    // Add functions capable of returning wrapped and unwrapped values when chaining.
    lodash.sample = sample;

    lodash.prototype.sample = function(n) {
      if (!this.__chain__ && n == null) {
        return sample(this.value());
      }
      return this.thru(function(value) {
        return sample(value, n);
      });
    };

    /*------------------------------------------------------------------------*/

    /**
     * The semantic version number.
     *
     * @static
     * @memberOf _
     * @type string
     */
    lodash.VERSION = VERSION;

    // Assign default placeholders.
    arrayEach(['bind', 'bindKey', 'curry', 'curryRight', 'partial', 'partialRight'], function(methodName) {
      lodash[methodName].placeholder = lodash;
    });

    // Add `LazyWrapper` methods that accept an `iteratee` value.
    arrayEach(['dropWhile', 'filter', 'map', 'takeWhile'], function(methodName, type) {
      var isFilter = type != LAZY_MAP_FLAG,
          isDropWhile = type == LAZY_DROP_WHILE_FLAG;

      LazyWrapper.prototype[methodName] = function(iteratee, thisArg) {
        var filtered = this.__filtered__,
            result = (filtered && isDropWhile) ? new LazyWrapper(this) : this.clone(),
            iteratees = result.__iteratees__ || (result.__iteratees__ = []);

        iteratees.push({
          'done': false,
          'count': 0,
          'index': 0,
          'iteratee': getCallback(iteratee, thisArg, 1),
          'limit': -1,
          'type': type
        });

        result.__filtered__ = filtered || isFilter;
        return result;
      };
    });

    // Add `LazyWrapper` methods for `_.drop` and `_.take` variants.
    arrayEach(['drop', 'take'], function(methodName, index) {
      var whileName = methodName + 'While';

      LazyWrapper.prototype[methodName] = function(n) {
        var filtered = this.__filtered__,
            result = (filtered && !index) ? this.dropWhile() : this.clone();

        n = n == null ? 1 : nativeMax(floor(n) || 0, 0);
        if (filtered) {
          if (index) {
            result.__takeCount__ = nativeMin(result.__takeCount__, n);
          } else {
            last(result.__iteratees__).limit = n;
          }
        } else {
          var views = result.__views__ || (result.__views__ = []);
          views.push({ 'size': n, 'type': methodName + (result.__dir__ < 0 ? 'Right' : '') });
        }
        return result;
      };

      LazyWrapper.prototype[methodName + 'Right'] = function(n) {
        return this.reverse()[methodName](n).reverse();
      };

      LazyWrapper.prototype[methodName + 'RightWhile'] = function(predicate, thisArg) {
        return this.reverse()[whileName](predicate, thisArg).reverse();
      };
    });

    // Add `LazyWrapper` methods for `_.first` and `_.last`.
    arrayEach(['first', 'last'], function(methodName, index) {
      var takeName = 'take' + (index ? 'Right' : '');

      LazyWrapper.prototype[methodName] = function() {
        return this[takeName](1).value()[0];
      };
    });

    // Add `LazyWrapper` methods for `_.initial` and `_.rest`.
    arrayEach(['initial', 'rest'], function(methodName, index) {
      var dropName = 'drop' + (index ? '' : 'Right');

      LazyWrapper.prototype[methodName] = function() {
        return this[dropName](1);
      };
    });

    // Add `LazyWrapper` methods for `_.pluck` and `_.where`.
    arrayEach(['pluck', 'where'], function(methodName, index) {
      var operationName = index ? 'filter' : 'map',
          createCallback = index ? baseMatches : property;

      LazyWrapper.prototype[methodName] = function(value) {
        return this[operationName](createCallback(value));
      };
    });

    LazyWrapper.prototype.compact = function() {
      return this.filter(identity);
    };

    LazyWrapper.prototype.reject = function(predicate, thisArg) {
      predicate = getCallback(predicate, thisArg, 1);
      return this.filter(function(value) {
        return !predicate(value);
      });
    };

    LazyWrapper.prototype.slice = function(start, end) {
      start = start == null ? 0 : (+start || 0);
      var result = start < 0 ? this.takeRight(-start) : this.drop(start);

      if (end !== undefined) {
        end = (+end || 0);
        result = end < 0 ? result.dropRight(-end) : result.take(end - start);
      }
      return result;
    };

    LazyWrapper.prototype.toArray = function() {
      return this.drop(0);
    };

    // Add `LazyWrapper` methods to `lodash.prototype`.
    baseForOwn(LazyWrapper.prototype, function(func, methodName) {
      var lodashFunc = lodash[methodName];
      if (!lodashFunc) {
        return;
      }
      var checkIteratee = /^(?:filter|map|reject)|While$/.test(methodName),
          retUnwrapped = /^(?:first|last)$/.test(methodName);

      lodash.prototype[methodName] = function() {
        var args = arguments,
            length = args.length,
            chainAll = this.__chain__,
            value = this.__wrapped__,
            isHybrid = !!this.__actions__.length,
            isLazy = value instanceof LazyWrapper,
            iteratee = args[0],
            useLazy = isLazy || isArray(value);

        if (useLazy && checkIteratee && typeof iteratee == 'function' && iteratee.length != 1) {
          // avoid lazy use if the iteratee has a "length" value other than `1`
          isLazy = useLazy = false;
        }
        var onlyLazy = isLazy && !isHybrid;
        if (retUnwrapped && !chainAll) {
          return onlyLazy
            ? func.call(value)
            : lodashFunc.call(lodash, this.value());
        }
        var interceptor = function(value) {
          var otherArgs = [value];
          push.apply(otherArgs, args);
          return lodashFunc.apply(lodash, otherArgs);
        };
        if (useLazy) {
          var wrapper = onlyLazy ? value : new LazyWrapper(this),
              result = func.apply(wrapper, args);

          if (!retUnwrapped && (isHybrid || result.__actions__)) {
            var actions = result.__actions__ || (result.__actions__ = []);
            actions.push({ 'func': thru, 'args': [interceptor], 'thisArg': lodash });
          }
          return new LodashWrapper(result, chainAll);
        }
        return this.thru(interceptor);
      };
    });

    // Add `Array` and `String` methods to `lodash.prototype`.
    arrayEach(['concat', 'join', 'pop', 'push', 'replace', 'shift', 'sort', 'splice', 'split', 'unshift'], function(methodName) {
      var func = (/^(?:replace|split)$/.test(methodName) ? stringProto : arrayProto)[methodName],
          chainName = /^(?:push|sort|unshift)$/.test(methodName) ? 'tap' : 'thru',
          retUnwrapped = /^(?:join|pop|replace|shift)$/.test(methodName);

      lodash.prototype[methodName] = function() {
        var args = arguments;
        if (retUnwrapped && !this.__chain__) {
          return func.apply(this.value(), args);
        }
        return this[chainName](function(value) {
          return func.apply(value, args);
        });
      };
    });

    // Map minified function names to their real names.
    baseForOwn(LazyWrapper.prototype, function(func, methodName) {
      var lodashFunc = lodash[methodName];
      if (lodashFunc) {
        var key = lodashFunc.name,
            names = realNames[key] || (realNames[key] = []);

        names.push({ 'name': methodName, 'func': lodashFunc });
      }
    });

    realNames[createHybridWrapper(null, BIND_KEY_FLAG).name] = [{ 'name': 'wrapper', 'func': null }];

    // Add functions to the lazy wrapper.
    LazyWrapper.prototype.clone = lazyClone;
    LazyWrapper.prototype.reverse = lazyReverse;
    LazyWrapper.prototype.value = lazyValue;

    // Add chaining functions to the `lodash` wrapper.
    lodash.prototype.chain = wrapperChain;
    lodash.prototype.commit = wrapperCommit;
    lodash.prototype.plant = wrapperPlant;
    lodash.prototype.reverse = wrapperReverse;
    lodash.prototype.toString = wrapperToString;
    lodash.prototype.run = lodash.prototype.toJSON = lodash.prototype.valueOf = lodash.prototype.value = wrapperValue;

    // Add function aliases to the `lodash` wrapper.
    lodash.prototype.collect = lodash.prototype.map;
    lodash.prototype.head = lodash.prototype.first;
    lodash.prototype.select = lodash.prototype.filter;
    lodash.prototype.tail = lodash.prototype.rest;

    return lodash;
  }

  /*--------------------------------------------------------------------------*/

  // Export lodash.
  var _ = runInContext();

  // Some AMD build optimizers like r.js check for condition patterns like the following:
  if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
    // Expose lodash to the global object when an AMD loader is present to avoid
    // errors in cases where lodash is loaded by a script tag and not intended
    // as an AMD module. See http://requirejs.org/docs/errors.html#mismatch for
    // more details.
    root._ = _;

    // Define as an anonymous module so, through path mapping, it can be
    // referenced as the "underscore" module.
    define(function() {
      return _;
    });
  }
  // Check for `exports` after `define` in case a build optimizer adds an `exports` object.
  else if (freeExports && freeModule) {
    // Export for Node.js or RingoJS.
    if (moduleExports) {
      (freeModule.exports = _)._ = _;
    }
    // Export for Narwhal or Rhino -require.
    else {
      freeExports._ = _;
    }
  }
  else {
    // Export for a browser or Rhino.
    root._ = _;
  }
}.call(this));

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],13:[function(require,module,exports){
/*
 * Lexical analysis and token construction.
 */

"use strict";

var _      = require("lodash");
var events = require("events");
var reg    = require("./reg.js");
var state  = require("./state.js").state;

var unicodeData = require("../data/ascii-identifier-data.js");
var asciiIdentifierStartTable = unicodeData.asciiIdentifierStartTable;
var asciiIdentifierPartTable = unicodeData.asciiIdentifierPartTable;
var nonAsciiIdentifierStartTable = require("../data/non-ascii-identifier-start.js");
var nonAsciiIdentifierPartTable = require("../data/non-ascii-identifier-part-only.js");

// Some of these token types are from JavaScript Parser API
// while others are specific to JSHint parser.
// JS Parser API: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API

var Token = {
  Identifier: 1,
  Punctuator: 2,
  NumericLiteral: 3,
  StringLiteral: 4,
  Comment: 5,
  Keyword: 6,
  NullLiteral: 7,
  BooleanLiteral: 8,
  RegExp: 9,
  TemplateHead: 10,
  TemplateMiddle: 11,
  TemplateTail: 12,
  NoSubstTemplate: 13
};

var Context = {
  Block: 1,
  Template: 2
};

// Object that handles postponed lexing verifications that checks the parsed
// environment state.

function asyncTrigger() {
  var _checks = [];

  return {
    push: function(fn) {
      _checks.push(fn);
    },

    check: function() {
      for (var check = 0; check < _checks.length; ++check) {
        _checks[check]();
      }

      _checks.splice(0, _checks.length);
    }
  };
}

/*
 * Lexer for JSHint.
 *
 * This object does a char-by-char scan of the provided source code
 * and produces a sequence of tokens.
 *
 *   var lex = new Lexer("var i = 0;");
 *   lex.start();
 *   lex.token(); // returns the next token
 *
 * You have to use the token() method to move the lexer forward
 * but you don't have to use its return value to get tokens. In addition
 * to token() method returning the next token, the Lexer object also
 * emits events.
 *
 *   lex.on("Identifier", function(data) {
 *     if (data.name.indexOf("_") >= 0) {
 *       // Produce a warning.
 *     }
 *   });
 *
 * Note that the token() method returns tokens in a JSLint-compatible
 * format while the event emitter uses a slightly modified version of
 * Mozilla's JavaScript Parser API. Eventually, we will move away from
 * JSLint format.
 */
function Lexer(source) {
  var lines = source;

  if (typeof lines === "string") {
    lines = lines
      .replace(/\r\n/g, "\n")
      .replace(/\r/g, "\n")
      .split("\n");
  }

  // If the first line is a shebang (#!), make it a blank and move on.
  // Shebangs are used by Node scripts.

  if (lines[0] && lines[0].substr(0, 2) === "#!") {
    if (lines[0].indexOf("node") !== -1) {
      state.option.node = true;
    }
    lines[0] = "";
  }

  this.emitter = new events.EventEmitter();
  this.source = source;
  this.setLines(lines);
  this.prereg = true;

  this.line = 0;
  this.char = 1;
  this.from = 1;
  this.input = "";
  this.inComment = false;
  this.context = [];
  this.templateStarts = [];

  for (var i = 0; i < state.option.indent; i += 1) {
    state.tab += " ";
  }
}

Lexer.prototype = {
  _lines: [],

  inContext: function(ctxType) {
    return this.context.length > 0 && this.context[this.context.length - 1].type === ctxType;
  },

  pushContext: function(ctxType) {
    this.context.push({ type: ctxType });
  },

  popContext: function() {
    return this.context.pop();
  },

  isContext: function(context) {
    return this.context.length > 0 && this.context[this.context.length - 1] === context;
  },

  currentContext: function() {
    return this.context.length > 0 && this.context[this.context.length - 1];
  },

  getLines: function() {
    this._lines = state.lines;
    return this._lines;
  },

  setLines: function(val) {
    this._lines = val;
    state.lines = this._lines;
  },

  /*
   * Return the next i character without actually moving the
   * char pointer.
   */
  peek: function(i) {
    return this.input.charAt(i || 0);
  },

  /*
   * Move the char pointer forward i times.
   */
  skip: function(i) {
    i = i || 1;
    this.char += i;
    this.input = this.input.slice(i);
  },

  /*
   * Subscribe to a token event. The API for this method is similar
   * Underscore.js i.e. you can subscribe to multiple events with
   * one call:
   *
   *   lex.on("Identifier Number", function(data) {
   *     // ...
   *   });
   */
  on: function(names, listener) {
    names.split(" ").forEach(function(name) {
      this.emitter.on(name, listener);
    }.bind(this));
  },

  /*
   * Trigger a token event. All arguments will be passed to each
   * listener.
   */
  trigger: function() {
    this.emitter.emit.apply(this.emitter, Array.prototype.slice.call(arguments));
  },

  /*
   * Postpone a token event. the checking condition is set as
   * last parameter, and the trigger function is called in a
   * stored callback. To be later called using the check() function
   * by the parser. This avoids parser's peek() to give the lexer
   * a false context.
   */
  triggerAsync: function(type, args, checks, fn) {
    checks.push(function() {
      if (fn()) {
        this.trigger(type, args);
      }
    }.bind(this));
  },

  /*
   * Extract a punctuator out of the next sequence of characters
   * or return 'null' if its not possible.
   *
   * This method's implementation was heavily influenced by the
   * scanPunctuator function in the Esprima parser's source code.
   */
  scanPunctuator: function() {
    var ch1 = this.peek();
    var ch2, ch3, ch4;

    switch (ch1) {
    // Most common single-character punctuators
    case ".":
      if ((/^[0-9]$/).test(this.peek(1))) {
        return null;
      }
      if (this.peek(1) === "." && this.peek(2) === ".") {
        return {
          type: Token.Punctuator,
          value: "..."
        };
      }
      /* falls through */
    case "(":
    case ")":
    case ";":
    case ",":
    case "[":
    case "]":
    case ":":
    case "~":
    case "?":
      return {
        type: Token.Punctuator,
        value: ch1
      };

    // A block/object opener
    case "{":
      this.pushContext(Context.Block);
      return {
        type: Token.Punctuator,
        value: ch1
      };

    // A block/object closer
    case "}":
      if (this.inContext(Context.Block)) {
        this.popContext();
      }
      return {
        type: Token.Punctuator,
        value: ch1
      };

    // A pound sign (for Node shebangs)
    case "#":
      return {
        type: Token.Punctuator,
        value: ch1
      };

    // We're at the end of input
    case "":
      return null;
    }

    // Peek more characters

    ch2 = this.peek(1);
    ch3 = this.peek(2);
    ch4 = this.peek(3);

    // 4-character punctuator: >>>=

    if (ch1 === ">" && ch2 === ">" && ch3 === ">" && ch4 === "=") {
      return {
        type: Token.Punctuator,
        value: ">>>="
      };
    }

    // 3-character punctuators: === !== >>> <<= >>=

    if (ch1 === "=" && ch2 === "=" && ch3 === "=") {
      return {
        type: Token.Punctuator,
        value: "==="
      };
    }

    if (ch1 === "!" && ch2 === "=" && ch3 === "=") {
      return {
        type: Token.Punctuator,
        value: "!=="
      };
    }

    if (ch1 === ">" && ch2 === ">" && ch3 === ">") {
      return {
        type: Token.Punctuator,
        value: ">>>"
      };
    }

    if (ch1 === "<" && ch2 === "<" && ch3 === "=") {
      return {
        type: Token.Punctuator,
        value: "<<="
      };
    }

    if (ch1 === ">" && ch2 === ">" && ch3 === "=") {
      return {
        type: Token.Punctuator,
        value: ">>="
      };
    }

    // Fat arrow punctuator
    if (ch1 === "=" && ch2 === ">") {
      return {
        type: Token.Punctuator,
        value: ch1 + ch2
      };
    }

    // 2-character punctuators: <= >= == != ++ -- << >> && ||
    // += -= *= %= &= |= ^= /=
    if (ch1 === ch2 && ("+-<>&|".indexOf(ch1) >= 0)) {
      return {
        type: Token.Punctuator,
        value: ch1 + ch2
      };
    }

    if ("<>=!+-*%&|^/".indexOf(ch1) >= 0) {
      if (ch2 === "=") {
        return {
          type: Token.Punctuator,
          value: ch1 + ch2
        };
      }

      return {
        type: Token.Punctuator,
        value: ch1
      };
    }

    return null;
  },

  /*
   * Extract a comment out of the next sequence of characters and/or
   * lines or return 'null' if its not possible. Since comments can
   * span across multiple lines this method has to move the char
   * pointer.
   *
   * In addition to normal JavaScript comments (// and /*) this method
   * also recognizes JSHint- and JSLint-specific comments such as
   * /*jshint, /*jslint, /*globals and so on.
   */
  scanComments: function() {
    var ch1 = this.peek();
    var ch2 = this.peek(1);
    var rest = this.input.substr(2);
    var startLine = this.line;
    var startChar = this.char;
    var self = this;

    // Create a comment token object and make sure it
    // has all the data JSHint needs to work with special
    // comments.

    function commentToken(label, body, opt) {
      var special = ["jshint", "jslint", "members", "member", "globals", "global", "exported"];
      var isSpecial = false;
      var value = label + body;
      var commentType = "plain";
      opt = opt || {};

      if (opt.isMultiline) {
        value += "*/";
      }

      body = body.replace(/\n/g, " ");

      if (label === "/*" && reg.fallsThrough.test(body)) {
        isSpecial = true;
        commentType = "falls through";
      }

      special.forEach(function(str) {
        if (isSpecial) {
          return;
        }

        // Don't recognize any special comments other than jshint for single-line
        // comments. This introduced many problems with legit comments.
        if (label === "//" && str !== "jshint") {
          return;
        }

        if (body.charAt(str.length) === " " && body.substr(0, str.length) === str) {
          isSpecial = true;
          label = label + str;
          body = body.substr(str.length);
        }

        if (!isSpecial && body.charAt(0) === " " && body.charAt(str.length + 1) === " " &&
          body.substr(1, str.length) === str) {
          isSpecial = true;
          label = label + " " + str;
          body = body.substr(str.length + 1);
        }

        if (!isSpecial) {
          return;
        }

        switch (str) {
        case "member":
          commentType = "members";
          break;
        case "global":
          commentType = "globals";
          break;
        default:
          var options = body.split(":").map(function(v) {
            return v.replace(/^\s+/, "").replace(/\s+$/, "");
          });

          if (options.length === 2) {
            switch (options[0]) {
            case "ignore":
              switch (options[1]) {
              case "start":
                self.ignoringLinterErrors = true;
                isSpecial = false;
                break;
              case "end":
                self.ignoringLinterErrors = false;
                isSpecial = false;
                break;
              }
            }
          }

          commentType = str;
        }
      });

      return {
        type: Token.Comment,
        commentType: commentType,
        value: value,
        body: body,
        isSpecial: isSpecial,
        isMultiline: opt.isMultiline || false,
        isMalformed: opt.isMalformed || false
      };
    }

    // End of unbegun comment. Raise an error and skip that input.
    if (ch1 === "*" && ch2 === "/") {
      this.trigger("error", {
        code: "E018",
        line: startLine,
        character: startChar
      });

      this.skip(2);
      return null;
    }

    // Comments must start either with // or /*
    if (ch1 !== "/" || (ch2 !== "*" && ch2 !== "/")) {
      return null;
    }

    // One-line comment
    if (ch2 === "/") {
      this.skip(this.input.length); // Skip to the EOL.
      return commentToken("//", rest);
    }

    var body = "";

    /* Multi-line comment */
    if (ch2 === "*") {
      this.inComment = true;
      this.skip(2);

      while (this.peek() !== "*" || this.peek(1) !== "/") {
        if (this.peek() === "") { // End of Line
          body += "\n";

          // If we hit EOF and our comment is still unclosed,
          // trigger an error and end the comment implicitly.
          if (!this.nextLine()) {
            this.trigger("error", {
              code: "E017",
              line: startLine,
              character: startChar
            });

            this.inComment = false;
            return commentToken("/*", body, {
              isMultiline: true,
              isMalformed: true
            });
          }
        } else {
          body += this.peek();
          this.skip();
        }
      }

      this.skip(2);
      this.inComment = false;
      return commentToken("/*", body, { isMultiline: true });
    }
  },

  /*
   * Extract a keyword out of the next sequence of characters or
   * return 'null' if its not possible.
   */
  scanKeyword: function() {
    var result = /^[a-zA-Z_$][a-zA-Z0-9_$]*/.exec(this.input);
    var keywords = [
      "if", "in", "do", "var", "for", "new",
      "try", "let", "this", "else", "case",
      "void", "with", "enum", "while", "break",
      "catch", "throw", "const", "yield", "class",
      "super", "return", "typeof", "delete",
      "switch", "export", "import", "default",
      "finally", "extends", "function", "continue",
      "debugger", "instanceof"
    ];

    if (result && keywords.indexOf(result[0]) >= 0) {
      return {
        type: Token.Keyword,
        value: result[0]
      };
    }

    return null;
  },

  /*
   * Extract a JavaScript identifier out of the next sequence of
   * characters or return 'null' if its not possible. In addition,
   * to Identifier this method can also produce BooleanLiteral
   * (true/false) and NullLiteral (null).
   */
  scanIdentifier: function() {
    var id = "";
    var index = 0;
    var type, char;

    function isNonAsciiIdentifierStart(code) {
      return nonAsciiIdentifierStartTable.indexOf(code) > -1;
    }

    function isNonAsciiIdentifierPart(code) {
      return isNonAsciiIdentifierStart(code) || nonAsciiIdentifierPartTable.indexOf(code) > -1;
    }

    function isHexDigit(str) {
      return (/^[0-9a-fA-F]$/).test(str);
    }

    var readUnicodeEscapeSequence = function() {
      /*jshint validthis:true */
      index += 1;

      if (this.peek(index) !== "u") {
        return null;
      }

      var ch1 = this.peek(index + 1);
      var ch2 = this.peek(index + 2);
      var ch3 = this.peek(index + 3);
      var ch4 = this.peek(index + 4);
      var code;

      if (isHexDigit(ch1) && isHexDigit(ch2) && isHexDigit(ch3) && isHexDigit(ch4)) {
        code = parseInt(ch1 + ch2 + ch3 + ch4, 16);

        if (asciiIdentifierPartTable[code] || isNonAsciiIdentifierPart(code)) {
          index += 5;
          return "\\u" + ch1 + ch2 + ch3 + ch4;
        }

        return null;
      }

      return null;
    }.bind(this);

    var getIdentifierStart = function() {
      /*jshint validthis:true */
      var chr = this.peek(index);
      var code = chr.charCodeAt(0);

      if (code === 92) {
        return readUnicodeEscapeSequence();
      }

      if (code < 128) {
        if (asciiIdentifierStartTable[code]) {
          index += 1;
          return chr;
        }

        return null;
      }

      if (isNonAsciiIdentifierStart(code)) {
        index += 1;
        return chr;
      }

      return null;
    }.bind(this);

    var getIdentifierPart = function() {
      /*jshint validthis:true */
      var chr = this.peek(index);
      var code = chr.charCodeAt(0);

      if (code === 92) {
        return readUnicodeEscapeSequence();
      }

      if (code < 128) {
        if (asciiIdentifierPartTable[code]) {
          index += 1;
          return chr;
        }

        return null;
      }

      if (isNonAsciiIdentifierPart(code)) {
        index += 1;
        return chr;
      }

      return null;
    }.bind(this);

    function removeEscapeSequences(id) {
      return id.replace(/\\u([0-9a-fA-F]{4})/g, function(m0, codepoint) {
        return String.fromCharCode(parseInt(codepoint, 16));
      });
    }

    char = getIdentifierStart();
    if (char === null) {
      return null;
    }

    id = char;
    for (;;) {
      char = getIdentifierPart();

      if (char === null) {
        break;
      }

      id += char;
    }

    switch (id) {
    case "true":
    case "false":
      type = Token.BooleanLiteral;
      break;
    case "null":
      type = Token.NullLiteral;
      break;
    default:
      type = Token.Identifier;
    }

    return {
      type: type,
      value: removeEscapeSequences(id),
      text: id,
      tokenLength: id.length
    };
  },

  /*
   * Extract a numeric literal out of the next sequence of
   * characters or return 'null' if its not possible. This method
   * supports all numeric literals described in section 7.8.3
   * of the EcmaScript 5 specification.
   *
   * This method's implementation was heavily influenced by the
   * scanNumericLiteral function in the Esprima parser's source code.
   */
  scanNumericLiteral: function() {
    var index = 0;
    var value = "";
    var length = this.input.length;
    var char = this.peek(index);
    var bad;
    var isAllowedDigit = isDecimalDigit;
    var base = 10;
    var isLegacy = false;

    function isDecimalDigit(str) {
      return (/^[0-9]$/).test(str);
    }

    function isOctalDigit(str) {
      return (/^[0-7]$/).test(str);
    }

    function isBinaryDigit(str) {
      return (/^[01]$/).test(str);
    }

    function isHexDigit(str) {
      return (/^[0-9a-fA-F]$/).test(str);
    }

    function isIdentifierStart(ch) {
      return (ch === "$") || (ch === "_") || (ch === "\\") ||
        (ch >= "a" && ch <= "z") || (ch >= "A" && ch <= "Z");
    }

    // Numbers must start either with a decimal digit or a point.

    if (char !== "." && !isDecimalDigit(char)) {
      return null;
    }

    if (char !== ".") {
      value = this.peek(index);
      index += 1;
      char = this.peek(index);

      if (value === "0") {
        // Base-16 numbers.
        if (char === "x" || char === "X") {
          isAllowedDigit = isHexDigit;
          base = 16;

          index += 1;
          value += char;
        }

        // Base-8 numbers.
        if (char === "o" || char === "O") {
          isAllowedDigit = isOctalDigit;
          base = 8;

          if (!state.inES6(true)) {
            this.trigger("warning", {
              code: "W119",
              line: this.line,
              character: this.char,
              data: [ "Octal integer literal", "6" ]
            });
          }

          index += 1;
          value += char;
        }

        // Base-2 numbers.
        if (char === "b" || char === "B") {
          isAllowedDigit = isBinaryDigit;
          base = 2;

          if (!state.inES6(true)) {
            this.trigger("warning", {
              code: "W119",
              line: this.line,
              character: this.char,
              data: [ "Binary integer literal", "6" ]
            });
          }

          index += 1;
          value += char;
        }

        // Legacy base-8 numbers.
        if (isOctalDigit(char)) {
          isAllowedDigit = isOctalDigit;
          base = 8;
          isLegacy = true;
          bad = false;

          index += 1;
          value += char;
        }

        // Decimal numbers that start with '0' such as '09' are illegal
        // but we still parse them and return as malformed.

        if (!isOctalDigit(char) && isDecimalDigit(char)) {
          index += 1;
          value += char;
        }
      }

      while (index < length) {
        char = this.peek(index);

        if (isLegacy && isDecimalDigit(char)) {
          // Numbers like '019' (note the 9) are not valid octals
          // but we still parse them and mark as malformed.
          bad = true;
        } else if (!isAllowedDigit(char)) {
          break;
        }
        value += char;
        index += 1;
      }

      if (isAllowedDigit !== isDecimalDigit) {
        if (!isLegacy && value.length <= 2) { // 0x
          return {
            type: Token.NumericLiteral,
            value: value,
            isMalformed: true
          };
        }

        if (index < length) {
          char = this.peek(index);
          if (isIdentifierStart(char)) {
            return null;
          }
        }

        return {
          type: Token.NumericLiteral,
          value: value,
          base: base,
          isLegacy: isLegacy,
          isMalformed: false
        };
      }
    }

    // Decimal digits.

    if (char === ".") {
      value += char;
      index += 1;

      while (index < length) {
        char = this.peek(index);
        if (!isDecimalDigit(char)) {
          break;
        }
        value += char;
        index += 1;
      }
    }

    // Exponent part.

    if (char === "e" || char === "E") {
      value += char;
      index += 1;
      char = this.peek(index);

      if (char === "+" || char === "-") {
        value += this.peek(index);
        index += 1;
      }

      char = this.peek(index);
      if (isDecimalDigit(char)) {
        value += char;
        index += 1;

        while (index < length) {
          char = this.peek(index);
          if (!isDecimalDigit(char)) {
            break;
          }
          value += char;
          index += 1;
        }
      } else {
        return null;
      }
    }

    if (index < length) {
      char = this.peek(index);
      if (isIdentifierStart(char)) {
        return null;
      }
    }

    return {
      type: Token.NumericLiteral,
      value: value,
      base: base,
      isMalformed: !isFinite(value)
    };
  },


  // Assumes previously parsed character was \ (=== '\\') and was not skipped.
  scanEscapeSequence: function(checks) {
    var allowNewLine = false;
    var jump = 1;
    this.skip();
    var char = this.peek();

    switch (char) {
    case "'":
      this.triggerAsync("warning", {
        code: "W114",
        line: this.line,
        character: this.char,
        data: [ "\\'" ]
      }, checks, function() {return state.jsonMode; });
      break;
    case "b":
      char = "\\b";
      break;
    case "f":
      char = "\\f";
      break;
    case "n":
      char = "\\n";
      break;
    case "r":
      char = "\\r";
      break;
    case "t":
      char = "\\t";
      break;
    case "0":
      char = "\\0";

      // Octal literals fail in strict mode.
      // Check if the number is between 00 and 07.
      var n = parseInt(this.peek(1), 10);
      this.triggerAsync("warning", {
        code: "W115",
        line: this.line,
        character: this.char
      }, checks,
      function() { return n >= 0 && n <= 7 && state.isStrict(); });
      break;
    case "u":
      var hexCode = this.input.substr(1, 4);
      var code = parseInt(hexCode, 16);
      if (isNaN(code)) {
        this.trigger("warning", {
          code: "W052",
          line: this.line,
          character: this.char,
          data: [ "u" + hexCode ]
        });
      }
      char = String.fromCharCode(code);
      jump = 5;
      break;
    case "v":
      this.triggerAsync("warning", {
        code: "W114",
        line: this.line,
        character: this.char,
        data: [ "\\v" ]
      }, checks, function() { return state.jsonMode; });

      char = "\v";
      break;
    case "x":
      var  x = parseInt(this.input.substr(1, 2), 16);

      this.triggerAsync("warning", {
        code: "W114",
        line: this.line,
        character: this.char,
        data: [ "\\x-" ]
      }, checks, function() { return state.jsonMode; });

      char = String.fromCharCode(x);
      jump = 3;
      break;
    case "\\":
      char = "\\\\";
      break;
    case "\"":
      char = "\\\"";
      break;
    case "/":
      break;
    case "":
      allowNewLine = true;
      char = "";
      break;
    }

    return { char: char, jump: jump, allowNewLine: allowNewLine };
  },

  /*
   * Extract a template literal out of the next sequence of characters
   * and/or lines or return 'null' if its not possible. Since template
   * literals can span across multiple lines, this method has to move
   * the char pointer.
   */
  scanTemplateLiteral: function(checks) {
    var tokenType;
    var value = "";
    var ch;
    var startLine = this.line;
    var startChar = this.char;
    var depth = this.templateStarts.length;

    if (this.peek() === "`") {
      if (!state.inES6(true)) {
        this.trigger("warning", {
          code: "W119",
          line: this.line,
          character: this.char,
          data: ["template literal syntax", "6"]
        });
      }
      // Template must start with a backtick.
      tokenType = Token.TemplateHead;
      this.templateStarts.push({ line: this.line, char: this.char });
      depth = this.templateStarts.length;
      this.skip(1);
      this.pushContext(Context.Template);
    } else if (this.inContext(Context.Template) && this.peek() === "}") {
      // If we're in a template context, and we have a '}', lex a TemplateMiddle.
      tokenType = Token.TemplateMiddle;
    } else {
      // Go lex something else.
      return null;
    }

    while (this.peek() !== "`") {
      while ((ch = this.peek()) === "") {
        value += "\n";
        if (!this.nextLine()) {
          // Unclosed template literal --- point to the starting "`"
          var startPos = this.templateStarts.pop();
          this.trigger("error", {
            code: "E052",
            line: startPos.line,
            character: startPos.char
          });
          return {
            type: tokenType,
            value: value,
            startLine: startLine,
            startChar: startChar,
            isUnclosed: true,
            depth: depth,
            context: this.popContext()
          };
        }
      }

      if (ch === '$' && this.peek(1) === '{') {
        value += '${';
        this.skip(2);
        return {
          type: tokenType,
          value: value,
          startLine: startLine,
          startChar: startChar,
          isUnclosed: false,
          depth: depth,
          context: this.currentContext()
        };
      } else if (ch === '\\') {
        var escape = this.scanEscapeSequence(checks);
        value += escape.char;
        this.skip(escape.jump);
      } else if (ch !== '`') {
        // Otherwise, append the value and continue.
        value += ch;
        this.skip(1);
      }
    }

    // Final value is either NoSubstTemplate or TemplateTail
    tokenType = tokenType === Token.TemplateHead ? Token.NoSubstTemplate : Token.TemplateTail;
    this.skip(1);
    this.templateStarts.pop();

    return {
      type: tokenType,
      value: value,
      startLine: startLine,
      startChar: startChar,
      isUnclosed: false,
      depth: depth,
      context: this.popContext()
    };
  },

  /*
   * Extract a string out of the next sequence of characters and/or
   * lines or return 'null' if its not possible. Since strings can
   * span across multiple lines this method has to move the char
   * pointer.
   *
   * This method recognizes pseudo-multiline JavaScript strings:
   *
   *   var str = "hello\
   *   world";
   */
  scanStringLiteral: function(checks) {
    /*jshint loopfunc:true */
    var quote = this.peek();

    // String must start with a quote.
    if (quote !== "\"" && quote !== "'") {
      return null;
    }

    // In JSON strings must always use double quotes.
    this.triggerAsync("warning", {
      code: "W108",
      line: this.line,
      character: this.char // +1?
    }, checks, function() { return state.jsonMode && quote !== "\""; });

    var value = "";
    var startLine = this.line;
    var startChar = this.char;
    var allowNewLine = false;

    this.skip();

    while (this.peek() !== quote) {
      if (this.peek() === "") { // End Of Line

        // If an EOL is not preceded by a backslash, show a warning
        // and proceed like it was a legit multi-line string where
        // author simply forgot to escape the newline symbol.
        //
        // Another approach is to implicitly close a string on EOL
        // but it generates too many false positives.

        if (!allowNewLine) {
          this.trigger("warning", {
            code: "W112",
            line: this.line,
            character: this.char
          });
        } else {
          allowNewLine = false;

          // Otherwise show a warning if multistr option was not set.
          // For JSON, show warning no matter what.

          this.triggerAsync("warning", {
            code: "W043",
            line: this.line,
            character: this.char
          }, checks, function() { return !state.option.multistr; });

          this.triggerAsync("warning", {
            code: "W042",
            line: this.line,
            character: this.char
          }, checks, function() { return state.jsonMode && state.option.multistr; });
        }

        // If we get an EOF inside of an unclosed string, show an
        // error and implicitly close it at the EOF point.

        if (!this.nextLine()) {
          this.trigger("error", {
            code: "E029",
            line: startLine,
            character: startChar
          });

          return {
            type: Token.StringLiteral,
            value: value,
            startLine: startLine,
            startChar: startChar,
            isUnclosed: true,
            quote: quote
          };
        }

      } else { // Any character other than End Of Line

        allowNewLine = false;
        var char = this.peek();
        var jump = 1; // A length of a jump, after we're done
                      // parsing this character.

        if (char < " ") {
          // Warn about a control character in a string.
          this.trigger("warning", {
            code: "W113",
            line: this.line,
            character: this.char,
            data: [ "<non-printable>" ]
          });
        }

        // Special treatment for some escaped characters.
        if (char === "\\") {
          var parsed = this.scanEscapeSequence(checks);
          char = parsed.char;
          jump = parsed.jump;
          allowNewLine = parsed.allowNewLine;
        }

        value += char;
        this.skip(jump);
      }
    }

    this.skip();
    return {
      type: Token.StringLiteral,
      value: value,
      startLine: startLine,
      startChar: startChar,
      isUnclosed: false,
      quote: quote
    };
  },

  /*
   * Extract a regular expression out of the next sequence of
   * characters and/or lines or return 'null' if its not possible.
   *
   * This method is platform dependent: it accepts almost any
   * regular expression values but then tries to compile and run
   * them using system's RegExp object. This means that there are
   * rare edge cases where one JavaScript engine complains about
   * your regular expression while others don't.
   */
  scanRegExp: function() {
    var index = 0;
    var length = this.input.length;
    var char = this.peek();
    var value = char;
    var body = "";
    var flags = [];
    var malformed = false;
    var isCharSet = false;
    var terminated;

    var scanUnexpectedChars = function() {
      // Unexpected control character
      if (char < " ") {
        malformed = true;
        this.trigger("warning", {
          code: "W048",
          line: this.line,
          character: this.char
        });
      }

      // Unexpected escaped character
      if (char === "<") {
        malformed = true;
        this.trigger("warning", {
          code: "W049",
          line: this.line,
          character: this.char,
          data: [ char ]
        });
      }
    }.bind(this);

    // Regular expressions must start with '/'
    if (!this.prereg || char !== "/") {
      return null;
    }

    index += 1;
    terminated = false;

    // Try to get everything in between slashes. A couple of
    // cases aside (see scanUnexpectedChars) we don't really
    // care whether the resulting expression is valid or not.
    // We will check that later using the RegExp object.

    while (index < length) {
      char = this.peek(index);
      value += char;
      body += char;

      if (isCharSet) {
        if (char === "]") {
          if (this.peek(index - 1) !== "\\" || this.peek(index - 2) === "\\") {
            isCharSet = false;
          }
        }

        if (char === "\\") {
          index += 1;
          char = this.peek(index);
          body += char;
          value += char;

          scanUnexpectedChars();
        }

        index += 1;
        continue;
      }

      if (char === "\\") {
        index += 1;
        char = this.peek(index);
        body += char;
        value += char;

        scanUnexpectedChars();

        if (char === "/") {
          index += 1;
          continue;
        }

        if (char === "[") {
          index += 1;
          continue;
        }
      }

      if (char === "[") {
        isCharSet = true;
        index += 1;
        continue;
      }

      if (char === "/") {
        body = body.substr(0, body.length - 1);
        terminated = true;
        index += 1;
        break;
      }

      index += 1;
    }

    // A regular expression that was never closed is an
    // error from which we cannot recover.

    if (!terminated) {
      this.trigger("error", {
        code: "E015",
        line: this.line,
        character: this.from
      });

      return void this.trigger("fatal", {
        line: this.line,
        from: this.from
      });
    }

    // Parse flags (if any).

    while (index < length) {
      char = this.peek(index);
      if (!/[gim]/.test(char)) {
        break;
      }
      flags.push(char);
      value += char;
      index += 1;
    }

    // Check regular expression for correctness.

    try {
      new RegExp(body, flags.join(""));
    } catch (err) {
      malformed = true;
      this.trigger("error", {
        code: "E016",
        line: this.line,
        character: this.char,
        data: [ err.message ] // Platform dependent!
      });
    }

    return {
      type: Token.RegExp,
      value: value,
      flags: flags,
      isMalformed: malformed
    };
  },

  /*
   * Scan for any occurrence of non-breaking spaces. Non-breaking spaces
   * can be mistakenly typed on OS X with option-space. Non UTF-8 web
   * pages with non-breaking pages produce syntax errors.
   */
  scanNonBreakingSpaces: function() {
    return state.option.nonbsp ?
      this.input.search(/(\u00A0)/) : -1;
  },

  /*
   * Scan for characters that get silently deleted by one or more browsers.
   */
  scanUnsafeChars: function() {
    return this.input.search(reg.unsafeChars);
  },

  /*
   * Produce the next raw token or return 'null' if no tokens can be matched.
   * This method skips over all space characters.
   */
  next: function(checks) {
    this.from = this.char;

    // Move to the next non-space character.
    while (/\s/.test(this.peek())) {
      this.from += 1;
      this.skip();
    }

    // Methods that work with multi-line structures and move the
    // character pointer.

    var match = this.scanComments() ||
      this.scanStringLiteral(checks) ||
      this.scanTemplateLiteral(checks);

    if (match) {
      return match;
    }

    // Methods that don't move the character pointer.

    match =
      this.scanRegExp() ||
      this.scanPunctuator() ||
      this.scanKeyword() ||
      this.scanIdentifier() ||
      this.scanNumericLiteral();

    if (match) {
      this.skip(match.tokenLength || match.value.length);
      return match;
    }

    // No token could be matched, give up.

    return null;
  },

  /*
   * Switch to the next line and reset all char pointers. Once
   * switched, this method also checks for other minor warnings.
   */
  nextLine: function() {
    var char;

    if (this.line >= this.getLines().length) {
      return false;
    }

    this.input = this.getLines()[this.line];
    this.line += 1;
    this.char = 1;
    this.from = 1;

    var inputTrimmed = this.input.trim();

    var startsWith = function() {
      return _.some(arguments, function(prefix) {
        return inputTrimmed.indexOf(prefix) === 0;
      });
    };

    var endsWith = function() {
      return _.some(arguments, function(suffix) {
        return inputTrimmed.indexOf(suffix, inputTrimmed.length - suffix.length) !== -1;
      });
    };

    // If we are ignoring linter errors, replace the input with empty string
    // if it doesn't already at least start or end a multi-line comment
    if (this.ignoringLinterErrors === true) {
      if (!startsWith("/*", "//") && !(this.inComment && endsWith("*/"))) {
        this.input = "";
      }
    }

    char = this.scanNonBreakingSpaces();
    if (char >= 0) {
      this.trigger("warning", { code: "W125", line: this.line, character: char + 1 });
    }

    this.input = this.input.replace(/\t/g, state.tab);
    char = this.scanUnsafeChars();

    if (char >= 0) {
      this.trigger("warning", { code: "W100", line: this.line, character: char });
    }

    // If there is a limit on line length, warn when lines get too
    // long.

    if (!this.ignoringLinterErrors && state.option.maxlen &&
      state.option.maxlen < this.input.length) {
      var inComment = this.inComment ||
        startsWith.call(inputTrimmed, "//") ||
        startsWith.call(inputTrimmed, "/*");

      var shouldTriggerError = !inComment || !reg.maxlenException.test(inputTrimmed);

      if (shouldTriggerError) {
        this.trigger("warning", { code: "W101", line: this.line, character: this.input.length });
      }
    }

    return true;
  },

  /*
   * This is simply a synonym for nextLine() method with a friendlier
   * public name.
   */
  start: function() {
    this.nextLine();
  },

  /*
   * Produce the next token. This function is called by advance() to get
   * the next token. It returns a token in a JSLint-compatible format.
   */
  token: function() {
    /*jshint loopfunc:true */
    var checks = asyncTrigger();
    var token;


    function isReserved(token, isProperty) {
      if (!token.reserved) {
        return false;
      }
      var meta = token.meta;

      if (meta && meta.isFutureReservedWord && state.inES5()) {
        // ES3 FutureReservedWord in an ES5 environment.
        if (!meta.es5) {
          return false;
        }

        // Some ES5 FutureReservedWord identifiers are active only
        // within a strict mode environment.
        if (meta.strictOnly) {
          if (!state.option.strict && !state.isStrict()) {
            return false;
          }
        }

        if (isProperty) {
          return false;
        }
      }

      return true;
    }

    // Produce a token object.
    var create = function(type, value, isProperty, token) {
      /*jshint validthis:true */
      var obj;

      if (type !== "(endline)" && type !== "(end)") {
        this.prereg = false;
      }

      if (type === "(punctuator)") {
        switch (value) {
        case ".":
        case ")":
        case "~":
        case "#":
        case "]":
        case "++":
        case "--":
          this.prereg = false;
          break;
        default:
          this.prereg = true;
        }

        obj = Object.create(state.syntax[value] || state.syntax["(error)"]);
      }

      if (type === "(identifier)") {
        if (value === "return" || value === "case" ||
            value === "typeof" || value === "instanceof") {
          this.prereg = true;
        }

        if (_.has(state.syntax, value)) {
          obj = Object.create(state.syntax[value] || state.syntax["(error)"]);

          // If this can't be a reserved keyword, reset the object.
          if (!isReserved(obj, isProperty && type === "(identifier)")) {
            obj = null;
          }
        }
      }

      if (type === "(template)" || type === "(template middle)") {
        this.prereg = true;
      }

      if (!obj) {
        obj = Object.create(state.syntax[type]);
      }

      obj.identifier = (type === "(identifier)");
      obj.type = obj.type || type;
      obj.value = value;
      obj.line = this.line;
      obj.character = this.char;
      obj.from = this.from;
      if (obj.identifier && token) obj.raw_text = token.text || token.value;
      if (token && token.startLine && token.startLine !== this.line) {
        obj.startLine = token.startLine;
      }
      if (token && token.context) {
        // Context of current token
        obj.context = token.context;
      }
      if (token && token.depth) {
        // Nested template depth
        obj.depth = token.depth;
      }
      if (token && token.isUnclosed) {
        // Mark token as unclosed string / template literal
        obj.isUnclosed = token.isUnclosed;
      }

      if (isProperty && obj.identifier) {
        obj.isProperty = isProperty;
      }

      obj.check = checks.check;

      return obj;
    }.bind(this);

    for (;;) {
      if (!this.input.length) {
        if (this.nextLine()) {
          return create("(endline)", "");
        }

        if (this.exhausted) {
          return null;
        }

        this.exhausted = true;
        return create("(end)", "");
      }

      token = this.next(checks);

      if (!token) {
        if (this.input.length) {
          // Unexpected character.
          this.trigger("error", {
            code: "E024",
            line: this.line,
            character: this.char,
            data: [ this.peek() ]
          });

          this.input = "";
        }

        continue;
      }

      switch (token.type) {
      case Token.StringLiteral:
        this.triggerAsync("String", {
          line: this.line,
          char: this.char,
          from: this.from,
          startLine: token.startLine,
          startChar: token.startChar,
          value: token.value,
          quote: token.quote
        }, checks, function() { return true; });

        return create("(string)", token.value, null, token);

      case Token.TemplateHead:
        this.trigger("TemplateHead", {
          line: this.line,
          char: this.char,
          from: this.from,
          startLine: token.startLine,
          startChar: token.startChar,
          value: token.value
        });
        return create("(template)", token.value, null, token);

      case Token.TemplateMiddle:
        this.trigger("TemplateMiddle", {
          line: this.line,
          char: this.char,
          from: this.from,
          startLine: token.startLine,
          startChar: token.startChar,
          value: token.value
        });
        return create("(template middle)", token.value, null, token);

      case Token.TemplateTail:
        this.trigger("TemplateTail", {
          line: this.line,
          char: this.char,
          from: this.from,
          startLine: token.startLine,
          startChar: token.startChar,
          value: token.value
        });
        return create("(template tail)", token.value, null, token);

      case Token.NoSubstTemplate:
        this.trigger("NoSubstTemplate", {
          line: this.line,
          char: this.char,
          from: this.from,
          startLine: token.startLine,
          startChar: token.startChar,
          value: token.value
        });
        return create("(no subst template)", token.value, null, token);

      case Token.Identifier:
        this.triggerAsync("Identifier", {
          line: this.line,
          char: this.char,
          from: this.from,
          name: token.value,
          raw_name: token.text,
          isProperty: state.tokens.curr.id === "."
        }, checks, function() { return true; });

        /* falls through */
      case Token.Keyword:
      case Token.NullLiteral:
      case Token.BooleanLiteral:
        return create("(identifier)", token.value, state.tokens.curr.id === ".", token);

      case Token.NumericLiteral:
        if (token.isMalformed) {
          this.trigger("warning", {
            code: "W045",
            line: this.line,
            character: this.char,
            data: [ token.value ]
          });
        }

        this.triggerAsync("warning", {
          code: "W114",
          line: this.line,
          character: this.char,
          data: [ "0x-" ]
        }, checks, function() { return token.base === 16 && state.jsonMode; });

        this.triggerAsync("warning", {
          code: "W115",
          line: this.line,
          character: this.char
        }, checks, function() {
          return state.isStrict() && token.base === 8 && token.isLegacy;
        });

        this.trigger("Number", {
          line: this.line,
          char: this.char,
          from: this.from,
          value: token.value,
          base: token.base,
          isMalformed: token.malformed
        });

        return create("(number)", token.value);

      case Token.RegExp:
        return create("(regexp)", token.value);

      case Token.Comment:
        state.tokens.curr.comment = true;

        if (token.isSpecial) {
          return {
            id: '(comment)',
            value: token.value,
            body: token.body,
            type: token.commentType,
            isSpecial: token.isSpecial,
            line: this.line,
            character: this.char,
            from: this.from
          };
        }

        break;

      case "":
        break;

      default:
        return create("(punctuator)", token.value);
      }
    }
  }
};

exports.Lexer = Lexer;
exports.Context = Context;

},{"../data/ascii-identifier-data.js":1,"../data/non-ascii-identifier-part-only.js":2,"../data/non-ascii-identifier-start.js":3,"./reg.js":17,"./state.js":19,"events":5,"lodash":12}],14:[function(require,module,exports){
"use strict";

var _ = require("lodash");

var errors = {
  // JSHint options
  E001: "Bad option: '{a}'.",
  E002: "Bad option value.",

  // JSHint input
  E003: "Expected a JSON value.",
  E004: "Input is neither a string nor an array of strings.",
  E005: "Input is empty.",
  E006: "Unexpected early end of program.",

  // Strict mode
  E007: "Missing \"use strict\" statement.",
  E008: "Strict violation.",
  E009: "Option 'validthis' can't be used in a global scope.",
  E010: "'with' is not allowed in strict mode.",

  // Constants
  E011: "'{a}' has already been declared.",
  E012: "const '{a}' is initialized to 'undefined'.",
  E013: "Attempting to override '{a}' which is a constant.",

  // Regular expressions
  E014: "A regular expression literal can be confused with '/='.",
  E015: "Unclosed regular expression.",
  E016: "Invalid regular expression.",

  // Tokens
  E017: "Unclosed comment.",
  E018: "Unbegun comment.",
  E019: "Unmatched '{a}'.",
  E020: "Expected '{a}' to match '{b}' from line {c} and instead saw '{d}'.",
  E021: "Expected '{a}' and instead saw '{b}'.",
  E022: "Line breaking error '{a}'.",
  E023: "Missing '{a}'.",
  E024: "Unexpected '{a}'.",
  E025: "Missing ':' on a case clause.",
  E026: "Missing '}' to match '{' from line {a}.",
  E027: "Missing ']' to match '[' from line {a}.",
  E028: "Illegal comma.",
  E029: "Unclosed string.",

  // Everything else
  E030: "Expected an identifier and instead saw '{a}'.",
  E031: "Bad assignment.", // FIXME: Rephrase
  E032: "Expected a small integer or 'false' and instead saw '{a}'.",
  E033: "Expected an operator and instead saw '{a}'.",
  E034: "get/set are ES5 features.",
  E035: "Missing property name.",
  E036: "Expected to see a statement and instead saw a block.",
  E037: null,
  E038: null,
  E039: "Function declarations are not invocable. Wrap the whole function invocation in parens.",
  E040: "Each value should have its own case label.",
  E041: "Unrecoverable syntax error.",
  E042: "Stopping.",
  E043: "Too many errors.",
  E044: null,
  E045: "Invalid for each loop.",
  E046: "A yield statement shall be within a generator function (with syntax: `function*`)",
  E047: null,
  E048: "{a} declaration not directly within block.",
  E049: "A {a} cannot be named '{b}'.",
  E050: "Mozilla requires the yield expression to be parenthesized here.",
  E051: null,
  E052: "Unclosed template literal.",
  E053: "Export declaration must be in global scope.",
  E054: "Class properties must be methods. Expected '(' but instead saw '{a}'.",
  E055: "The '{a}' option cannot be set after any executable code.",
  E056: "'{a}' was used before it was declared, which is illegal for '{b}' variables.",
  E057: "Invalid meta property: '{a}.{b}'.",
  E058: "Missing semicolon.",
  E059: "Incompatible values for the '{a}' and '{b}' linting options."
};

var warnings = {
  W001: "'hasOwnProperty' is a really bad name.",
  W002: "Value of '{a}' may be overwritten in IE 8 and earlier.",
  W003: "'{a}' was used before it was defined.",
  W004: "'{a}' is already defined.",
  W005: "A dot following a number can be confused with a decimal point.",
  W006: "Confusing minuses.",
  W007: "Confusing plusses.",
  W008: "A leading decimal point can be confused with a dot: '{a}'.",
  W009: "The array literal notation [] is preferable.",
  W010: "The object literal notation {} is preferable.",
  W011: null,
  W012: null,
  W013: null,
  W014: "Bad line breaking before '{a}'.",
  W015: null,
  W016: "Unexpected use of '{a}'.",
  W017: "Bad operand.",
  W018: "Confusing use of '{a}'.",
  W019: "Use the isNaN function to compare with NaN.",
  W020: "Read only.",
  W021: "Reassignment of '{a}', which is is a {b}. " +
    "Use 'var' or 'let' to declare bindings that may change.",
  W022: "Do not assign to the exception parameter.",
  W023: "Expected an identifier in an assignment and instead saw a function invocation.",
  W024: "Expected an identifier and instead saw '{a}' (a reserved word).",
  W025: "Missing name in function declaration.",
  W026: "Inner functions should be listed at the top of the outer function.",
  W027: "Unreachable '{a}' after '{b}'.",
  W028: "Label '{a}' on {b} statement.",
  W030: "Expected an assignment or function call and instead saw an expression.",
  W031: "Do not use 'new' for side effects.",
  W032: "Unnecessary semicolon.",
  W033: "Missing semicolon.",
  W034: "Unnecessary directive \"{a}\".",
  W035: "Empty block.",
  W036: "Unexpected /*member '{a}'.",
  W037: "'{a}' is a statement label.",
  W038: "'{a}' used out of scope.",
  W039: "'{a}' is not allowed.",
  W040: "Possible strict violation.",
  W041: "Use '{a}' to compare with '{b}'.",
  W042: "Avoid EOL escaping.",
  W043: "Bad escaping of EOL. Use option multistr if needed.",
  W044: "Bad or unnecessary escaping.", /* TODO(caitp): remove W044 */
  W045: "Bad number '{a}'.",
  W046: "Don't use extra leading zeros '{a}'.",
  W047: "A trailing decimal point can be confused with a dot: '{a}'.",
  W048: "Unexpected control character in regular expression.",
  W049: "Unexpected escaped character '{a}' in regular expression.",
  W050: "JavaScript URL.",
  W051: "Variables should not be deleted.",
  W052: "Unexpected '{a}'.",
  W053: "Do not use {a} as a constructor.",
  W054: "The Function constructor is a form of eval.",
  W055: "A constructor name should start with an uppercase letter.",
  W056: "Bad constructor.",
  W057: "Weird construction. Is 'new' necessary?",
  W058: "Missing '()' invoking a constructor.",
  W059: "Avoid arguments.{a}.",
  W060: "document.write can be a form of eval.",
  W061: "eval can be harmful.",
  W062: "Wrap an immediate function invocation in parens " +
    "to assist the reader in understanding that the expression " +
    "is the result of a function, and not the function itself.",
  W063: "Math is not a function.",
  W064: "Missing 'new' prefix when invoking a constructor.",
  W065: "Missing radix parameter.",
  W066: "Implied eval. Consider passing a function instead of a string.",
  W067: "Bad invocation.",
  W068: "Wrapping non-IIFE function literals in parens is unnecessary.",
  W069: "['{a}'] is better written in dot notation.",
  W070: "Extra comma. (it breaks older versions of IE)",
  W071: "This function has too many statements. ({a})",
  W072: "This function has too many parameters. ({a})",
  W073: "Blocks are nested too deeply. ({a})",
  W074: "This function's cyclomatic complexity is too high. ({a})",
  W075: "Duplicate {a} '{b}'.",
  W076: "Unexpected parameter '{a}' in get {b} function.",
  W077: "Expected a single parameter in set {a} function.",
  W078: "Setter is defined without getter.",
  W079: "Redefinition of '{a}'.",
  W080: "It's not necessary to initialize '{a}' to 'undefined'.",
  W081: null,
  W082: "Function declarations should not be placed in blocks. " +
    "Use a function expression or move the statement to the top of " +
    "the outer function.",
  W083: "Don't make functions within a loop.",
  W084: "Expected a conditional expression and instead saw an assignment.",
  W085: "Don't use 'with'.",
  W086: "Expected a 'break' statement before '{a}'.",
  W087: "Forgotten 'debugger' statement?",
  W088: "Creating global 'for' variable. Should be 'for (var {a} ...'.",
  W089: "The body of a for in should be wrapped in an if statement to filter " +
    "unwanted properties from the prototype.",
  W090: "'{a}' is not a statement label.",
  W091: null,
  W093: "Did you mean to return a conditional instead of an assignment?",
  W094: "Unexpected comma.",
  W095: "Expected a string and instead saw {a}.",
  W096: "The '{a}' key may produce unexpected results.",
  W097: "Use the function form of \"use strict\".",
  W098: "'{a}' is defined but never used.",
  W099: null,
  W100: "This character may get silently deleted by one or more browsers.",
  W101: "Line is too long.",
  W102: null,
  W103: "The '{a}' property is deprecated.",
  W104: "'{a}' is available in ES{b} (use 'esversion: {b}') or Mozilla JS extensions (use moz).",
  W105: "Unexpected {a} in '{b}'.",
  W106: "Identifier '{a}' is not in camel case.",
  W107: "Script URL.",
  W108: "Strings must use doublequote.",
  W109: "Strings must use singlequote.",
  W110: "Mixed double and single quotes.",
  W112: "Unclosed string.",
  W113: "Control character in string: {a}.",
  W114: "Avoid {a}.",
  W115: "Octal literals are not allowed in strict mode.",
  W116: "Expected '{a}' and instead saw '{b}'.",
  W117: "'{a}' is not defined.",
  W118: "'{a}' is only available in Mozilla JavaScript extensions (use moz option).",
  W119: "'{a}' is only available in ES{b} (use 'esversion: {b}').",
  W120: "You might be leaking a variable ({a}) here.",
  W121: "Extending prototype of native object: '{a}'.",
  W122: "Invalid typeof value '{a}'",
  W123: "'{a}' is already defined in outer scope.",
  W124: "A generator function shall contain a yield statement.",
  W125: "This line contains non-breaking spaces: http://jshint.com/docs/options/#nonbsp",
  W126: "Unnecessary grouping operator.",
  W127: "Unexpected use of a comma operator.",
  W128: "Empty array elements require elision=true.",
  W129: "'{a}' is defined in a future version of JavaScript. Use a " +
    "different variable name to avoid migration issues.",
  W130: "Invalid element after rest element.",
  W131: "Invalid parameter after rest parameter.",
  W132: "`var` declarations are forbidden. Use `let` or `const` instead.",
  W133: "Invalid for-{a} loop left-hand-side: {b}.",
  W134: "The '{a}' option is only available when linting ECMAScript {b} code.",
  W135: "{a} may not be supported by non-browser environments.",
  W136: "'{a}' must be in function scope.",
  W137: "Empty destructuring.",
  W138: "Regular parameters should not come after default parameters."
};

var info = {
  I001: "Comma warnings can be turned off with 'laxcomma'.",
  I002: null,
  I003: "ES5 option is now set per default"
};

exports.errors = {};
exports.warnings = {};
exports.info = {};

_.each(errors, function(desc, code) {
  exports.errors[code] = { code: code, desc: desc };
});

_.each(warnings, function(desc, code) {
  exports.warnings[code] = { code: code, desc: desc };
});

_.each(info, function(desc, code) {
  exports.info[code] = { code: code, desc: desc };
});

},{"lodash":12}],15:[function(require,module,exports){
"use strict";

function NameStack() {
  this._stack = [];
}

Object.defineProperty(NameStack.prototype, "length", {
  get: function() {
    return this._stack.length;
  }
});

/**
 * Create a new entry in the stack. Useful for tracking names across
 * expressions.
 */
NameStack.prototype.push = function() {
  this._stack.push(null);
};

/**
 * Discard the most recently-created name on the stack.
 */
NameStack.prototype.pop = function() {
  this._stack.pop();
};

/**
 * Update the most recent name on the top of the stack.
 *
 * @param {object} token The token to consider as the source for the most
 *                       recent name.
 */
NameStack.prototype.set = function(token) {
  this._stack[this.length - 1] = token;
};

/**
 * Generate a string representation of the most recent name.
 *
 * @returns {string}
 */
NameStack.prototype.infer = function() {
  var nameToken = this._stack[this.length - 1];
  var prefix = "";
  var type;

  // During expected operation, the topmost entry on the stack will only
  // reflect the current function's name when the function is declared without
  // the `function` keyword (i.e. for in-line accessor methods). In other
  // cases, the `function` expression itself will introduce an empty entry on
  // the top of the stack, and this should be ignored.
  if (!nameToken || nameToken.type === "class") {
    nameToken = this._stack[this.length - 2];
  }

  if (!nameToken) {
    return "(empty)";
  }

  type = nameToken.type;

  if (type !== "(string)" && type !== "(number)" && type !== "(identifier)" && type !== "default") {
    return "(expression)";
  }

  if (nameToken.accessorType) {
    prefix = nameToken.accessorType + " ";
  }

  return prefix + nameToken.value;
};

module.exports = NameStack;

},{}],16:[function(require,module,exports){
"use strict";

// These are the JSHint boolean options.
exports.bool = {
  enforcing: {

    /**
     * This option prohibits the use of bitwise operators such as `^` (XOR),
     * `|` (OR) and others. Bitwise operators are very rare in JavaScript
     * programs and quite often `&` is simply a mistyped `&&`.
     */
    bitwise     : true,

    /**
     *
     * This options prohibits overwriting prototypes of native objects such as
     * `Array`, `Date` and so on.
     *
     *     // jshint freeze:true
     *     Array.prototype.count = function (value) { return 4; };
     *     // -> Warning: Extending prototype of native object: 'Array'.
     */
    freeze      : true,

    /**
     * This option allows you to force all variable names to use either
     * camelCase style or UPPER_CASE with underscores.
     *
     * @deprecated JSHint is limiting its scope to issues of code correctness.
     *             If you would like to enforce rules relating to code style,
     *             check out [the JSCS
     *             project](https://github.com/jscs-dev/node-jscs).
     */
    camelcase   : true,

    /**
     * This option requires you to always put curly braces around blocks in
     * loops and conditionals. JavaScript allows you to omit curly braces when
     * the block consists of only one statement, for example:
     *
     *     while (day)
     *       shuffle();
     *
     * However, in some circumstances, it can lead to bugs (you'd think that
     * `sleep()` is a part of the loop while in reality it is not):
     *
     *     while (day)
     *       shuffle();
     *       sleep();
     */
    curly       : true,

    /**
     * This options prohibits the use of `==` and `!=` in favor of `===` and
     * `!==`. The former try to coerce values before comparing them which can
     * lead to some unexpected results. The latter don't do any coercion so
     * they are generally safer. If you would like to learn more about type
     * coercion in JavaScript, we recommend [Truth, Equality and
     * JavaScript](http://javascriptweblog.wordpress.com/2011/02/07/truth-equality-and-javascript/)
     * by Angus Croll.
     */
    eqeqeq      : true,

    /**
     * This option enables warnings about the use of identifiers which are
     * defined in future versions of JavaScript. Although overwriting them has
     * no effect in contexts where they are not implemented, this practice can
     * cause issues when migrating codebases to newer versions of the language.
     */
    futurehostile: true,

    /**
     * This option suppresses warnings about invalid `typeof` operator values.
     * This operator has only [a limited set of possible return
     * values](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof).
     * By default, JSHint warns when you compare its result with an invalid
     * value which often can be a typo.
     *
     *     // 'fuction' instead of 'function'
     *     if (typeof a == "fuction") { // Invalid typeof value 'fuction'
     *       // ...
     *     }
     *
     * Do not use this option unless you're absolutely sure you don't want
     * these checks.
     */
    notypeof    : true,

    /**
     * This option tells JSHint that your code needs to adhere to ECMAScript 3
     * specification. Use this option if you need your program to be executable
     * in older browsers—such as Internet Explorer 6/7/8/9—and other legacy
     * JavaScript environments.
     *
     * @deprecated Use `esversion: 3` instead.
     */
    es3         : true,

    /**
     * This option enables syntax first defined in [the ECMAScript 5.1
     * specification](http://es5.github.io/). This includes allowing reserved
     * keywords as object properties.
     *
     * @deprecated Use `esversion: 5` instead.
     */
    es5         : true,

    /**
     * This option requires all `for in` loops to filter object's items. The
     * for in statement allows for looping through the names of all of the
     * properties of an object including those inherited through the prototype
     * chain. This behavior can lead to unexpected items in your object so it
     * is generally safer to always filter inherited properties out as shown in
     * the example:
     *
     *     for (key in obj) {
     *       if (obj.hasOwnProperty(key)) {
     *         // We are sure that obj[key] belongs to the object and was not inherited.
     *       }
     *     }
     *
     * For more in-depth understanding of `for in` loops in JavaScript, read
     * [Exploring JavaScript for-in
     * loops](http://javascriptweblog.wordpress.com/2011/01/04/exploring-javascript-for-in-loops/)
     * by Angus Croll.
     */
    forin       : true,

    /**
     * This option suppresses warnings about declaring variables inside of
     * control
     * structures while accessing them later from the outside. Even though
     * JavaScript has only two real scopes—global and function—such practice
     * leads to confusion among people new to the language and hard-to-debug
     * bugs. This is why, by default, JSHint warns about variables that are
     * used outside of their intended scope.
     *
     *     function test() {
     *       if (true) {
     *         var x = 0;
     *       }
     *
     *       x += 1; // Default: 'x' used out of scope.
     *                 // No warning when funcscope:true
     *     }
     */
    funcscope   : true,

    /**
     * This option prohibits the use of immediate function invocations without
     * wrapping them in parentheses. Wrapping parentheses assists readers of
     * your code in understanding that the expression is the result of a
     * function, and not the function itself.
     *
     * @deprecated JSHint is limiting its scope to issues of code correctness.
     *             If you would like to enforce rules relating to code style,
     *             check out [the JSCS
     *             project](https://github.com/jscs-dev/node-jscs).
     */
    immed       : true,

    /**
     * This option suppresses warnings about the `__iterator__` property. This
     * property is not supported by all browsers so use it carefully.
     */
    iterator    : true,

    /**
     * This option requires you to capitalize names of constructor functions.
     * Capitalizing functions that are intended to be used with `new` operator
     * is just a convention that helps programmers to visually distinguish
     * constructor functions from other types of functions to help spot
     * mistakes when using `this`.
     *
     * Not doing so won't break your code in any browsers or environments but
     * it will be a bit harder to figure out—by reading the code—if the
     * function was supposed to be used with or without new. And this is
     * important because when the function that was intended to be used with
     * `new` is used without it, `this` will point to the global object instead
     * of a new object.
     *
     * @deprecated JSHint is limiting its scope to issues of code correctness.
     *             If you would like to enforce rules relating to code style,
     *             check out [the JSCS
     *             project](https://github.com/jscs-dev/node-jscs).
     */
    newcap      : true,

    /**
     * This option prohibits the use of `arguments.caller` and
     * `arguments.callee`.  Both `.caller` and `.callee` make quite a few
     * optimizations impossible so they were deprecated in future versions of
     * JavaScript. In fact, ECMAScript 5 forbids the use of `arguments.callee`
     * in strict mode.
     */
    noarg       : true,

    /**
     * This option prohibits the use of the comma operator. When misused, the
     * comma operator can obscure the value of a statement and promote
     * incorrect code.
     */
    nocomma     : true,

    /**
     * This option warns when you have an empty block in your code. JSLint was
     * originally warning for all empty blocks and we simply made it optional.
     * There were no studies reporting that empty blocks in JavaScript break
     * your code in any way.
     *
     * @deprecated JSHint is limiting its scope to issues of code correctness.
     *             If you would like to enforce rules relating to code style,
     *             check out [the JSCS
     *             project](https://github.com/jscs-dev/node-jscs).
     */
    noempty     : true,

    /**
     * This option warns about "non-breaking whitespace" characters. These
     * characters can be entered with option-space on Mac computers and have a
     * potential of breaking non-UTF8 web pages.
     */
    nonbsp      : true,

    /**
     * This option prohibits the use of constructor functions for side-effects.
     * Some people like to call constructor functions without assigning its
     * result to any variable:
     *
     *     new MyConstructor();
     *
     * There is no advantage in this approach over simply calling
     * `MyConstructor` since the object that the operator `new` creates isn't
     * used anywhere so you should generally avoid constructors like this one.
     */
    nonew       : true,

    /**
     * This option prohibits the use of explicitly undeclared variables. This
     * option is very useful for spotting leaking and mistyped variables.
     *
     *     // jshint undef:true
     *
     *     function test() {
     *       var myVar = 'Hello, World';
     *       console.log(myvar); // Oops, typoed here. JSHint with undef will complain
     *     }
     *
     * If your variable is defined in another file, you can use the `global`
     * directive to tell JSHint about it.
     */
    undef       : true,

    /**
     * This option prohibits the use of the grouping operator when it is not
     * strictly required. Such usage commonly reflects a misunderstanding of
     * unary operators, for example:
     *
     *     // jshint singleGroups: true
     *
     *     delete(obj.attr); // Warning: Unnecessary grouping operator.
     */
    singleGroups: false,

    /**
     * When set to true, the use of VariableStatements are forbidden.
     * For example:
     *
     *     // jshint varstmt: true
     *
     *     var a; // Warning: `var` declarations are forbidden. Use `let` or `const` instead.
     */
    varstmt: false,

    /**
     * This option is a short hand for the most strict JSHint configuration as
     * available in JSHint version 2.6.3. It enables all enforcing options and
     * disables all relaxing options that were defined in that release.
     *
     * @deprecated The option cannot be maintained without automatically opting
     *             users in to new features. This can lead to unexpected
     *             warnings/errors in when upgrading between minor versions of
     *             JSHint.
     */
    enforceall : false
  },
  relaxing: {

    /**
     * This option suppresses warnings about missing semicolons. There is a lot
     * of FUD about semicolon spread by quite a few people in the community.
     * The common myths are that semicolons are required all the time (they are
     * not) and that they are unreliable. JavaScript has rules about semicolons
     * which are followed by *all* browsers so it is up to you to decide
     * whether you should or should not use semicolons in your code.
     *
     * For more information about semicolons in JavaScript read [An Open Letter
     * to JavaScript Leaders Regarding
     * Semicolons](http://blog.izs.me/post/2353458699/an-open-letter-to-javascript-leaders-regarding)
     * by Isaac Schlueter and [JavaScript Semicolon
     * Insertion](http://inimino.org/~inimino/blog/javascript_semicolons).
     */
    asi         : true,

    /**
     * This option suppresses warnings about multi-line strings. Multi-line
     * strings can be dangerous in JavaScript because all hell breaks loose if
     * you accidentally put a whitespace in between the escape character (`\`)
     * and a new line.
     *
     * Note that even though this option allows correct multi-line strings, it
     * still warns about multi-line strings without escape characters or with
     * anything in between the escape character and a whitespace.
     *
     *     // jshint multistr:true
     *
     *     var text = "Hello\
     *     World"; // All good.
     *
     *     text = "Hello
     *     World"; // Warning, no escape character.
     *
     *     text = "Hello\
     *     World"; // Warning, there is a space after \
     *
     * @deprecated JSHint is limiting its scope to issues of code correctness.
     *             If you would like to enforce rules relating to code style,
     *             check out [the JSCS
     *             project](https://github.com/jscs-dev/node-jscs).
     */
    multistr    : true,

    /**
     * This option suppresses warnings about the `debugger` statements in your
     * code.
     */
    debug       : true,

    /**
     * This option suppresses warnings about the use of assignments in cases
     * where comparisons are expected. More often than not, code like `if (a =
     * 10) {}` is a typo. However, it can be useful in cases like this one:
     *
     *     for (var i = 0, person; person = people[i]; i++) {}
     *
     * You can silence this error on a per-use basis by surrounding the assignment
     * with parenthesis, such as:
     *
     *     for (var i = 0, person; (person = people[i]); i++) {}
     */
    boss        : true,

    /**
     * This option suppresses warnings about the use of `eval`. The use of
     * `eval` is discouraged because it can make your code vulnerable to
     * various injection attacks and it makes it hard for JavaScript
     * interpreter to do certain optimizations.
    */
    evil        : true,

    /**
     * This option suppresses warnings about the use of global strict mode.
     * Global strict mode can break third-party widgets so it is not
     * recommended.
     *
     * For more info about strict mode see the `strict` option.
     *
     * @deprecated Use `strict: "global"`.
     */
    globalstrict: true,

    /**
     * This option prohibits the use of unary increment and decrement
     * operators.  Some people think that `++` and `--` reduces the quality of
     * their coding styles and there are programming languages—such as
     * Python—that go completely without these operators.
     */
    plusplus    : true,

    /**
     * This option suppresses warnings about the `__proto__` property.
     */
    proto       : true,

    /**
     * This option suppresses warnings about the use of script-targeted
     * URLs—such as `javascript:...`.
     */
    scripturl   : true,

    /**
     * This option suppresses warnings about using `[]` notation when it can be
     * expressed in dot notation: `person['name']` vs. `person.name`.
     *
     * @deprecated JSHint is limiting its scope to issues of code correctness.
     *             If you would like to enforce rules relating to code style,
     *             check out [the JSCS
     *             project](https://github.com/jscs-dev/node-jscs).
     */
    sub         : true,

    /**
     * This option suppresses warnings about "weird" constructions like
     * `new function () { ... }` and `new Object;`. Such constructions are
     * sometimes used to produce singletons in JavaScript:
     *
     *     var singleton = new function() {
     *       var privateVar;
     *
     *       this.publicMethod  = function () {}
     *       this.publicMethod2 = function () {}
     *     };
     */
    supernew    : true,

    /**
     * This option suppresses most of the warnings about possibly unsafe line
     * breakings in your code. It doesn't suppress warnings about comma-first
     * coding style. To suppress those you have to use `laxcomma` (see below).
     *
     * @deprecated JSHint is limiting its scope to issues of code correctness.
     *             If you would like to enforce rules relating to code style,
     *             check out [the JSCS
     *             project](https://github.com/jscs-dev/node-jscs).
     */
    laxbreak    : true,

    /**
     * This option suppresses warnings about comma-first coding style:
     *
     *     var obj = {
     *         name: 'Anton'
     *       , handle: 'valueof'
     *       , role: 'SW Engineer'
     *     };
     *
     * @deprecated JSHint is limiting its scope to issues of code correctness.
     *             If you would like to enforce rules relating to code style,
     *             check out [the JSCS
     *             project](https://github.com/jscs-dev/node-jscs).
     */
    laxcomma    : true,

    /**
     * This option suppresses warnings about possible strict violations when
     * the code is running in strict mode and you use `this` in a
     * non-constructor function. You should use this option—in a function scope
     * only—when you are positive that your use of `this` is valid in the
     * strict mode (for example, if you call your function using
     * `Function.call`).
     *
     * **Note:** This option can be used only inside of a function scope.
     * JSHint will fail with an error if you will try to set this option
     * globally.
     */
    validthis   : true,

    /**
     * This option suppresses warnings about the use of the `with` statement.
     * The semantics of the `with` statement can cause confusion among
     * developers and accidental definition of global variables.
     *
     * More info:
     *
     * * [with Statement Considered
     *   Harmful](http://yuiblog.com/blog/2006/04/11/with-statement-considered-harmful/)
     */
    withstmt    : true,

    /**
     * This options tells JSHint that your code uses Mozilla JavaScript
     * extensions. Unless you develop specifically for the Firefox web browser
     * you don't need this option.
     *
     * More info:
     *
     * * [New in JavaScript
     *   1.7](https://developer.mozilla.org/en-US/docs/JavaScript/New_in_JavaScript/1.7)
     */
    moz         : true,

    /**
     * This option suppresses warnings about generator functions with no
     * `yield` statement in them.
     */
    noyield     : true,

    /**
     * This option suppresses warnings about `== null` comparisons. Such
     * comparisons are often useful when you want to check if a variable is
     * `null` or `undefined`.
     */
    eqnull      : true,

    /**
     * This option suppresses warnings about missing semicolons, but only when
     * the semicolon is omitted for the last statement in a one-line block:
     *
     *     var name = (function() { return 'Anton' }());
     *
     * This is a very niche use case that is useful only when you use automatic
     * JavaScript code generators.
     */
    lastsemic   : true,

    /**
     * This option suppresses warnings about functions inside of loops.
     * Defining functions inside of loops can lead to bugs such as this one:
     *
     *     var nums = [];
     *
     *     for (var i = 0; i < 10; i++) {
     *       nums[i] = function (j) {
     *         return i + j;
     *       };
     *     }
     *
     *     nums[0](2); // Prints 12 instead of 2
     *
     * To fix the code above you need to copy the value of `i`:
     *
     *     var nums = [];
     *
     *     for (var i = 0; i < 10; i++) {
     *       (function (i) {
     *         nums[i] = function (j) {
     *             return i + j;
     *         };
     *       }(i));
     *     }
     */
    loopfunc    : true,

    /**
     * This option suppresses warnings about the use of expressions where
     * normally you would expect to see assignments or function calls. Most of
     * the time, such code is a typo. However, it is not forbidden by the spec
     * and that's why this warning is optional.
     */
    expr        : true,

    /**
     * This option tells JSHint that your code uses ECMAScript 6 specific
     * syntax. Note that not all browsers implement these features.
     *
     * More info:
     *
     * * [Specification for ECMAScript
     *   6](http://www.ecma-international.org/ecma-262/6.0/index.html)
     *
     * @deprecated Use `esversion: 6` instead.
     */
    esnext      : true,

    /**
     * This option tells JSHint that your code uses ES3 array elision elements,
     * or empty elements (for example, `[1, , , 4, , , 7]`).
     */
    elision     : true,
  },

  // Third party globals
  environments: {

    /**
     * This option defines globals exposed by the
     * [MooTools](http://mootools.net/) JavaScript framework.
     */
    mootools    : true,

    /**
     * This option defines globals exposed by
     * [CouchDB](http://couchdb.apache.org/). CouchDB is a document-oriented
     * database that can be queried and indexed in a MapReduce fashion using
     * JavaScript.
     */
    couch       : true,

    /**
     * This option defines globals exposed by [the Jasmine unit testing
     * framework](https://jasmine.github.io/).
     */
    jasmine     : true,

    /**
     * This option defines globals exposed by the [jQuery](http://jquery.com/)
     * JavaScript library.
     */
    jquery      : true,

    /**
     * This option defines globals available when your code is running inside
     * of the Node runtime environment. [Node.js](http://nodejs.org/) is a
     * server-side JavaScript environment that uses an asynchronous
     * event-driven model. This option also skips some warnings that make sense
     * in the browser environments but don't make sense in Node such as
     * file-level `use strict` pragmas and `console.log` statements.
     */
    node        : true,

    /**
     * This option defines globals exposed by [the QUnit unit testing
     * framework](http://qunitjs.com/).
     */
    qunit       : true,

    /**
     * This option defines globals available when your code is running inside
     * of the Rhino runtime environment. [Rhino](http://www.mozilla.org/rhino/)
     * is an open-source implementation of JavaScript written entirely in Java.
     */
    rhino       : true,

    /**
     * This option defines globals exposed by [the ShellJS
     * library](http://documentup.com/arturadib/shelljs).
     */
    shelljs     : true,

    /**
     * This option defines globals exposed by the
     * [Prototype](http://www.prototypejs.org/) JavaScript framework.
     */
    prototypejs : true,

    /**
     * This option defines globals exposed by the [YUI](http://yuilibrary.com/)
     * JavaScript framework.
     */
    yui         : true,

    /**
     * This option defines globals exposed by the "BDD" and "TDD" UIs of the
     * [Mocha unit testing framework](http://mochajs.org/).
     */
    mocha       : true,

    /**
     * This option informs JSHint that the input code describes an ECMAScript 6
     * module. All module code is interpreted as strict mode code.
     */
    module      : true,

    /**
     * This option defines globals available when your code is running as a
     * script for the [Windows Script
     * Host](http://en.wikipedia.org/wiki/Windows_Script_Host).
     */
    wsh         : true,

    /**
     * This option defines globals available when your code is running inside
     * of a Web Worker. [Web
     * Workers](https://developer.mozilla.org/en/Using_web_workers) provide a
     * simple means for web content to run scripts in background threads.
     */
    worker      : true,

    /**
     * This option defines non-standard but widely adopted globals such as
     * `escape` and `unescape`.
     */
    nonstandard : true,

    /**
     * This option defines globals exposed by modern browsers: all the way from
     * good old `document` and `navigator` to the HTML5 `FileReader` and other
     * new developments in the browser world.
     *
     * **Note:** This option doesn't expose variables like `alert` or
     * `console`. See option `devel` for more information.
     */
    browser     : true,

    /**
     * This option defines globals available when using [the Browserify
     * tool](http://browserify.org/) to build a project.
     */
    browserify  : true,

    /**
     * This option defines globals that are usually used for logging poor-man's
     * debugging: `console`, `alert`, etc. It is usually a good idea to not
     * ship them in production because, for example, `console.log` breaks in
     * legacy versions of Internet Explorer.
     */
    devel       : true,

    /**
     * This option defines globals exposed by the [Dojo
     * Toolkit](http://dojotoolkit.org/).
     */
    dojo        : true,

    /**
     * This option defines globals for typed array constructors.
     *
     * More info:
     *
     * * [JavaScript typed
     *   arrays](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Typed_arrays)
     */
    typed       : true,

    /**
     * This option defines globals available when your core is running inside
     * of the PhantomJS runtime environment. [PhantomJS](http://phantomjs.org/)
     * is a headless WebKit scriptable with a JavaScript API. It has fast and
     * native support for various web standards: DOM handling, CSS selector,
     * JSON, Canvas, and SVG.
     */
    phantom     : true
  },

  // Obsolete options
  obsolete: {
    onecase     : true, // if one case switch statements should be allowed
    regexp      : true, // if the . should not be allowed in regexp literals
    regexdash   : true  // if unescaped first/last dash (-) inside brackets
                        // should be tolerated
  }
};

// These are the JSHint options that can take any value
// (we use this object to detect invalid options)
exports.val = {

  /**
   * This option lets you set the maximum length of a line.
   *
   * @deprecated JSHint is limiting its scope to issues of code correctness. If
   *             you would like to enforce rules relating to code style, check
   *             out [the JSCS project](https://github.com/jscs-dev/node-jscs).
   */
  maxlen       : false,

  /**
   * This option sets a specific tab width for your code.
   *
   * @deprecated JSHint is limiting its scope to issues of code correctness. If
   *             you would like to enforce rules relating to code style, check
   *             out [the JSCS project](https://github.com/jscs-dev/node-jscs).
   */
  indent       : false,

  /**
   * This options allows you to set the maximum amount of warnings JSHint will
   * produce before giving up. Default is 50.
   */
  maxerr       : false,

  /**
   * This option allows you to control which variables JSHint considers to be
   * implicitly defined in the environment. Configure it with an array of
   * string values. Prefixing a variable name with a hyphen (-) character will
   * remove that name from the collection of predefined variables.
   *
   * JSHint will consider variables declared in this way to be read-only.
   *
   * This option cannot be specified in-line; it may only be used via the
   * JavaScript API or from an external configuration file.
   */
  predef       : false,

  /**
   * This option can be used to specify a white list of global variables that
   * are not formally defined in the source code. This is most useful when
   * combined with the `undef` option in order to suppress warnings for
   * project-specific global variables.
   *
   * Setting an entry to `true` enables reading and writing to that variable.
   * Setting it to `false` will trigger JSHint to consider that variable
   * read-only.
   *
   * See also the "environment" options: a set of options to be used as short
   * hand for enabling global variables defined in common JavaScript
   * environments.
   *
   * To configure `globals` within an individual file, see [Inline
   * Configuration](http://jshint.com/docs/#inline-configuration).
   */
  globals      : false,

  /**
   * This option enforces the consistency of quotation marks used throughout
   * your code. It accepts three values: `true` if you don't want to enforce
   * one particular style but want some consistency, `"single"` if you want to
   * allow only single quotes and `"double"` if you want to allow only double
   * quotes.
   *
   * @deprecated JSHint is limiting its scope to issues of code correctness. If
   *             you would like to enforce rules relating to code style, check
   *             out [the JSCS project](https://github.com/jscs-dev/node-jscs).
   */
  quotmark     : false,

  scope        : false,

  /**
   * This option lets you set the max number of statements allowed per function:
   *
   *     // jshint maxstatements:4
   *
   *     function main() {
   *       var i = 0;
   *       var j = 0;
   *
   *       // Function declarations count as one statement. Their bodies
   *       // don't get taken into account for the outer function.
   *       function inner() {
   *         var i2 = 1;
   *         var j2 = 1;
   *
   *         return i2 + j2;
   *       }
   *
   *       j = i + j;
   *       return j; // JSHint: Too many statements per function. (5)
   *     }
   */
  maxstatements: false,

  /**
   * This option lets you control how nested do you want your blocks to be:
   *
   *     // jshint maxdepth:2
   *
   *     function main(meaning) {
   *       var day = true;
   *
   *       if (meaning === 42) {
   *         while (day) {
   *           shuffle();
   *
   *           if (tired) { // JSHint: Blocks are nested too deeply (3).
   *               sleep();
   *           }
   *         }
   *       }
   *     }
   */
  maxdepth     : false,

  /**
   * This option lets you set the max number of formal parameters allowed per
   * function:
   *
   *     // jshint maxparams:3
   *
   *     function login(request, onSuccess) {
   *       // ...
   *     }
   *
   *     // JSHint: Too many parameters per function (4).
   *     function logout(request, isManual, whereAmI, onSuccess) {
   *       // ...
   *     }
   */
  maxparams    : false,

  /**
   * This option lets you control cyclomatic complexity throughout your code.
   * Cyclomatic complexity measures the number of linearly independent paths
   * through a program's source code. Read more about [cyclomatic complexity on
   * Wikipedia](http://en.wikipedia.org/wiki/Cyclomatic_complexity).
   */
  maxcomplexity: false,

  /**
   * This option suppresses warnings about variable shadowing i.e. declaring a
   * variable that had been already declared somewhere in the outer scope.
   *
   * - "inner"  - check for variables defined in the same scope only
   * - "outer"  - check for variables defined in outer scopes as well
   * - false    - same as inner
   * - true     - allow variable shadowing
   */
  shadow       : false,

  /**
   * This option requires the code to run in ECMAScript 5's strict mode.
   * [Strict mode](https://developer.mozilla.org/en/JavaScript/Strict_mode)
   * is a way to opt in to a restricted variant of JavaScript. Strict mode
   * eliminates some JavaScript pitfalls that didn't cause errors by changing
   * them to produce errors.  It also fixes mistakes that made it difficult
   * for the JavaScript engines to perform certain optimizations.
   *
   * - "global"  - there must be a `"use strict";` directive at global level
   * - "implied" - lint the code as if there is the `"use strict";` directive
   * - false     - disable warnings about strict mode
   * - true      - there must be a `"use strict";` directive at function level;
   *               this is preferable for scripts intended to be loaded in web
   *               browsers directly because enabling strict mode globally
   *               could adversely effect other scripts running on the same
   *               page
   */
  strict      : true,

  /**
   * This option warns when you define and never use your variables. It is very
   * useful for general code cleanup, especially when used in addition to
   * `undef`.
   *
   *     // jshint unused:true
   *
   *     function test(a, b) {
   *       var c, d = 2;
   *
   *       return a + d;
   *     }
   *
   *     test(1, 2);
   *
   *     // Line 3: 'b' was defined but never used.
   *     // Line 4: 'c' was defined but never used.
   *
   * In addition to that, this option will warn you about unused global
   * variables declared via the `global` directive.
   *
   * This can be set to `vars` to only check for variables, not function
   * parameters, or `strict` to check all variables and parameters.  The
   * default (true) behavior is to allow unused parameters that are followed by
   * a used parameter.
   */
  unused       : true,

  /**
   * This option prohibits the use of a variable before it was defined.
   * JavaScript has function scope only and, in addition to that, all variables
   * are always moved—or hoisted— to the top of the function. This behavior can
   * lead to some very nasty bugs and that's why it is safer to always use
   * variable only after they have been explicitly defined.
   *
   * Setting this option to "nofunc" will allow function declarations to be
   * ignored.
   *
   * For more in-depth understanding of scoping and hoisting in JavaScript,
   * read [JavaScript Scoping and
   * Hoisting](http://www.adequatelygood.com/2010/2/JavaScript-Scoping-and-Hoisting)
   * by Ben Cherry.
   */
  latedef      : false,

  ignore       : false, // start/end ignoring lines of code, bypassing the lexer
                        //   start    - start ignoring lines, including the current line
                        //   end      - stop ignoring lines, starting on the next line
                        //   line     - ignore warnings / errors for just a single line
                        //              (this option does not bypass the lexer)

  ignoreDelimiters: false, // array of start/end delimiters used to ignore
                           // certain chunks from code

  /**
   * This option is used to specify the ECMAScript version to which the code
   * must adhere. It can assume one of the following values:
   *  - `3` - If you need your program to be executable
   *    in older browsers—such as Internet Explorer 6/7/8/9—and other legacy
   *    JavaScript environments
   *  - `5` - To enable syntax first defined in [the ECMAScript 5.1
   *    specification](http://www.ecma-international.org/ecma-262/5.1/index.html).
   *    This includes allowing reserved keywords as object properties.
   *  - `6` - To tell JSHint that your code uses [ECMAScript
   *    6](http://www.ecma-international.org/ecma-262/6.0/index.html) specific
   *    syntax. Note that not all browsers implement them.
   */
  esversion: 5
};

// These are JSHint boolean options which are shared with JSLint
// where the definition in JSHint is opposite JSLint
exports.inverted = {
  bitwise : true,
  forin   : true,
  newcap  : true,
  plusplus: true,
  regexp  : true,
  undef   : true,

  // Inverted and renamed, use JSHint name here
  eqeqeq  : true,
  strict  : true
};

exports.validNames = Object.keys(exports.val)
  .concat(Object.keys(exports.bool.relaxing))
  .concat(Object.keys(exports.bool.enforcing))
  .concat(Object.keys(exports.bool.obsolete))
  .concat(Object.keys(exports.bool.environments));

// These are JSHint boolean options which are shared with JSLint
// where the name has been changed but the effect is unchanged
exports.renamed = {
  eqeq   : "eqeqeq",
  windows: "wsh",
  sloppy : "strict"
};

exports.removed = {
  nomen: true,
  onevar: true,
  passfail: true,
  white: true,
  gcl: true,
  smarttabs: true,
  trailing: true
};

// Add options here which should not be automatically enforced by
// `enforceall`.
exports.noenforceall = {
  varstmt: true,
  strict: true
};

},{}],17:[function(require,module,exports){
/*
 * Regular expressions. Some of these are stupidly long.
 */

/*jshint maxlen:1000 */

"use strict";

// Unsafe comment or string (ax)
exports.unsafeString =
  /@cc|<\/?|script|\]\s*\]|<\s*!|&lt/i;

// Unsafe characters that are silently deleted by one or more browsers (cx)
exports.unsafeChars =
  /[\u0000-\u001f\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/;

// Characters in strings that need escaping (nx and nxg)
exports.needEsc =
  /[\u0000-\u001f&<"\/\\\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/;

exports.needEscGlobal =
  /[\u0000-\u001f&<"\/\\\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;

// Star slash (lx)
exports.starSlash = /\*\//;

// Identifier (ix)
exports.identifier = /^([a-zA-Z_$][a-zA-Z0-9_$]*)$/;

// JavaScript URL (jx)
exports.javascriptURL = /^(?:javascript|jscript|ecmascript|vbscript|livescript)\s*:/i;

// Catches /* falls through */ comments (ft)
exports.fallsThrough = /^\s*falls?\sthrough\s*$/;

// very conservative rule (eg: only one space between the start of the comment and the first character)
// to relax the maxlen option
exports.maxlenException = /^(?:(?:\/\/|\/\*|\*) ?)?[^ ]+$/;

},{}],18:[function(require,module,exports){
"use strict";

var _      = require("lodash");
var events = require("events");

// Used to denote membership in lookup tables (a primitive value such as `true`
// would be silently rejected for the property name "__proto__" in some
// environments)
var marker = {};

/**
 * Creates a scope manager that handles variables and labels, storing usages
 * and resolving when variables are used and undefined
 */
var scopeManager = function(state, predefined, exported, declared) {

  var _current;
  var _scopeStack = [];

  function _newScope(type) {
    _current = {
      "(labels)": Object.create(null),
      "(usages)": Object.create(null),
      "(breakLabels)": Object.create(null),
      "(parent)": _current,
      "(type)": type,
      "(params)": (type === "functionparams" || type === "catchparams") ? [] : null
    };
    _scopeStack.push(_current);
  }

  _newScope("global");
  _current["(predefined)"] = predefined;

  var _currentFunctBody = _current; // this is the block after the params = function

  var usedPredefinedAndGlobals = Object.create(null);
  var impliedGlobals = Object.create(null);
  var unuseds = [];
  var emitter = new events.EventEmitter();

  function warning(code, token) {
    emitter.emit("warning", {
      code: code,
      token: token,
      data: _.slice(arguments, 2)
    });
  }

  function error(code, token) {
    emitter.emit("warning", {
      code: code,
      token: token,
      data: _.slice(arguments, 2)
    });
  }

  function _setupUsages(labelName) {
    if (!_current["(usages)"][labelName]) {
      _current["(usages)"][labelName] = {
        "(modified)": [],
        "(reassigned)": [],
        "(tokens)": []
      };
    }
  }

  var _getUnusedOption = function(unused_opt) {
    if (unused_opt === undefined) {
      unused_opt = state.option.unused;
    }

    if (unused_opt === true) {
      unused_opt = "last-param";
    }

    return unused_opt;
  };

  var _warnUnused = function(name, tkn, type, unused_opt) {
    var line = tkn.line;
    var chr  = tkn.from;
    var raw_name = tkn.raw_text || name;

    unused_opt = _getUnusedOption(unused_opt);

    var warnable_types = {
      "vars": ["var"],
      "last-param": ["var", "param"],
      "strict": ["var", "param", "last-param"]
    };

    if (unused_opt) {
      if (warnable_types[unused_opt] && warnable_types[unused_opt].indexOf(type) !== -1) {
        warning("W098", { line: line, from: chr }, raw_name);
      }
    }

    // inconsistent - see gh-1894
    if (unused_opt || type === "var") {
      unuseds.push({
        name: name,
        line: line,
        character: chr
      });
    }
  };

  /**
   * Checks the current scope for unused identifiers
   */
  function _checkForUnused() {
    // function params are handled specially
    // assume that parameters are the only thing declared in the param scope
    if (_current["(type)"] === "functionparams") {
      _checkParams();
      return;
    }
    var curentLabels = _current["(labels)"];
    for (var labelName in curentLabels) {
      if (curentLabels[labelName]) {
        if (curentLabels[labelName]["(type)"] !== "exception" &&
          curentLabels[labelName]["(unused)"]) {
          _warnUnused(labelName, curentLabels[labelName]["(token)"], "var");
        }
      }
    }
  }

  /**
   * Checks the current scope for unused parameters
   * Must be called in a function parameter scope
   */
  function _checkParams() {
    var params = _current["(params)"];

    if (!params) {
      return;
    }

    var param = params.pop();
    var unused_opt;

    while (param) {
      var label = _current["(labels)"][param];

      unused_opt = _getUnusedOption(state.funct["(unusedOption)"]);

      // 'undefined' is a special case for (function(window, undefined) { ... })();
      // patterns.
      if (param === "undefined")
        return;

      if (label["(unused)"]) {
        _warnUnused(param, label["(token)"], "param", state.funct["(unusedOption)"]);
      } else if (unused_opt === "last-param") {
        return;
      }

      param = params.pop();
    }
  }

  /**
   * Finds the relevant label's scope, searching from nearest outwards
   * @returns {Object} the scope the label was found in
   */
  function _getLabel(labelName) {
    for (var i = _scopeStack.length - 1 ; i >= 0; --i) {
      var scopeLabels = _scopeStack[i]["(labels)"];
      if (scopeLabels[labelName]) {
        return scopeLabels;
      }
    }
  }

  function usedSoFarInCurrentFunction(labelName) {
    // used so far in this whole function and any sub functions
    for (var i = _scopeStack.length - 1; i >= 0; i--) {
      var current = _scopeStack[i];
      if (current["(usages)"][labelName]) {
        return current["(usages)"][labelName];
      }
      if (current === _currentFunctBody) {
        break;
      }
    }
    return false;
  }

  function _checkOuterShadow(labelName, token) {

    // only check if shadow is outer
    if (state.option.shadow !== "outer") {
      return;
    }

    var isGlobal = _currentFunctBody["(type)"] === "global",
      isNewFunction = _current["(type)"] === "functionparams";

    var outsideCurrentFunction = !isGlobal;
    for (var i = 0; i < _scopeStack.length; i++) {
      var stackItem = _scopeStack[i];

      if (!isNewFunction && _scopeStack[i + 1] === _currentFunctBody) {
        outsideCurrentFunction = false;
      }
      if (outsideCurrentFunction && stackItem["(labels)"][labelName]) {
        warning("W123", token, labelName);
      }
      if (stackItem["(breakLabels)"][labelName]) {
        warning("W123", token, labelName);
      }
    }
  }

  function _latedefWarning(type, labelName, token) {
    if (state.option.latedef) {
      // if either latedef is strict and this is a function
      //    or this is not a function
      if ((state.option.latedef === true && type === "function") ||
        type !== "function") {
        warning("W003", token, labelName);
      }
    }
  }

  var scopeManagerInst = {

    on: function(names, listener) {
      names.split(" ").forEach(function(name) {
        emitter.on(name, listener);
      });
    },

    isPredefined: function(labelName) {
      return !this.has(labelName) && _.has(_scopeStack[0]["(predefined)"], labelName);
    },

    /**
     * Tell the manager we are entering a new block of code
     * @param {string} [type] - The type of the block. Valid values are
     *                          "functionparams", "catchparams" and
     *                          "functionouter"
     */
    stack: function(type) {
      var previousScope = _current;
      _newScope(type);

      if (!type && previousScope["(type)"] === "functionparams") {

        _current["(isFuncBody)"] = true;
        _current["(context)"] = _currentFunctBody;
        _currentFunctBody = _current;
      }
    },

    unstack: function() {
      // jshint proto: true
      var subScope = _scopeStack.length > 1 ? _scopeStack[_scopeStack.length - 2] : null;
      var isUnstackingFunctionBody = _current === _currentFunctBody,
        isUnstackingFunctionParams = _current["(type)"] === "functionparams",
        isUnstackingFunctionOuter = _current["(type)"] === "functionouter";

      var i, j;
      var currentUsages = _current["(usages)"];
      var currentLabels = _current["(labels)"];
      var usedLabelNameList = Object.keys(currentUsages);

      if (currentUsages.__proto__ && usedLabelNameList.indexOf("__proto__") === -1) {
        usedLabelNameList.push("__proto__");
      }

      for (i = 0; i < usedLabelNameList.length; i++) {
        var usedLabelName = usedLabelNameList[i];

        var usage = currentUsages[usedLabelName];
        var usedLabel = currentLabels[usedLabelName];
        if (usedLabel) {
          var usedLabelType = usedLabel["(type)"];

          if (usedLabel["(useOutsideOfScope)"] && !state.option.funcscope) {
            var usedTokens = usage["(tokens)"];
            if (usedTokens) {
              for (j = 0; j < usedTokens.length; j++) {
                // Keep the consistency of https://github.com/jshint/jshint/issues/2409
                if (usedLabel["(function)"] === usedTokens[j]["(function)"]) {
                  error("W038", usedTokens[j], usedLabelName);
                }
              }
            }
          }

          // mark the label used
          _current["(labels)"][usedLabelName]["(unused)"] = false;

          // check for modifying a const
          if (usedLabelType === "const" && usage["(modified)"]) {
            for (j = 0; j < usage["(modified)"].length; j++) {
              error("E013", usage["(modified)"][j], usedLabelName);
            }
          }

          // check for re-assigning a function declaration
          if ((usedLabelType === "function" || usedLabelType === "class") &&
              usage["(reassigned)"]) {
            for (j = 0; j < usage["(reassigned)"].length; j++) {
              if (!usage["(reassigned)"][j].ignoreW021) {
                warning("W021", usage["(reassigned)"][j], usedLabelName, usedLabelType);
              }
            }
          }
          continue;
        }

        if (isUnstackingFunctionOuter) {
          state.funct["(isCapturing)"] = true;
        }

        if (subScope) {
          // not exiting the global scope, so copy the usage down in case its an out of scope usage
          if (!subScope["(usages)"][usedLabelName]) {
            subScope["(usages)"][usedLabelName] = usage;
            if (isUnstackingFunctionBody) {
              subScope["(usages)"][usedLabelName]["(onlyUsedSubFunction)"] = true;
            }
          } else {
            var subScopeUsage = subScope["(usages)"][usedLabelName];
            subScopeUsage["(modified)"] = subScopeUsage["(modified)"].concat(usage["(modified)"]);
            subScopeUsage["(tokens)"] = subScopeUsage["(tokens)"].concat(usage["(tokens)"]);
            subScopeUsage["(reassigned)"] =
              subScopeUsage["(reassigned)"].concat(usage["(reassigned)"]);
          }
        } else {
          // this is exiting global scope, so we finalise everything here - we are at the end of the file
          if (typeof _current["(predefined)"][usedLabelName] === "boolean") {

            // remove the declared token, so we know it is used
            delete declared[usedLabelName];

            // note it as used so it can be reported
            usedPredefinedAndGlobals[usedLabelName] = marker;

            // check for re-assigning a read-only (set to false) predefined
            if (_current["(predefined)"][usedLabelName] === false && usage["(reassigned)"]) {
              for (j = 0; j < usage["(reassigned)"].length; j++) {
                if (!usage["(reassigned)"][j].ignoreW020) {
                  warning("W020", usage["(reassigned)"][j]);
                }
              }
            }
          }
          else {
            // label usage is not predefined and we have not found a declaration
            // so report as undeclared
            if (usage["(tokens)"]) {
              for (j = 0; j < usage["(tokens)"].length; j++) {
                var undefinedToken = usage["(tokens)"][j];
                // if its not a forgiven undefined (e.g. typof x)
                if (!undefinedToken.forgiveUndef) {
                  // if undef is on and undef was on when the token was defined
                  if (state.option.undef && !undefinedToken.ignoreUndef) {
                    warning("W117", undefinedToken, usedLabelName);
                  }
                  if (impliedGlobals[usedLabelName]) {
                    impliedGlobals[usedLabelName].line.push(undefinedToken.line);
                  } else {
                    impliedGlobals[usedLabelName] = {
                      name: usedLabelName,
                      line: [undefinedToken.line]
                    };
                  }
                }
              }
            }
          }
        }
      }

      // if exiting the global scope, we can warn about declared globals that haven't been used yet
      if (!subScope) {
        Object.keys(declared)
          .forEach(function(labelNotUsed) {
            _warnUnused(labelNotUsed, declared[labelNotUsed], "var");
          });
      }

      // If this is not a function boundary, transfer function-scoped labels to
      // the parent block (a rough simulation of variable hoisting). Previously
      // existing labels in the parent block should take precedence so that things and stuff.
      if (subScope && !isUnstackingFunctionBody &&
        !isUnstackingFunctionParams && !isUnstackingFunctionOuter) {
        var labelNames = Object.keys(currentLabels);
        for (i = 0; i < labelNames.length; i++) {

          var defLabelName = labelNames[i];
          var defLabel = currentLabels[defLabelName];

          if (!defLabel["(blockscoped)"] && defLabel["(type)"] !== "exception") {
            var shadowed = subScope["(labels)"][defLabelName];

            // Do not overwrite a label if it exists in the parent scope
            // because it is shared by adjacent blocks. Copy the `unused`
            // property so that any references found within the current block
            // are counted toward that higher-level declaration.
            if (shadowed) {
              shadowed["(unused)"] &= defLabel["(unused)"];

            // "Hoist" the variable to the parent block, decorating the label
            // so that future references, though technically valid, can be
            // reported as "out-of-scope" in the absence of the `funcscope`
            // option.
            } else {
              defLabel["(useOutsideOfScope)"] =
                // Do not warn about out-of-scope usages in the global scope
                _currentFunctBody["(type)"] !== "global" &&
                // When a higher scope contains a binding for the label, the
                // label is a re-declaration and should not prompt "used
                // out-of-scope" warnings.
                !this.funct.has(defLabelName, { excludeCurrent: true });

              subScope["(labels)"][defLabelName] = defLabel;
            }

            delete currentLabels[defLabelName];
          }
        }
      }

      _checkForUnused();

      _scopeStack.pop();
      if (isUnstackingFunctionBody) {
        _currentFunctBody = _scopeStack[_.findLastIndex(_scopeStack, function(scope) {
          // if function or if global (which is at the bottom so it will only return true if we call back)
          return scope["(isFuncBody)"] || scope["(type)"] === "global";
        })];
      }

      _current = subScope;
    },

    /**
     * Add a param to the current scope
     * @param {string} labelName
     * @param {Token} token
     * @param {string} [type="param"] param type
     */
    addParam: function(labelName, token, type) {
      type = type || "param";

      if (type === "exception") {
        // if defined in the current function
        var previouslyDefinedLabelType = this.funct.labeltype(labelName);
        if (previouslyDefinedLabelType && previouslyDefinedLabelType !== "exception") {
          // and has not been used yet in the current function scope
          if (!state.option.node) {
            warning("W002", state.tokens.next, labelName);
          }
        }
      }

      // The variable was declared in the current scope
      if (_.has(_current["(labels)"], labelName)) {
        _current["(labels)"][labelName].duplicated = true;

      // The variable was declared in an outer scope
      } else {
        // if this scope has the variable defined, it's a re-definition error
        _checkOuterShadow(labelName, token, type);

        _current["(labels)"][labelName] = {
          "(type)" : type,
          "(token)": token,
          "(unused)": true };

        _current["(params)"].push(labelName);
      }

      if (_.has(_current["(usages)"], labelName)) {
        var usage = _current["(usages)"][labelName];
        // if its in a sub function it is not necessarily an error, just latedef
        if (usage["(onlyUsedSubFunction)"]) {
          _latedefWarning(type, labelName, token);
        } else {
          // this is a clear illegal usage for block scoped variables
          warning("E056", token, labelName, type);
        }
      }
    },

    validateParams: function() {
      // This method only concerns errors for function parameters
      if (_currentFunctBody["(type)"] === "global") {
        return;
      }

      var isStrict = state.isStrict();
      var currentFunctParamScope = _currentFunctBody["(parent)"];

      if (!currentFunctParamScope["(params)"]) {
        return;
      }

      currentFunctParamScope["(params)"].forEach(function(labelName) {
        var label = currentFunctParamScope["(labels)"][labelName];

        if (label && label.duplicated) {
          if (isStrict) {
            warning("E011", label["(token)"], labelName);
          } else if (state.option.shadow !== true) {
            warning("W004", label["(token)"], labelName);
          }
        }
      });
    },

    getUsedOrDefinedGlobals: function() {
      // jshint proto: true
      var list = Object.keys(usedPredefinedAndGlobals);

      // If `__proto__` is used as a global variable name, its entry in the
      // lookup table may not be enumerated by `Object.keys` (depending on the
      // environment).
      if (usedPredefinedAndGlobals.__proto__ === marker &&
        list.indexOf("__proto__") === -1) {
        list.push("__proto__");
      }

      return list;
    },

    /**
     * Gets an array of implied globals
     * @returns {Array.<{ name: string, line: Array.<number>}>}
     */
    getImpliedGlobals: function() {
      // jshint proto: true
      var values = _.values(impliedGlobals);
      var hasProto = false;

      // If `__proto__` is an implied global variable, its entry in the lookup
      // table may not be enumerated by `_.values` (depending on the
      // environment).
      if (impliedGlobals.__proto__) {
        hasProto = values.some(function(value) {
          return value.name === "__proto__";
        });

        if (!hasProto) {
          values.push(impliedGlobals.__proto__);
        }
      }

      return values;
    },

    /**
     * Returns a list of unused variables
     * @returns {Array}
     */
    getUnuseds: function() {
      return unuseds;
    },

    has: function(labelName) {
      return Boolean(_getLabel(labelName));
    },

    labeltype: function(labelName) {
      // returns a labels type or null if not present
      var scopeLabels = _getLabel(labelName);
      if (scopeLabels) {
        return scopeLabels[labelName]["(type)"];
      }
      return null;
    },

    /**
     * for the exported options, indicating a variable is used outside the file
     */
    addExported: function(labelName) {
      var globalLabels = _scopeStack[0]["(labels)"];
      if (_.has(declared, labelName)) {
        // remove the declared token, so we know it is used
        delete declared[labelName];
      } else if (_.has(globalLabels, labelName)) {
        globalLabels[labelName]["(unused)"] = false;
      } else {
        for (var i = 1; i < _scopeStack.length; i++) {
          var scope = _scopeStack[i];
          // if `scope.(type)` is not defined, it is a block scope
          if (!scope["(type)"]) {
            if (_.has(scope["(labels)"], labelName) &&
                !scope["(labels)"][labelName]["(blockscoped)"]) {
              scope["(labels)"][labelName]["(unused)"] = false;
              return;
            }
          } else {
            break;
          }
        }
        exported[labelName] = true;
      }
    },

    /**
     * Mark an indentifier as es6 module exported
     */
    setExported: function(labelName, token) {
      this.block.use(labelName, token);
    },

    /**
     * adds an indentifier to the relevant current scope and creates warnings/errors as necessary
     * @param {string} labelName
     * @param {Object} opts
     * @param {String} opts.type - the type of the label e.g. "param", "var", "let, "const", "function"
     * @param {Token} opts.token - the token pointing at the declaration
     */
    addlabel: function(labelName, opts) {

      var type  = opts.type;
      var token = opts.token;
      var isblockscoped = type === "let" || type === "const" || type === "class";
      var isexported    = (isblockscoped ? _current : _currentFunctBody)["(type)"] === "global" &&
                          _.has(exported, labelName);

      // outer shadow check (inner is only on non-block scoped)
      _checkOuterShadow(labelName, token, type);

      // if is block scoped (let or const)
      if (isblockscoped) {

        var declaredInCurrentScope = _current["(labels)"][labelName];
        // for block scoped variables, params are seen in the current scope as the root function
        // scope, so check these too.
        if (!declaredInCurrentScope && _current === _currentFunctBody &&
          _current["(type)"] !== "global") {
          declaredInCurrentScope = !!_currentFunctBody["(parent)"]["(labels)"][labelName];
        }

        // if its not already defined (which is an error, so ignore) and is used in TDZ
        if (!declaredInCurrentScope && _current["(usages)"][labelName]) {
          var usage = _current["(usages)"][labelName];
          // if its in a sub function it is not necessarily an error, just latedef
          if (usage["(onlyUsedSubFunction)"]) {
            _latedefWarning(type, labelName, token);
          } else {
            // this is a clear illegal usage for block scoped variables
            warning("E056", token, labelName, type);
          }
        }

        // if this scope has the variable defined, its a re-definition error
        if (declaredInCurrentScope) {
          warning("E011", token, labelName);
        }
        else if (state.option.shadow === "outer") {

          // if shadow is outer, for block scope we want to detect any shadowing within this function
          if (scopeManagerInst.funct.has(labelName)) {
            warning("W004", token, labelName);
          }
        }

        scopeManagerInst.block.add(labelName, type, token, !isexported);

      } else {

        var declaredInCurrentFunctionScope = scopeManagerInst.funct.has(labelName);

        // check for late definition, ignore if already declared
        if (!declaredInCurrentFunctionScope && usedSoFarInCurrentFunction(labelName)) {
          _latedefWarning(type, labelName, token);
        }

        // defining with a var or a function when a block scope variable of the same name
        // is in scope is an error
        if (scopeManagerInst.funct.has(labelName, { onlyBlockscoped: true })) {
          warning("E011", token, labelName);
        } else if (state.option.shadow !== true) {
          // now since we didn't get any block scope variables, test for var/function
          // shadowing
          if (declaredInCurrentFunctionScope && labelName !== "__proto__") {

            // see https://github.com/jshint/jshint/issues/2400
            if (_currentFunctBody["(type)"] !== "global") {
              warning("W004", token, labelName);
            }
          }
        }

        scopeManagerInst.funct.add(labelName, type, token, !isexported);

        if (_currentFunctBody["(type)"] === "global" && !state.impliedClosure()) {
          usedPredefinedAndGlobals[labelName] = marker;
        }
      }
    },

    funct: {
      /**
       * Returns the label type given certain options
       * @param labelName
       * @param {Object=} options
       * @param {Boolean=} options.onlyBlockscoped - only include block scoped labels
       * @param {Boolean=} options.excludeParams - exclude the param scope
       * @param {Boolean=} options.excludeCurrent - exclude the current scope
       * @returns {String}
       */
      labeltype: function(labelName, options) {
        var onlyBlockscoped = options && options.onlyBlockscoped;
        var excludeParams = options && options.excludeParams;
        var currentScopeIndex = _scopeStack.length - (options && options.excludeCurrent ? 2 : 1);
        for (var i = currentScopeIndex; i >= 0; i--) {
          var current = _scopeStack[i];
          if (current["(labels)"][labelName] &&
            (!onlyBlockscoped || current["(labels)"][labelName]["(blockscoped)"])) {
            return current["(labels)"][labelName]["(type)"];
          }
          var scopeCheck = excludeParams ? _scopeStack[ i - 1 ] : current;
          if (scopeCheck && scopeCheck["(type)"] === "functionparams") {
            return null;
          }
        }
        return null;
      },
      /**
       * Returns if a break label exists in the function scope
       * @param {string} labelName
       * @returns {boolean}
       */
      hasBreakLabel: function(labelName) {
        for (var i = _scopeStack.length - 1; i >= 0; i--) {
          var current = _scopeStack[i];

          if (current["(breakLabels)"][labelName]) {
            return true;
          }
          if (current["(type)"] === "functionparams") {
            return false;
          }
        }
        return false;
      },
      /**
       * Returns if the label is in the current function scope
       * See scopeManager.funct.labelType for options
       */
      has: function(labelName, options) {
        return Boolean(this.labeltype(labelName, options));
      },

      /**
       * Adds a new function scoped variable
       * see block.add for block scoped
       */
      add: function(labelName, type, tok, unused) {
        _current["(labels)"][labelName] = {
          "(type)" : type,
          "(token)": tok,
          "(blockscoped)": false,
          "(function)": _currentFunctBody,
          "(unused)": unused };
      }
    },

    block: {

      /**
       * is the current block global?
       * @returns Boolean
       */
      isGlobal: function() {
        return _current["(type)"] === "global";
      },

      use: function(labelName, token) {

        // if resolves to current function params, then do not store usage just resolve
        // this is because function(a) { var a; a = a; } will resolve to the param, not
        // to the unset var
        // first check the param is used
        var paramScope = _currentFunctBody["(parent)"];
        if (paramScope && paramScope["(labels)"][labelName] &&
          paramScope["(labels)"][labelName]["(type)"] === "param") {

          // then check its not declared by a block scope variable
          if (!scopeManagerInst.funct.has(labelName,
                { excludeParams: true, onlyBlockscoped: true })) {
            paramScope["(labels)"][labelName]["(unused)"] = false;
          }
        }

        if (token && (state.ignored.W117 || state.option.undef === false)) {
          token.ignoreUndef = true;
        }

        _setupUsages(labelName);

        _current["(usages)"][labelName]["(onlyUsedSubFunction)"] = false;

        if (token) {
          token["(function)"] = _currentFunctBody;
          _current["(usages)"][labelName]["(tokens)"].push(token);
        }
      },

      reassign: function(labelName, token) {
        token.ignoreW020 = state.ignored.W020;
        token.ignoreW021 = state.ignored.W021;

        this.modify(labelName, token);

        _current["(usages)"][labelName]["(reassigned)"].push(token);
      },

      modify: function(labelName, token) {

        _setupUsages(labelName);

        _current["(usages)"][labelName]["(onlyUsedSubFunction)"] = false;
        _current["(usages)"][labelName]["(modified)"].push(token);
      },

      /**
       * Adds a new variable
       */
      add: function(labelName, type, tok, unused) {
        _current["(labels)"][labelName] = {
          "(type)" : type,
          "(token)": tok,
          "(blockscoped)": true,
          "(unused)": unused };
      },

      addBreakLabel: function(labelName, opts) {
        var token = opts.token;
        if (scopeManagerInst.funct.hasBreakLabel(labelName)) {
          warning("E011", token, labelName);
        }
        else if (state.option.shadow === "outer") {
          if (scopeManagerInst.funct.has(labelName)) {
            warning("W004", token, labelName);
          } else {
            _checkOuterShadow(labelName, token);
          }
        }
        _current["(breakLabels)"][labelName] = token;
      }
    }
  };
  return scopeManagerInst;
};

module.exports = scopeManager;

},{"events":5,"lodash":12}],19:[function(require,module,exports){
"use strict";
var NameStack = require("./name-stack.js");

var state = {
  syntax: {},

  /**
   * Determine if the code currently being linted is strict mode code.
   *
   * @returns {boolean}
   */
  isStrict: function() {
    return this.directive["use strict"] || this.inClassBody ||
      this.option.module || this.option.strict === "implied";
  },

  /**
   * Determine if the current state warrants a warning for statements outside
   * of strict mode code.
   *
   * While emitting warnings based on function scope would be more intuitive
   * (and less noisy), JSHint observes statement-based semantics in order to
   * preserve legacy behavior.
   *
   * This method does not take the state of the parser into account, making no
   * distinction between global code and function code. Because the "missing
   * 'use strict'" warning is *also* reported at function boundaries, this
   * function interprets `strict` option values `true` and `undefined` as
   * equivalent.
   */
  stmtMissingStrict: function() {
    if (this.option.strict === "global") {
      return true;
    }

    if (this.option.strict === false) {
      return false;
    }

    if (this.option.globalstrict) {
      return true;
    }

    return false;
  },

  allowsGlobalUsd: function() {
    return this.option.strict === "global" || this.option.globalstrict ||
      this.option.module || this.impliedClosure();
  },

  /**
   * Determine if the current configuration describes an environment that is
   * wrapped in an immediately-invoked function expression prior to evaluation.
   *
   * @returns {boolean}
   */
  impliedClosure: function() {
    return this.option.node || this.option.phantom || this.option.browserify;
  },

  // Assumption: chronologically ES3 < ES5 < ES6 < Moz

  inMoz: function() {
    return this.option.moz;
  },

  /**
   * @param {boolean} strict - When `true`, only consider ES6 when in
   *                           "esversion: 6" code.
   */
  inES6: function(strict) {
    if (strict) {
      return this.esVersion === 6;
    }
    return this.option.moz || this.esVersion >= 6;
  },

  /**
   * @param {boolean} strict - When `true`, return `true` only when
   *                           esVersion is exactly 5
   */
  inES5: function(strict) {
    if (strict) {
      return (!this.esVersion || this.esVersion === 5) && !this.option.moz;
    }
    return !this.esVersion || this.esVersion >= 5 || this.option.moz;
  },

  /**
   * Determine the current version of the input language by inspecting the
   * value of all ECMAScript-version-related options. This logic is necessary
   * to ensure compatibility with deprecated options `es3`, `es5`, and
   * `esnext`, and it may be drastically simplified when those options are
   * removed.
   *
   * @returns {string|null} - the name of any incompatible option detected,
   *                          `null` otherwise
   */
  inferEsVersion: function() {
    var badOpt = null;

    if (this.option.esversion) {
      if (this.option.es3) {
        badOpt = "es3";
      } else if (this.option.es5) {
        badOpt = "es5";
      } else if (this.option.esnext) {
        badOpt = "esnext";
      }

      if (badOpt) {
        return badOpt;
      }

      this.esVersion = this.option.esversion;
    } else if (this.option.es3) {
      this.esVersion = 3;
    } else if (this.option.esnext) {
      this.esVersion = 6;
    }

    return null;
  },

  reset: function() {
    this.tokens = {
      prev: null,
      next: null,
      curr: null
    };

    this.option = {};
    this.esVersion = 5;
    this.funct = null;
    this.ignored = {};
    this.directive = {};
    this.jsonMode = false;
    this.jsonWarnings = [];
    this.lines = [];
    this.tab = "";
    this.cache = {}; // Node.JS doesn't have Map. Sniff.
    this.ignoredLines = {};
    this.forinifcheckneeded = false;
    this.nameStack = new NameStack();
    this.inClassBody = false;
  }
};

exports.state = state;

},{"./name-stack.js":15}],20:[function(require,module,exports){
"use strict";

exports.register = function(linter) {
  // Check for properties named __proto__. This special property was
  // deprecated and then re-introduced for ES6.

  linter.on("Identifier", function style_scanProto(data) {
    if (linter.getOption("proto")) {
      return;
    }

    if (data.name === "__proto__") {
      linter.warn("W103", {
        line: data.line,
        char: data.char,
        data: [ data.name, "6" ]
      });
    }
  });

  // Check for properties named __iterator__. This is a special property
  // available only in browsers with JavaScript 1.7 implementation, but
  // it is deprecated for ES6

  linter.on("Identifier", function style_scanIterator(data) {
    if (linter.getOption("iterator")) {
      return;
    }

    if (data.name === "__iterator__") {
      linter.warn("W103", {
        line: data.line,
        char: data.char,
        data: [ data.name ]
      });
    }
  });

  // Check that all identifiers are using camelCase notation.
  // Exceptions: names like MY_VAR and _myVar.

  linter.on("Identifier", function style_scanCamelCase(data) {
    if (!linter.getOption("camelcase")) {
      return;
    }

    if (data.name.replace(/^_+|_+$/g, "").indexOf("_") > -1 && !data.name.match(/^[A-Z0-9_]*$/)) {
      linter.warn("W106", {
        line: data.line,
        char: data.char,
        data: [ data.name ]
      });
    }
  });

  // Enforce consistency in style of quoting.

  linter.on("String", function style_scanQuotes(data) {
    var quotmark = linter.getOption("quotmark");
    var code;

    if (!quotmark) {
      return;
    }

    // If quotmark is set to 'single' warn about all double-quotes.

    if (quotmark === "single" && data.quote !== "'") {
      code = "W109";
    }

    // If quotmark is set to 'double' warn about all single-quotes.

    if (quotmark === "double" && data.quote !== "\"") {
      code = "W108";
    }

    // If quotmark is set to true, remember the first quotation style
    // and then warn about all others.

    if (quotmark === true) {
      if (!linter.getCache("quotmark")) {
        linter.setCache("quotmark", data.quote);
      }

      if (linter.getCache("quotmark") !== data.quote) {
        code = "W110";
      }
    }

    if (code) {
      linter.warn(code, {
        line: data.line,
        char: data.char,
      });
    }
  });

  linter.on("Number", function style_scanNumbers(data) {
    if (data.value.charAt(0) === ".") {
      // Warn about a leading decimal point.
      linter.warn("W008", {
        line: data.line,
        char: data.char,
        data: [ data.value ]
      });
    }

    if (data.value.substr(data.value.length - 1) === ".") {
      // Warn about a trailing decimal point.
      linter.warn("W047", {
        line: data.line,
        char: data.char,
        data: [ data.value ]
      });
    }

    if (/^00+/.test(data.value)) {
      // Multiple leading zeroes.
      linter.warn("W046", {
        line: data.line,
        char: data.char,
        data: [ data.value ]
      });
    }
  });

  // Warn about script URLs.

  linter.on("String", function style_scanJavaScriptURLs(data) {
    var re = /^(?:javascript|jscript|ecmascript|vbscript|livescript)\s*:/i;

    if (linter.getOption("scripturl")) {
      return;
    }

    if (re.test(data.value)) {
      linter.warn("W107", {
        line: data.line,
        char: data.char
      });
    }
  });
};

},{}],21:[function(require,module,exports){
// jshint -W001

"use strict";

// Identifiers provided by the ECMAScript standard.

exports.reservedVars = {
  arguments : false,
  NaN       : false
};

exports.ecmaIdentifiers = {
  3: {
    Array              : false,
    Boolean            : false,
    Date               : false,
    decodeURI          : false,
    decodeURIComponent : false,
    encodeURI          : false,
    encodeURIComponent : false,
    Error              : false,
    "eval"             : false,
    EvalError          : false,
    Function           : false,
    hasOwnProperty     : false,
    isFinite           : false,
    isNaN              : false,
    Math               : false,
    Number             : false,
    Object             : false,
    parseInt           : false,
    parseFloat         : false,
    RangeError         : false,
    ReferenceError     : false,
    RegExp             : false,
    String             : false,
    SyntaxError        : false,
    TypeError          : false,
    URIError           : false
  },
  5: {
    JSON               : false
  },
  6: {
    Map                : false,
    Promise            : false,
    Proxy              : false,
    Reflect            : false,
    Set                : false,
    Symbol             : false,
    WeakMap            : false,
    WeakSet            : false
  }
};

// Global variables commonly provided by a web browser environment.

exports.browser = {
  Audio                : false,
  Blob                 : false,
  addEventListener     : false,
  applicationCache     : false,
  atob                 : false,
  blur                 : false,
  btoa                 : false,
  cancelAnimationFrame : false,
  CanvasGradient       : false,
  CanvasPattern        : false,
  CanvasRenderingContext2D: false,
  CSS                  : false,
  clearInterval        : false,
  clearTimeout         : false,
  close                : false,
  closed               : false,
  Comment              : false,
  CompositionEvent     : false,
  CustomEvent          : false,
  DOMParser            : false,
  defaultStatus        : false,
  Document             : false,
  document             : false,
  DocumentFragment     : false,
  Element              : false,
  ElementTimeControl   : false,
  Event                : false,
  event                : false,
  fetch                : false,
  File                 : false,
  FileList             : false,
  FileReader           : false,
  FormData             : false,
  focus                : false,
  frames               : false,
  getComputedStyle     : false,
  HTMLElement          : false,
  HTMLAnchorElement    : false,
  HTMLBaseElement      : false,
  HTMLBlockquoteElement: false,
  HTMLBodyElement      : false,
  HTMLBRElement        : false,
  HTMLButtonElement    : false,
  HTMLCanvasElement    : false,
  HTMLCollection       : false,
  HTMLDirectoryElement : false,
  HTMLDivElement       : false,
  HTMLDListElement     : false,
  HTMLFieldSetElement  : false,
  HTMLFontElement      : false,
  HTMLFormElement      : false,
  HTMLFrameElement     : false,
  HTMLFrameSetElement  : false,
  HTMLHeadElement      : false,
  HTMLHeadingElement   : false,
  HTMLHRElement        : false,
  HTMLHtmlElement      : false,
  HTMLIFrameElement    : false,
  HTMLImageElement     : false,
  HTMLInputElement     : false,
  HTMLIsIndexElement   : false,
  HTMLLabelElement     : false,
  HTMLLayerElement     : false,
  HTMLLegendElement    : false,
  HTMLLIElement        : false,
  HTMLLinkElement      : false,
  HTMLMapElement       : false,
  HTMLMenuElement      : false,
  HTMLMetaElement      : false,
  HTMLModElement       : false,
  HTMLObjectElement    : false,
  HTMLOListElement     : false,
  HTMLOptGroupElement  : false,
  HTMLOptionElement    : false,
  HTMLParagraphElement : false,
  HTMLParamElement     : false,
  HTMLPreElement       : false,
  HTMLQuoteElement     : false,
  HTMLScriptElement    : false,
  HTMLSelectElement    : false,
  HTMLStyleElement     : false,
  HTMLTableCaptionElement: false,
  HTMLTableCellElement : false,
  HTMLTableColElement  : false,
  HTMLTableElement     : false,
  HTMLTableRowElement  : false,
  HTMLTableSectionElement: false,
  HTMLTemplateElement  : false,
  HTMLTextAreaElement  : false,
  HTMLTitleElement     : false,
  HTMLUListElement     : false,
  HTMLVideoElement     : false,
  history              : false,
  Image                : false,
  Intl                 : false,
  length               : false,
  localStorage         : false,
  location             : false,
  matchMedia           : false,
  MessageChannel       : false,
  MessageEvent         : false,
  MessagePort          : false,
  MouseEvent           : false,
  moveBy               : false,
  moveTo               : false,
  MutationObserver     : false,
  name                 : false,
  Node                 : false,
  NodeFilter           : false,
  NodeList             : false,
  Notification         : false,
  navigator            : false,
  onbeforeunload       : true,
  onblur               : true,
  onerror              : true,
  onfocus              : true,
  onload               : true,
  onresize             : true,
  onunload             : true,
  open                 : false,
  openDatabase         : false,
  opener               : false,
  Option               : false,
  parent               : false,
  performance          : false,
  print                : false,
  Range                : false,
  requestAnimationFrame : false,
  removeEventListener  : false,
  resizeBy             : false,
  resizeTo             : false,
  screen               : false,
  scroll               : false,
  scrollBy             : false,
  scrollTo             : false,
  sessionStorage       : false,
  setInterval          : false,
  setTimeout           : false,
  SharedWorker         : false,
  status               : false,
  SVGAElement          : false,
  SVGAltGlyphDefElement: false,
  SVGAltGlyphElement   : false,
  SVGAltGlyphItemElement: false,
  SVGAngle             : false,
  SVGAnimateColorElement: false,
  SVGAnimateElement    : false,
  SVGAnimateMotionElement: false,
  SVGAnimateTransformElement: false,
  SVGAnimatedAngle     : false,
  SVGAnimatedBoolean   : false,
  SVGAnimatedEnumeration: false,
  SVGAnimatedInteger   : false,
  SVGAnimatedLength    : false,
  SVGAnimatedLengthList: false,
  SVGAnimatedNumber    : false,
  SVGAnimatedNumberList: false,
  SVGAnimatedPathData  : false,
  SVGAnimatedPoints    : false,
  SVGAnimatedPreserveAspectRatio: false,
  SVGAnimatedRect      : false,
  SVGAnimatedString    : false,
  SVGAnimatedTransformList: false,
  SVGAnimationElement  : false,
  SVGCSSRule           : false,
  SVGCircleElement     : false,
  SVGClipPathElement   : false,
  SVGColor             : false,
  SVGColorProfileElement: false,
  SVGColorProfileRule  : false,
  SVGComponentTransferFunctionElement: false,
  SVGCursorElement     : false,
  SVGDefsElement       : false,
  SVGDescElement       : false,
  SVGDocument          : false,
  SVGElement           : false,
  SVGElementInstance   : false,
  SVGElementInstanceList: false,
  SVGEllipseElement    : false,
  SVGExternalResourcesRequired: false,
  SVGFEBlendElement    : false,
  SVGFEColorMatrixElement: false,
  SVGFEComponentTransferElement: false,
  SVGFECompositeElement: false,
  SVGFEConvolveMatrixElement: false,
  SVGFEDiffuseLightingElement: false,
  SVGFEDisplacementMapElement: false,
  SVGFEDistantLightElement: false,
  SVGFEFloodElement    : false,
  SVGFEFuncAElement    : false,
  SVGFEFuncBElement    : false,
  SVGFEFuncGElement    : false,
  SVGFEFuncRElement    : false,
  SVGFEGaussianBlurElement: false,
  SVGFEImageElement    : false,
  SVGFEMergeElement    : false,
  SVGFEMergeNodeElement: false,
  SVGFEMorphologyElement: false,
  SVGFEOffsetElement   : false,
  SVGFEPointLightElement: false,
  SVGFESpecularLightingElement: false,
  SVGFESpotLightElement: false,
  SVGFETileElement     : false,
  SVGFETurbulenceElement: false,
  SVGFilterElement     : false,
  SVGFilterPrimitiveStandardAttributes: false,
  SVGFitToViewBox      : false,
  SVGFontElement       : false,
  SVGFontFaceElement   : false,
  SVGFontFaceFormatElement: false,
  SVGFontFaceNameElement: false,
  SVGFontFaceSrcElement: false,
  SVGFontFaceUriElement: false,
  SVGForeignObjectElement: false,
  SVGGElement          : false,
  SVGGlyphElement      : false,
  SVGGlyphRefElement   : false,
  SVGGradientElement   : false,
  SVGHKernElement      : false,
  SVGICCColor          : false,
  SVGImageElement      : false,
  SVGLangSpace         : false,
  SVGLength            : false,
  SVGLengthList        : false,
  SVGLineElement       : false,
  SVGLinearGradientElement: false,
  SVGLocatable         : false,
  SVGMPathElement      : false,
  SVGMarkerElement     : false,
  SVGMaskElement       : false,
  SVGMatrix            : false,
  SVGMetadataElement   : false,
  SVGMissingGlyphElement: false,
  SVGNumber            : false,
  SVGNumberList        : false,
  SVGPaint             : false,
  SVGPathElement       : false,
  SVGPathSeg           : false,
  SVGPathSegArcAbs     : false,
  SVGPathSegArcRel     : false,
  SVGPathSegClosePath  : false,
  SVGPathSegCurvetoCubicAbs: false,
  SVGPathSegCurvetoCubicRel: false,
  SVGPathSegCurvetoCubicSmoothAbs: false,
  SVGPathSegCurvetoCubicSmoothRel: false,
  SVGPathSegCurvetoQuadraticAbs: false,
  SVGPathSegCurvetoQuadraticRel: false,
  SVGPathSegCurvetoQuadraticSmoothAbs: false,
  SVGPathSegCurvetoQuadraticSmoothRel: false,
  SVGPathSegLinetoAbs  : false,
  SVGPathSegLinetoHorizontalAbs: false,
  SVGPathSegLinetoHorizontalRel: false,
  SVGPathSegLinetoRel  : false,
  SVGPathSegLinetoVerticalAbs: false,
  SVGPathSegLinetoVerticalRel: false,
  SVGPathSegList       : false,
  SVGPathSegMovetoAbs  : false,
  SVGPathSegMovetoRel  : false,
  SVGPatternElement    : false,
  SVGPoint             : false,
  SVGPointList         : false,
  SVGPolygonElement    : false,
  SVGPolylineElement   : false,
  SVGPreserveAspectRatio: false,
  SVGRadialGradientElement: false,
  SVGRect              : false,
  SVGRectElement       : false,
  SVGRenderingIntent   : false,
  SVGSVGElement        : false,
  SVGScriptElement     : false,
  SVGSetElement        : false,
  SVGStopElement       : false,
  SVGStringList        : false,
  SVGStylable          : false,
  SVGStyleElement      : false,
  SVGSwitchElement     : false,
  SVGSymbolElement     : false,
  SVGTRefElement       : false,
  SVGTSpanElement      : false,
  SVGTests             : false,
  SVGTextContentElement: false,
  SVGTextElement       : false,
  SVGTextPathElement   : false,
  SVGTextPositioningElement: false,
  SVGTitleElement      : false,
  SVGTransform         : false,
  SVGTransformList     : false,
  SVGTransformable     : false,
  SVGURIReference      : false,
  SVGUnitTypes         : false,
  SVGUseElement        : false,
  SVGVKernElement      : false,
  SVGViewElement       : false,
  SVGViewSpec          : false,
  SVGZoomAndPan        : false,
  Text                 : false,
  TextDecoder          : false,
  TextEncoder          : false,
  TimeEvent            : false,
  top                  : false,
  URL                  : false,
  WebGLActiveInfo      : false,
  WebGLBuffer          : false,
  WebGLContextEvent    : false,
  WebGLFramebuffer     : false,
  WebGLProgram         : false,
  WebGLRenderbuffer    : false,
  WebGLRenderingContext: false,
  WebGLShader          : false,
  WebGLShaderPrecisionFormat: false,
  WebGLTexture         : false,
  WebGLUniformLocation : false,
  WebSocket            : false,
  window               : false,
  Window               : false,
  Worker               : false,
  XDomainRequest       : false,
  XMLHttpRequest       : false,
  XMLSerializer        : false,
  XPathEvaluator       : false,
  XPathException       : false,
  XPathExpression      : false,
  XPathNamespace       : false,
  XPathNSResolver      : false,
  XPathResult          : false
};

exports.devel = {
  alert  : false,
  confirm: false,
  console: false,
  Debug  : false,
  opera  : false,
  prompt : false
};

exports.worker = {
  importScripts  : true,
  postMessage    : true,
  self           : true,
  FileReaderSync : true
};

// Widely adopted global names that are not part of ECMAScript standard
exports.nonstandard = {
  escape  : false,
  unescape: false
};

// Globals provided by popular JavaScript environments.

exports.couch = {
  "require" : false,
  respond   : false,
  getRow    : false,
  emit      : false,
  send      : false,
  start     : false,
  sum       : false,
  log       : false,
  exports   : false,
  module    : false,
  provides  : false
};

exports.node = {
  __filename    : false,
  __dirname     : false,
  GLOBAL        : false,
  global        : false,
  module        : false,
  require       : false,

  // These globals are writeable because Node allows the following
  // usage pattern: var Buffer = require("buffer").Buffer;

  Buffer        : true,
  console       : true,
  exports       : true,
  process       : true,
  setTimeout    : true,
  clearTimeout  : true,
  setInterval   : true,
  clearInterval : true,
  setImmediate  : true, // v0.9.1+
  clearImmediate: true  // v0.9.1+
};

exports.browserify = {
  __filename    : false,
  __dirname     : false,
  global        : false,
  module        : false,
  require       : false,
  Buffer        : true,
  exports       : true,
  process       : true
};

exports.phantom = {
  phantom      : true,
  require      : true,
  WebPage      : true,
  console      : true, // in examples, but undocumented
  exports      : true  // v1.7+
};

exports.qunit = {
  asyncTest      : false,
  deepEqual      : false,
  equal          : false,
  expect         : false,
  module         : false,
  notDeepEqual   : false,
  notEqual       : false,
  notOk          : false,
  notPropEqual   : false,
  notStrictEqual : false,
  ok             : false,
  propEqual      : false,
  QUnit          : false,
  raises         : false,
  start          : false,
  stop           : false,
  strictEqual    : false,
  test           : false,
  "throws"       : false
};

exports.rhino = {
  defineClass  : false,
  deserialize  : false,
  gc           : false,
  help         : false,
  importClass  : false,
  importPackage: false,
  "java"       : false,
  load         : false,
  loadClass    : false,
  Packages     : false,
  print        : false,
  quit         : false,
  readFile     : false,
  readUrl      : false,
  runCommand   : false,
  seal         : false,
  serialize    : false,
  spawn        : false,
  sync         : false,
  toint32      : false,
  version      : false
};

exports.shelljs = {
  target       : false,
  echo         : false,
  exit         : false,
  cd           : false,
  pwd          : false,
  ls           : false,
  find         : false,
  cp           : false,
  rm           : false,
  mv           : false,
  mkdir        : false,
  test         : false,
  cat          : false,
  sed          : false,
  grep         : false,
  which        : false,
  dirs         : false,
  pushd        : false,
  popd         : false,
  env          : false,
  exec         : false,
  chmod        : false,
  config       : false,
  error        : false,
  tempdir      : false
};

exports.typed = {
  ArrayBuffer         : false,
  ArrayBufferView     : false,
  DataView            : false,
  Float32Array        : false,
  Float64Array        : false,
  Int16Array          : false,
  Int32Array          : false,
  Int8Array           : false,
  Uint16Array         : false,
  Uint32Array         : false,
  Uint8Array          : false,
  Uint8ClampedArray   : false
};

exports.wsh = {
  ActiveXObject            : true,
  Enumerator               : true,
  GetObject                : true,
  ScriptEngine             : true,
  ScriptEngineBuildVersion : true,
  ScriptEngineMajorVersion : true,
  ScriptEngineMinorVersion : true,
  VBArray                  : true,
  WSH                      : true,
  WScript                  : true,
  XDomainRequest           : true
};

// Globals provided by popular JavaScript libraries.

exports.dojo = {
  dojo     : false,
  dijit    : false,
  dojox    : false,
  define   : false,
  "require": false
};

exports.jquery = {
  "$"    : false,
  jQuery : false
};

exports.mootools = {
  "$"           : false,
  "$$"          : false,
  Asset         : false,
  Browser       : false,
  Chain         : false,
  Class         : false,
  Color         : false,
  Cookie        : false,
  Core          : false,
  Document      : false,
  DomReady      : false,
  DOMEvent      : false,
  DOMReady      : false,
  Drag          : false,
  Element       : false,
  Elements      : false,
  Event         : false,
  Events        : false,
  Fx            : false,
  Group         : false,
  Hash          : false,
  HtmlTable     : false,
  IFrame        : false,
  IframeShim    : false,
  InputValidator: false,
  instanceOf    : false,
  Keyboard      : false,
  Locale        : false,
  Mask          : false,
  MooTools      : false,
  Native        : false,
  Options       : false,
  OverText      : false,
  Request       : false,
  Scroller      : false,
  Slick         : false,
  Slider        : false,
  Sortables     : false,
  Spinner       : false,
  Swiff         : false,
  Tips          : false,
  Type          : false,
  typeOf        : false,
  URI           : false,
  Window        : false
};

exports.prototypejs = {
  "$"               : false,
  "$$"              : false,
  "$A"              : false,
  "$F"              : false,
  "$H"              : false,
  "$R"              : false,
  "$break"          : false,
  "$continue"       : false,
  "$w"              : false,
  Abstract          : false,
  Ajax              : false,
  Class             : false,
  Enumerable        : false,
  Element           : false,
  Event             : false,
  Field             : false,
  Form              : false,
  Hash              : false,
  Insertion         : false,
  ObjectRange       : false,
  PeriodicalExecuter: false,
  Position          : false,
  Prototype         : false,
  Selector          : false,
  Template          : false,
  Toggle            : false,
  Try               : false,
  Autocompleter     : false,
  Builder           : false,
  Control           : false,
  Draggable         : false,
  Draggables        : false,
  Droppables        : false,
  Effect            : false,
  Sortable          : false,
  SortableObserver  : false,
  Sound             : false,
  Scriptaculous     : false
};

exports.yui = {
  YUI       : false,
  Y         : false,
  YUI_config: false
};

exports.mocha = {
  // Global (for config etc.)
  mocha       : false,
  // BDD
  describe    : false,
  xdescribe   : false,
  it          : false,
  xit         : false,
  context     : false,
  xcontext    : false,
  before      : false,
  after       : false,
  beforeEach  : false,
  afterEach   : false,
  // TDD
  suite         : false,
  test          : false,
  setup         : false,
  teardown      : false,
  suiteSetup    : false,
  suiteTeardown : false
};

exports.jasmine = {
  jasmine     : false,
  describe    : false,
  xdescribe   : false,
  it          : false,
  xit         : false,
  beforeEach  : false,
  afterEach   : false,
  setFixtures : false,
  loadFixtures: false,
  spyOn       : false,
  expect      : false,
  // Jasmine 1.3
  runs        : false,
  waitsFor    : false,
  waits       : false,
  // Jasmine 2.1
  beforeAll   : false,
  afterAll    : false,
  fail        : false,
  fdescribe   : false,
  fit         : false,
  pending     : false
};

},{}],"jshint":[function(require,module,exports){
/*!
 * JSHint, by JSHint Community.
 *
 * This file (and this file only) is licensed under the same slightly modified
 * MIT license that JSLint is. It stops evil-doers everywhere:
 *
 *   Copyright (c) 2002 Douglas Crockford  (www.JSLint.com)
 *
 *   Permission is hereby granted, free of charge, to any person obtaining
 *   a copy of this software and associated documentation files (the "Software"),
 *   to deal in the Software without restriction, including without limitation
 *   the rights to use, copy, modify, merge, publish, distribute, sublicense,
 *   and/or sell copies of the Software, and to permit persons to whom
 *   the Software is furnished to do so, subject to the following conditions:
 *
 *   The above copyright notice and this permission notice shall be included
 *   in all copies or substantial portions of the Software.
 *
 *   The Software shall be used for Good, not Evil.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 *   DEALINGS IN THE SOFTWARE.
 *
 */

/*jshint quotmark:double */
/*global console:true */
/*exported console */

var _            = require("lodash");
var events       = require("events");
var vars         = require("./vars.js");
var messages     = require("./messages.js");
var Lexer        = require("./lex.js").Lexer;
var reg          = require("./reg.js");
var state        = require("./state.js").state;
var style        = require("./style.js");
var options      = require("./options.js");
var scopeManager = require("./scope-manager.js");

// We need this module here because environments such as IE and Rhino
// don't necessarilly expose the 'console' API and browserify uses
// it to log things. It's a sad state of affair, really.
var console = require("console-browserify");

// We build the application inside a function so that we produce only a singleton
// variable. That function will be invoked immediately, and its return value is
// the JSHINT function itself.

var JSHINT = (function() {
  "use strict";

  var api, // Extension API

    // These are operators that should not be used with the ! operator.
    bang = {
      "<"  : true,
      "<=" : true,
      "==" : true,
      "===": true,
      "!==": true,
      "!=" : true,
      ">"  : true,
      ">=" : true,
      "+"  : true,
      "-"  : true,
      "*"  : true,
      "/"  : true,
      "%"  : true
    },

    declared, // Globals that were declared using /*global ... */ syntax.

    functionicity = [
      "closure", "exception", "global", "label",
      "outer", "unused", "var"
    ],

    functions, // All of the functions

    inblock,
    indent,
    lookahead,
    lex,
    member,
    membersOnly,
    predefined,    // Global variables defined by option

    stack,
    urls,

    extraModules = [],
    emitter = new events.EventEmitter();

  function checkOption(name, t) {
    name = name.trim();

    if (/^[+-]W\d{3}$/g.test(name)) {
      return true;
    }

    if (options.validNames.indexOf(name) === -1) {
      if (t.type !== "jslint" && !_.has(options.removed, name)) {
        error("E001", t, name);
        return false;
      }
    }

    return true;
  }

  function isString(obj) {
    return Object.prototype.toString.call(obj) === "[object String]";
  }

  function isIdentifier(tkn, value) {
    if (!tkn)
      return false;

    if (!tkn.identifier || tkn.value !== value)
      return false;

    return true;
  }

  function isReserved(token) {
    if (!token.reserved) {
      return false;
    }
    var meta = token.meta;

    if (meta && meta.isFutureReservedWord) {
      if (meta.moduleOnly && !state.option.module) {
        return false;
      }

      if (state.inES5()) {
        // ES3 FutureReservedWord in an ES5 environment.
        if (!meta.es5) {
          return false;
        }

        // Some ES5 FutureReservedWord identifiers are active only
        // within a strict mode environment.
        if (meta.strictOnly) {
          if (!state.option.strict && !state.isStrict()) {
            return false;
          }
        }

        if (token.isProperty) {
          return false;
        }
      }
    }

    return true;
  }

  function supplant(str, data) {
    return str.replace(/\{([^{}]*)\}/g, function(a, b) {
      var r = data[b];
      return typeof r === "string" || typeof r === "number" ? r : a;
    });
  }

  function combine(dest, src) {
    Object.keys(src).forEach(function(name) {
      if (_.has(JSHINT.blacklist, name)) return;
      dest[name] = src[name];
    });
  }

  function processenforceall() {
    if (state.option.enforceall) {
      for (var enforceopt in options.bool.enforcing) {
        if (state.option[enforceopt] === undefined &&
            !options.noenforceall[enforceopt]) {
          state.option[enforceopt] = true;
        }
      }
      for (var relaxopt in options.bool.relaxing) {
        if (state.option[relaxopt] === undefined) {
          state.option[relaxopt] = false;
        }
      }
    }
  }

  function assume() {
    var badESOpt = null;
    processenforceall();

    /**
     * TODO: Remove in JSHint 3
     */
    badESOpt = state.inferEsVersion();
    if (badESOpt) {
      quit("E059", state.tokens.next, "esversion", badESOpt);
    }

    if (state.inES5()) {
      combine(predefined, vars.ecmaIdentifiers[5]);
    }

    if (state.inES6()) {
      combine(predefined, vars.ecmaIdentifiers[6]);
    }

    /**
     * Use `in` to check for the presence of any explicitly-specified value for
     * `globalstrict` because both `true` and `false` should trigger an error.
     */
    if (state.option.strict === "global" && "globalstrict" in state.option) {
      quit("E059", state.tokens.next, "strict", "globalstrict");
    }

    if (state.option.module) {
      /**
       * TODO: Extend this restriction to *all* ES6-specific options.
       */
      if (!state.inES6()) {
        warning("W134", state.tokens.next, "module", 6);
      }
    }

    if (state.option.couch) {
      combine(predefined, vars.couch);
    }

    if (state.option.qunit) {
      combine(predefined, vars.qunit);
    }

    if (state.option.rhino) {
      combine(predefined, vars.rhino);
    }

    if (state.option.shelljs) {
      combine(predefined, vars.shelljs);
      combine(predefined, vars.node);
    }
    if (state.option.typed) {
      combine(predefined, vars.typed);
    }

    if (state.option.phantom) {
      combine(predefined, vars.phantom);
    }

    if (state.option.prototypejs) {
      combine(predefined, vars.prototypejs);
    }

    if (state.option.node) {
      combine(predefined, vars.node);
      combine(predefined, vars.typed);
    }

    if (state.option.devel) {
      combine(predefined, vars.devel);
    }

    if (state.option.dojo) {
      combine(predefined, vars.dojo);
    }

    if (state.option.browser) {
      combine(predefined, vars.browser);
      combine(predefined, vars.typed);
    }

    if (state.option.browserify) {
      combine(predefined, vars.browser);
      combine(predefined, vars.typed);
      combine(predefined, vars.browserify);
    }

    if (state.option.nonstandard) {
      combine(predefined, vars.nonstandard);
    }

    if (state.option.jasmine) {
      combine(predefined, vars.jasmine);
    }

    if (state.option.jquery) {
      combine(predefined, vars.jquery);
    }

    if (state.option.mootools) {
      combine(predefined, vars.mootools);
    }

    if (state.option.worker) {
      combine(predefined, vars.worker);
    }

    if (state.option.wsh) {
      combine(predefined, vars.wsh);
    }

    if (state.option.yui) {
      combine(predefined, vars.yui);
    }

    if (state.option.mocha) {
      combine(predefined, vars.mocha);
    }
  }

  // Produce an error warning.
  function quit(code, token, a, b) {
    var percentage = Math.floor((token.line / state.lines.length) * 100);
    var message = messages.errors[code].desc;

    var exception = {
      name: "JSHintError",
      line: token.line,
      character: token.from,
      message: message + " (" + percentage + "% scanned).",
      raw: message,
      code: code,
      a: a,
      b: b
    };

    exception.reason = supplant(message, exception) + " (" + percentage +
      "% scanned).";

    throw exception;
  }

  function removeIgnoredMessages() {
    var ignored = state.ignoredLines;

    if (_.isEmpty(ignored)) return;
    JSHINT.errors = _.reject(JSHINT.errors, function(err) { return ignored[err.line] });
  }

  function warning(code, t, a, b, c, d) {
    var ch, l, w, msg;

    if (/^W\d{3}$/.test(code)) {
      if (state.ignored[code])
        return;

      msg = messages.warnings[code];
    } else if (/E\d{3}/.test(code)) {
      msg = messages.errors[code];
    } else if (/I\d{3}/.test(code)) {
      msg = messages.info[code];
    }

    t = t || state.tokens.next || {};
    if (t.id === "(end)") {  // `~
      t = state.tokens.curr;
    }

    l = t.line;
    ch = t.from;

    w = {
      id: "(error)",
      raw: msg.desc,
      code: msg.code,
      evidence: state.lines[l - 1] || "",
      line: l,
      character: ch,
      scope: JSHINT.scope,
      a: a,
      b: b,
      c: c,
      d: d
    };

    w.reason = supplant(msg.desc, w);
    JSHINT.errors.push(w);

    removeIgnoredMessages();

    if (JSHINT.errors.length >= state.option.maxerr)
      quit("E043", t);

    return w;
  }

  function warningAt(m, l, ch, a, b, c, d) {
    return warning(m, {
      line: l,
      from: ch
    }, a, b, c, d);
  }

  function error(m, t, a, b, c, d) {
    warning(m, t, a, b, c, d);
  }

  function errorAt(m, l, ch, a, b, c, d) {
    return error(m, {
      line: l,
      from: ch
    }, a, b, c, d);
  }

  // Tracking of "internal" scripts, like eval containing a static string
  function addInternalSrc(elem, src) {
    var i;
    i = {
      id: "(internal)",
      elem: elem,
      value: src
    };
    JSHINT.internals.push(i);
    return i;
  }

  function doOption() {
    var nt = state.tokens.next;
    var body = nt.body.split(",").map(function(s) { return s.trim(); });

    var predef = {};
    if (nt.type === "globals") {
      body.forEach(function(g, idx) {
        g = g.split(":");
        var key = (g[0] || "").trim();
        var val = (g[1] || "").trim();

        if (key === "-" || !key.length) {
          // Ignore trailing comma
          if (idx > 0 && idx === body.length - 1) {
            return;
          }
          error("E002", nt);
          return;
        }

        if (key.charAt(0) === "-") {
          key = key.slice(1);
          val = false;

          JSHINT.blacklist[key] = key;
          delete predefined[key];
        } else {
          predef[key] = (val === "true");
        }
      });

      combine(predefined, predef);

      for (var key in predef) {
        if (_.has(predef, key)) {
          declared[key] = nt;
        }
      }
    }

    if (nt.type === "exported") {
      body.forEach(function(e, idx) {
        if (!e.length) {
          // Ignore trailing comma
          if (idx > 0 && idx === body.length - 1) {
            return;
          }
          error("E002", nt);
          return;
        }

        state.funct["(scope)"].addExported(e);
      });
    }

    if (nt.type === "members") {
      membersOnly = membersOnly || {};

      body.forEach(function(m) {
        var ch1 = m.charAt(0);
        var ch2 = m.charAt(m.length - 1);

        if (ch1 === ch2 && (ch1 === "\"" || ch1 === "'")) {
          m = m
            .substr(1, m.length - 2)
            .replace("\\\"", "\"");
        }

        membersOnly[m] = false;
      });
    }

    var numvals = [
      "maxstatements",
      "maxparams",
      "maxdepth",
      "maxcomplexity",
      "maxerr",
      "maxlen",
      "indent"
    ];

    if (nt.type === "jshint" || nt.type === "jslint") {
      body.forEach(function(g) {
        g = g.split(":");
        var key = (g[0] || "").trim();
        var val = (g[1] || "").trim();

        if (!checkOption(key, nt)) {
          return;
        }

        if (numvals.indexOf(key) >= 0) {
          // GH988 - numeric options can be disabled by setting them to `false`
          if (val !== "false") {
            val = +val;

            if (typeof val !== "number" || !isFinite(val) || val <= 0 || Math.floor(val) !== val) {
              error("E032", nt, g[1].trim());
              return;
            }

            state.option[key] = val;
          } else {
            state.option[key] = key === "indent" ? 4 : false;
          }

          return;
        }

        if (key === "validthis") {
          // `validthis` is valid only within a function scope.

          if (state.funct["(global)"])
            return void error("E009");

          if (val !== "true" && val !== "false")
            return void error("E002", nt);

          state.option.validthis = (val === "true");
          return;
        }

        if (key === "quotmark") {
          switch (val) {
          case "true":
          case "false":
            state.option.quotmark = (val === "true");
            break;
          case "double":
          case "single":
            state.option.quotmark = val;
            break;
          default:
            error("E002", nt);
          }
          return;
        }

        if (key === "shadow") {
          switch (val) {
          case "true":
            state.option.shadow = true;
            break;
          case "outer":
            state.option.shadow = "outer";
            break;
          case "false":
          case "inner":
            state.option.shadow = "inner";
            break;
          default:
            error("E002", nt);
          }
          return;
        }

        if (key === "unused") {
          switch (val) {
          case "true":
            state.option.unused = true;
            break;
          case "false":
            state.option.unused = false;
            break;
          case "vars":
          case "strict":
            state.option.unused = val;
            break;
          default:
            error("E002", nt);
          }
          return;
        }

        if (key === "latedef") {
          switch (val) {
          case "true":
            state.option.latedef = true;
            break;
          case "false":
            state.option.latedef = false;
            break;
          case "nofunc":
            state.option.latedef = "nofunc";
            break;
          default:
            error("E002", nt);
          }
          return;
        }

        if (key === "ignore") {
          switch (val) {
          case "line":
            state.ignoredLines[nt.line] = true;
            removeIgnoredMessages();
            break;
          default:
            error("E002", nt);
          }
          return;
        }

        if (key === "strict") {
          switch (val) {
          case "true":
            state.option.strict = true;
            break;
          case "false":
            state.option.strict = false;
            break;
          case "global":
          case "implied":
            state.option.strict = val;
            break;
          default:
            error("E002", nt);
          }
          return;
        }

        if (key === "module") {
          /**
           * TODO: Extend this restriction to *all* "environmental" options.
           */
          if (!hasParsedCode(state.funct)) {
            error("E055", state.tokens.next, "module");
          }
        }

        if (key === "esversion") {
          switch (val) {
          case "3":
          case "5":
          case "6":
            state.option.moz = false;
            state.option.esversion = +val;
            break;
          case "2015":
            state.option.moz = false;
            state.option.esversion = 6;
            break;
          default:
            error("E002", nt);
          }
          if (!hasParsedCode(state.funct)) {
            error("E055", state.tokens.next, "esversion");
          }
          return;
        }

        var match = /^([+-])(W\d{3})$/g.exec(key);
        if (match) {
          // ignore for -W..., unignore for +W...
          state.ignored[match[2]] = (match[1] === "-");
          return;
        }

        var tn;
        if (val === "true" || val === "false") {
          if (nt.type === "jslint") {
            tn = options.renamed[key] || key;
            state.option[tn] = (val === "true");

            if (options.inverted[tn] !== undefined) {
              state.option[tn] = !state.option[tn];
            }
          } else {
            state.option[key] = (val === "true");
          }

          return;
        }

        error("E002", nt);
      });

      assume();
    }
  }

  // We need a peek function. If it has an argument, it peeks that much farther
  // ahead. It is used to distinguish
  //     for ( var i in ...
  // from
  //     for ( var i = ...

  function peek(p) {
    var i = p || 0, j = lookahead.length, t;

    if (i < j) {
      return lookahead[i];
    }

    while (j <= i) {
      t = lookahead[j];
      if (!t) {
        t = lookahead[j] = lex.token();
      }
      j += 1;
    }

    // Peeking past the end of the program should produce the "(end)" token.
    if (!t && state.tokens.next.id === "(end)") {
      return state.tokens.next;
    }

    return t;
  }

  function peekIgnoreEOL() {
    var i = 0;
    var t;
    do {
      t = peek(i++);
    } while (t.id === "(endline)");
    return t;
  }

  // Produce the next token. It looks for programming errors.

  function advance(id, t) {

    switch (state.tokens.curr.id) {
    case "(number)":
      if (state.tokens.next.id === ".") {
        warning("W005", state.tokens.curr);
      }
      break;
    case "-":
      if (state.tokens.next.id === "-" || state.tokens.next.id === "--") {
        warning("W006");
      }
      break;
    case "+":
      if (state.tokens.next.id === "+" || state.tokens.next.id === "++") {
        warning("W007");
      }
      break;
    }

    if (id && state.tokens.next.id !== id) {
      if (t) {
        if (state.tokens.next.id === "(end)") {
          error("E019", t, t.id);
        } else {
          error("E020", state.tokens.next, id, t.id, t.line, state.tokens.next.value);
        }
      } else if (state.tokens.next.type !== "(identifier)" || state.tokens.next.value !== id) {
        warning("W116", state.tokens.next, id, state.tokens.next.value);
      }
    }

    state.tokens.prev = state.tokens.curr;
    state.tokens.curr = state.tokens.next;
    for (;;) {
      state.tokens.next = lookahead.shift() || lex.token();

      if (!state.tokens.next) { // No more tokens left, give up
        quit("E041", state.tokens.curr);
      }

      if (state.tokens.next.id === "(end)" || state.tokens.next.id === "(error)") {
        return;
      }

      if (state.tokens.next.check) {
        state.tokens.next.check();
      }

      if (state.tokens.next.isSpecial) {
        if (state.tokens.next.type === "falls through") {
          state.tokens.curr.caseFallsThrough = true;
        } else {
          doOption();
        }
      } else {
        if (state.tokens.next.id !== "(endline)") {
          break;
        }
      }
    }
  }

  function isInfix(token) {
    return token.infix || (!token.identifier && !token.template && !!token.led);
  }

  function isEndOfExpr() {
    var curr = state.tokens.curr;
    var next = state.tokens.next;
    if (next.id === ";" || next.id === "}" || next.id === ":") {
      return true;
    }
    if (isInfix(next) === isInfix(curr) || (curr.id === "yield" && state.inMoz())) {
      return curr.line !== startLine(next);
    }
    return false;
  }

  function isBeginOfExpr(prev) {
    return !prev.left && prev.arity !== "unary";
  }

  // This is the heart of JSHINT, the Pratt parser. In addition to parsing, it
  // is looking for ad hoc lint patterns. We add .fud to Pratt's model, which is
  // like .nud except that it is only used on the first token of a statement.
  // Having .fud makes it much easier to define statement-oriented languages like
  // JavaScript. I retained Pratt's nomenclature.

  // .nud  Null denotation
  // .fud  First null denotation
  // .led  Left denotation
  //  lbp  Left binding power
  //  rbp  Right binding power

  // They are elements of the parsing method called Top Down Operator Precedence.

  function expression(rbp, initial) {
    var left, isArray = false, isObject = false, isLetExpr = false;

    state.nameStack.push();

    // if current expression is a let expression
    if (!initial && state.tokens.next.value === "let" && peek(0).value === "(") {
      if (!state.inMoz()) {
        warning("W118", state.tokens.next, "let expressions");
      }
      isLetExpr = true;
      // create a new block scope we use only for the current expression
      state.funct["(scope)"].stack();
      advance("let");
      advance("(");
      state.tokens.prev.fud();
      advance(")");
    }

    if (state.tokens.next.id === "(end)")
      error("E006", state.tokens.curr);

    var isDangerous =
      state.option.asi &&
      state.tokens.prev.line !== startLine(state.tokens.curr) &&
      _.contains(["]", ")"], state.tokens.prev.id) &&
      _.contains(["[", "("], state.tokens.curr.id);

    if (isDangerous)
      warning("W014", state.tokens.curr, state.tokens.curr.id);

    advance();

    if (initial) {
      state.funct["(verb)"] = state.tokens.curr.value;
      state.tokens.curr.beginsStmt = true;
    }

    if (initial === true && state.tokens.curr.fud) {
      left = state.tokens.curr.fud();
    } else {
      if (state.tokens.curr.nud) {
        left = state.tokens.curr.nud();
      } else {
        error("E030", state.tokens.curr, state.tokens.curr.id);
      }

      while (rbp < state.tokens.next.lbp && !isEndOfExpr()) {
        isArray = state.tokens.curr.value === "Array";
        isObject = state.tokens.curr.value === "Object";

        // #527, new Foo.Array(), Foo.Array(), new Foo.Object(), Foo.Object()
        // Line breaks in IfStatement heads exist to satisfy the checkJSHint
        // "Line too long." error.
        if (left && (left.value || (left.first && left.first.value))) {
          // If the left.value is not "new", or the left.first.value is a "."
          // then safely assume that this is not "new Array()" and possibly
          // not "new Object()"...
          if (left.value !== "new" ||
            (left.first && left.first.value && left.first.value === ".")) {
            isArray = false;
            // ...In the case of Object, if the left.value and state.tokens.curr.value
            // are not equal, then safely assume that this not "new Object()"
            if (left.value !== state.tokens.curr.value) {
              isObject = false;
            }
          }
        }

        advance();

        if (isArray && state.tokens.curr.id === "(" && state.tokens.next.id === ")") {
          warning("W009", state.tokens.curr);
        }

        if (isObject && state.tokens.curr.id === "(" && state.tokens.next.id === ")") {
          warning("W010", state.tokens.curr);
        }

        if (left && state.tokens.curr.led) {
          left = state.tokens.curr.led(left);
        } else {
          error("E033", state.tokens.curr, state.tokens.curr.id);
        }
      }
    }
    if (isLetExpr) {
      state.funct["(scope)"].unstack();
    }

    state.nameStack.pop();

    return left;
  }


  // Functions for conformance of style.

  function startLine(token) {
    return token.startLine || token.line;
  }

  function nobreaknonadjacent(left, right) {
    left = left || state.tokens.curr;
    right = right || state.tokens.next;
    if (!state.option.laxbreak && left.line !== startLine(right)) {
      warning("W014", right, right.value);
    }
  }

  function nolinebreak(t) {
    t = t || state.tokens.curr;
    if (t.line !== startLine(state.tokens.next)) {
      warning("E022", t, t.value);
    }
  }

  function nobreakcomma(left, right) {
    if (left.line !== startLine(right)) {
      if (!state.option.laxcomma) {
        if (parseComma.first) {
          warning("I001");
          parseComma.first = false;
        }
        warning("W014", left, right.value);
      }
    }
  }

  function parseComma(opts) {
    opts = opts || {};

    if (!opts.peek) {
      nobreakcomma(state.tokens.curr, state.tokens.next);
      advance(",");
    } else {
      nobreakcomma(state.tokens.prev, state.tokens.curr);
    }

    if (state.tokens.next.identifier && !(opts.property && state.inES5())) {
      // Keywords that cannot follow a comma operator.
      switch (state.tokens.next.value) {
      case "break":
      case "case":
      case "catch":
      case "continue":
      case "default":
      case "do":
      case "else":
      case "finally":
      case "for":
      case "if":
      case "in":
      case "instanceof":
      case "return":
      case "switch":
      case "throw":
      case "try":
      case "var":
      case "let":
      case "while":
      case "with":
        error("E024", state.tokens.next, state.tokens.next.value);
        return false;
      }
    }

    if (state.tokens.next.type === "(punctuator)") {
      switch (state.tokens.next.value) {
      case "}":
      case "]":
      case ",":
        if (opts.allowTrailing) {
          return true;
        }

        /* falls through */
      case ")":
        error("E024", state.tokens.next, state.tokens.next.value);
        return false;
      }
    }
    return true;
  }

  // Functional constructors for making the symbols that will be inherited by
  // tokens.

  function symbol(s, p) {
    var x = state.syntax[s];
    if (!x || typeof x !== "object") {
      state.syntax[s] = x = {
        id: s,
        lbp: p,
        value: s
      };
    }
    return x;
  }

  function delim(s) {
    var x = symbol(s, 0);
    x.delim = true;
    return x;
  }

  function stmt(s, f) {
    var x = delim(s);
    x.identifier = x.reserved = true;
    x.fud = f;
    return x;
  }

  function blockstmt(s, f) {
    var x = stmt(s, f);
    x.block = true;
    return x;
  }

  function reserveName(x) {
    var c = x.id.charAt(0);
    if ((c >= "a" && c <= "z") || (c >= "A" && c <= "Z")) {
      x.identifier = x.reserved = true;
    }
    return x;
  }

  function prefix(s, f) {
    var x = symbol(s, 150);
    reserveName(x);

    x.nud = (typeof f === "function") ? f : function() {
      this.arity = "unary";
      this.right = expression(150);

      if (this.id === "++" || this.id === "--") {
        if (state.option.plusplus) {
          warning("W016", this, this.id);
        } else if (this.right && (!this.right.identifier || isReserved(this.right)) &&
            this.right.id !== "." && this.right.id !== "[") {
          warning("W017", this);
        }

        if (this.right && this.right.isMetaProperty) {
          error("E031", this);
        // detect increment/decrement of a const
        // in the case of a.b, right will be the "." punctuator
        } else if (this.right && this.right.identifier) {
          state.funct["(scope)"].block.modify(this.right.value, this);
        }
      }

      return this;
    };

    return x;
  }

  function type(s, f) {
    var x = delim(s);
    x.type = s;
    x.nud = f;
    return x;
  }

  function reserve(name, func) {
    var x = type(name, func);
    x.identifier = true;
    x.reserved = true;
    return x;
  }

  function FutureReservedWord(name, meta) {
    var x = type(name, (meta && meta.nud) || function() {
      return this;
    });

    meta = meta || {};
    meta.isFutureReservedWord = true;

    x.value = name;
    x.identifier = true;
    x.reserved = true;
    x.meta = meta;

    return x;
  }

  function reservevar(s, v) {
    return reserve(s, function() {
      if (typeof v === "function") {
        v(this);
      }
      return this;
    });
  }

  function infix(s, f, p, w) {
    var x = symbol(s, p);
    reserveName(x);
    x.infix = true;
    x.led = function(left) {
      if (!w) {
        nobreaknonadjacent(state.tokens.prev, state.tokens.curr);
      }
      if ((s === "in" || s === "instanceof") && left.id === "!") {
        warning("W018", left, "!");
      }
      if (typeof f === "function") {
        return f(left, this);
      } else {
        this.left = left;
        this.right = expression(p);
        return this;
      }
    };
    return x;
  }

  function application(s) {
    var x = symbol(s, 42);

    x.led = function(left) {
      nobreaknonadjacent(state.tokens.prev, state.tokens.curr);

      this.left = left;
      this.right = doFunction({ type: "arrow", loneArg: left });
      return this;
    };
    return x;
  }

  function relation(s, f) {
    var x = symbol(s, 100);

    x.led = function(left) {
      nobreaknonadjacent(state.tokens.prev, state.tokens.curr);
      this.left = left;
      var right = this.right = expression(100);

      if (isIdentifier(left, "NaN") || isIdentifier(right, "NaN")) {
        warning("W019", this);
      } else if (f) {
        f.apply(this, [left, right]);
      }

      if (!left || !right) {
        quit("E041", state.tokens.curr);
      }

      if (left.id === "!") {
        warning("W018", left, "!");
      }

      if (right.id === "!") {
        warning("W018", right, "!");
      }

      return this;
    };
    return x;
  }

  function isPoorRelation(node) {
    return node &&
        ((node.type === "(number)" && +node.value === 0) ||
         (node.type === "(string)" && node.value === "") ||
         (node.type === "null" && !state.option.eqnull) ||
        node.type === "true" ||
        node.type === "false" ||
        node.type === "undefined");
  }

  var typeofValues = {};
  typeofValues.legacy = [
    // E4X extended the `typeof` operator to return "xml" for the XML and
    // XMLList types it introduced.
    // Ref: 11.3.2 The typeof Operator
    // http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-357.pdf
    "xml",
    // IE<9 reports "unknown" when the `typeof` operator is applied to an
    // object existing across a COM+ bridge. In lieu of official documentation
    // (which does not exist), see:
    // http://robertnyman.com/2005/12/21/what-is-typeof-unknown/
    "unknown"
  ];
  typeofValues.es3 = [
    "undefined", "boolean", "number", "string", "function", "object",
  ];
  typeofValues.es3 = typeofValues.es3.concat(typeofValues.legacy);
  typeofValues.es6 = typeofValues.es3.concat("symbol");

  // Checks whether the 'typeof' operator is used with the correct
  // value. For docs on 'typeof' see:
  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof
  function isTypoTypeof(left, right, state) {
    var values;

    if (state.option.notypeof)
      return false;

    if (!left || !right)
      return false;

    values = state.inES6() ? typeofValues.es6 : typeofValues.es3;

    if (right.type === "(identifier)" && right.value === "typeof" && left.type === "(string)")
      return !_.contains(values, left.value);

    return false;
  }

  function isGlobalEval(left, state) {
    var isGlobal = false;

    // permit methods to refer to an "eval" key in their own context
    if (left.type === "this" && state.funct["(context)"] === null) {
      isGlobal = true;
    }
    // permit use of "eval" members of objects
    else if (left.type === "(identifier)") {
      if (state.option.node && left.value === "global") {
        isGlobal = true;
      }

      else if (state.option.browser && (left.value === "window" || left.value === "document")) {
        isGlobal = true;
      }
    }

    return isGlobal;
  }

  function findNativePrototype(left) {
    var natives = [
      "Array", "ArrayBuffer", "Boolean", "Collator", "DataView", "Date",
      "DateTimeFormat", "Error", "EvalError", "Float32Array", "Float64Array",
      "Function", "Infinity", "Intl", "Int16Array", "Int32Array", "Int8Array",
      "Iterator", "Number", "NumberFormat", "Object", "RangeError",
      "ReferenceError", "RegExp", "StopIteration", "String", "SyntaxError",
      "TypeError", "Uint16Array", "Uint32Array", "Uint8Array", "Uint8ClampedArray",
      "URIError"
    ];

    function walkPrototype(obj) {
      if (typeof obj !== "object") return;
      return obj.right === "prototype" ? obj : walkPrototype(obj.left);
    }

    function walkNative(obj) {
      while (!obj.identifier && typeof obj.left === "object")
        obj = obj.left;

      if (obj.identifier && natives.indexOf(obj.value) >= 0 &&
          state.funct["(scope)"].isPredefined(obj.value)) {
        return obj.value;
      }
    }

    var prototype = walkPrototype(left);
    if (prototype) return walkNative(prototype);
  }

  /**
   * Checks the left hand side of an assignment for issues, returns if ok
   * @param {token} left - the left hand side of the assignment
   * @param {token=} assignToken - the token for the assignment, used for reporting
   * @param {object=} options - optional object
   * @param {boolean} options.allowDestructuring - whether to allow destructuting binding
   * @returns {boolean} Whether the left hand side is OK
   */
  function checkLeftSideAssign(left, assignToken, options) {

    var allowDestructuring = options && options.allowDestructuring;

    assignToken = assignToken || left;

    if (state.option.freeze) {
      var nativeObject = findNativePrototype(left);
      if (nativeObject)
        warning("W121", left, nativeObject);
    }
    if (checkPunctuator(left, "...")) {
      left = left.right;
    }

    if (left.identifier && !left.isMetaProperty) {
      // reassign also calls modify
      // but we are specific in order to catch function re-assignment
      // and globals re-assignment
      state.funct["(scope)"].block.reassign(left.value, left);
    }

    if (left.id === ".") {
      if (!left.left || left.left.value === "arguments" && !state.isStrict()) {
        warning("E031", assignToken);
      }

      state.nameStack.set(state.tokens.prev);
      return true;
    } else if (left.id === "{" || left.id === "[") {
      if (allowDestructuring && left.destructAssign) {
        left.destructAssign.forEach(function(t) {
          if (t.id) {
            state.funct["(scope)"].block.modify(t.id, t.token);
          }
        });
      } else {
        if (left.id === "{" || !left.left) {
          warning("E031", assignToken);
        } else if (left.left.value === "arguments" && !state.isStrict()) {
          warning("E031", assignToken);
        }
      }

      if (left.id === "[") {
        state.nameStack.set(left.right);
      }

      return true;
    } else if (left.identifier && !isReserved(left) && !left.isMetaProperty) {
      if (state.funct["(scope)"].labeltype(left.value) === "exception") {
        warning("W022", left);
      }
      state.nameStack.set(left);
      return true;
    }

    if (left === state.syntax["function"]) {
      warning("W023", state.tokens.curr);
    } else {
      error("E031", assignToken);
    }

    return false;
  }

  function assignop(s, f, p) {
    var x = infix(s, typeof f === "function" ? f : function(left, that) {
      that.left = left;

      checkLeftSideAssign(left, that, { allowDestructuring: true });

      that.right = expression(10);

      return that;
    }, p);

    x.exps = true;
    x.assign = true;
    return x;
  }


  function bitwise(s, f, p) {
    var x = symbol(s, p);
    reserveName(x);
    x.led = (typeof f === "function") ? f : function(left) {
      if (state.option.bitwise) {
        warning("W016", this, this.id);
      }
      this.left = left;
      this.right = expression(p);
      return this;
    };
    return x;
  }

  function bitwiseassignop(s) {
    return assignop(s, function(left, that) {
      if (state.option.bitwise) {
        warning("W016", that, that.id);
      }

      checkLeftSideAssign(left, that);

      that.right = expression(10);

      return that;
    }, 20);
  }

  function suffix(s) {
    var x = symbol(s, 150);

    x.led = function(left) {
      // this = suffix e.g. "++" punctuator
      // left = symbol operated e.g. "a" identifier or "a.b" punctuator
      if (state.option.plusplus) {
        warning("W016", this, this.id);
      } else if ((!left.identifier || isReserved(left)) && left.id !== "." && left.id !== "[") {
        warning("W017", this);
      }

      if (left.isMetaProperty) {
        error("E031", this);
      // detect increment/decrement of a const
      // in the case of a.b, left will be the "." punctuator
      } else if (left && left.identifier) {
        state.funct["(scope)"].block.modify(left.value, left);
      }

      this.left = left;
      return this;
    };
    return x;
  }

  // fnparam means that this identifier is being defined as a function
  // argument (see identifier())
  // prop means that this identifier is that of an object property

  function optionalidentifier(fnparam, prop, preserve) {
    if (!state.tokens.next.identifier) {
      return;
    }

    if (!preserve) {
      advance();
    }

    var curr = state.tokens.curr;
    var val  = state.tokens.curr.value;

    if (!isReserved(curr)) {
      return val;
    }

    if (prop) {
      if (state.inES5()) {
        return val;
      }
    }

    if (fnparam && val === "undefined") {
      return val;
    }

    warning("W024", state.tokens.curr, state.tokens.curr.id);
    return val;
  }

  // fnparam means that this identifier is being defined as a function
  // argument
  // prop means that this identifier is that of an object property
  function identifier(fnparam, prop) {
    var i = optionalidentifier(fnparam, prop, false);
    if (i) {
      return i;
    }

    // parameter destructuring with rest operator
    if (state.tokens.next.value === "...") {
      if (!state.inES6(true)) {
        warning("W119", state.tokens.next, "spread/rest operator", "6");
      }
      advance();

      if (checkPunctuator(state.tokens.next, "...")) {
        warning("E024", state.tokens.next, "...");
        while (checkPunctuator(state.tokens.next, "...")) {
          advance();
        }
      }

      if (!state.tokens.next.identifier) {
        warning("E024", state.tokens.curr, "...");
        return;
      }

      return identifier(fnparam, prop);
    } else {
      error("E030", state.tokens.next, state.tokens.next.value);

      // The token should be consumed after a warning is issued so the parser
      // can continue as though an identifier were found. The semicolon token
      // should not be consumed in this way so that the parser interprets it as
      // a statement delimeter;
      if (state.tokens.next.id !== ";") {
        advance();
      }
    }
  }


  function reachable(controlToken) {
    var i = 0, t;
    if (state.tokens.next.id !== ";" || controlToken.inBracelessBlock) {
      return;
    }
    for (;;) {
      do {
        t = peek(i);
        i += 1;
      } while (t.id !== "(end)" && t.id === "(comment)");

      if (t.reach) {
        return;
      }
      if (t.id !== "(endline)") {
        if (t.id === "function") {
          if (state.option.latedef === true) {
            warning("W026", t);
          }
          break;
        }

        warning("W027", t, t.value, controlToken.value);
        break;
      }
    }
  }

  function parseFinalSemicolon() {
    if (state.tokens.next.id !== ";") {
      // don't complain about unclosed templates / strings
      if (state.tokens.next.isUnclosed) return advance();

      var sameLine = startLine(state.tokens.next) === state.tokens.curr.line &&
                     state.tokens.next.id !== "(end)";
      var blockEnd = checkPunctuator(state.tokens.next, "}");

      if (sameLine && !blockEnd) {
        errorAt("E058", state.tokens.curr.line, state.tokens.curr.character);
      } else if (!state.option.asi) {
        // If this is the last statement in a block that ends on
        // the same line *and* option lastsemic is on, ignore the warning.
        // Otherwise, complain about missing semicolon.
        if ((blockEnd && !state.option.lastsemic) || !sameLine) {
          warningAt("W033", state.tokens.curr.line, state.tokens.curr.character);
        }
      }
    } else {
      advance(";");
    }
  }

  function statement() {
    var i = indent, r, t = state.tokens.next, hasOwnScope = false;

    if (t.id === ";") {
      advance(";");
      return;
    }

    // Is this a labelled statement?
    var res = isReserved(t);

    // We're being more tolerant here: if someone uses
    // a FutureReservedWord as a label, we warn but proceed
    // anyway.

    if (res && t.meta && t.meta.isFutureReservedWord && peek().id === ":") {
      warning("W024", t, t.id);
      res = false;
    }

    if (t.identifier && !res && peek().id === ":") {
      advance();
      advance(":");

      hasOwnScope = true;
      state.funct["(scope)"].stack();
      state.funct["(scope)"].block.addBreakLabel(t.value, { token: state.tokens.curr });

      if (!state.tokens.next.labelled && state.tokens.next.value !== "{") {
        warning("W028", state.tokens.next, t.value, state.tokens.next.value);
      }

      state.tokens.next.label = t.value;
      t = state.tokens.next;
    }

    // Is it a lonely block?

    if (t.id === "{") {
      // Is it a switch case block?
      //
      //  switch (foo) {
      //    case bar: { <= here.
      //      ...
      //    }
      //  }
      var iscase = (state.funct["(verb)"] === "case" && state.tokens.curr.value === ":");
      block(true, true, false, false, iscase);
      return;
    }

    // Parse the statement.

    r = expression(0, true);

    if (r && !(r.identifier && r.value === "function") &&
        !(r.type === "(punctuator)" && r.left &&
          r.left.identifier && r.left.value === "function")) {
      if (!state.isStrict() && state.stmtMissingStrict()) {
        warning("E007");
      }
    }

    // Look for the final semicolon.

    if (!t.block) {
      if (!state.option.expr && (!r || !r.exps)) {
        warning("W030", state.tokens.curr);
      } else if (state.option.nonew && r && r.left && r.id === "(" && r.left.id === "new") {
        warning("W031", t);
      }
      parseFinalSemicolon();
    }


    // Restore the indentation.

    indent = i;
    if (hasOwnScope) {
      state.funct["(scope)"].unstack();
    }
    return r;
  }


  function statements() {
    var a = [], p;

    while (!state.tokens.next.reach && state.tokens.next.id !== "(end)") {
      if (state.tokens.next.id === ";") {
        p = peek();

        if (!p || (p.id !== "(" && p.id !== "[")) {
          warning("W032");
        }

        advance(";");
      } else {
        a.push(statement());
      }
    }
    return a;
  }


  /*
   * read all directives
   * recognizes a simple form of asi, but always
   * warns, if it is used
   */
  function directives() {
    var i, p, pn;

    while (state.tokens.next.id === "(string)") {
      p = peek(0);
      if (p.id === "(endline)") {
        i = 1;
        do {
          pn = peek(i++);
        } while (pn.id === "(endline)");
        if (pn.id === ";") {
          p = pn;
        } else if (pn.value === "[" || pn.value === ".") {
          // string -> [ | . is a valid production
          break;
        } else if (!state.option.asi || pn.value === "(") {
          // string -> ( is not a valid production
          warning("W033", state.tokens.next);
        }
      } else if (p.id === "." || p.id === "[") {
        break;
      } else if (p.id !== ";") {
        warning("W033", p);
      }

      advance();
      var directive = state.tokens.curr.value;
      if (state.directive[directive] ||
          (directive === "use strict" && state.option.strict === "implied")) {
        warning("W034", state.tokens.curr, directive);
      }

      // there's no directive negation, so always set to true
      state.directive[directive] = true;

      if (p.id === ";") {
        advance(";");
      }
    }

    if (state.isStrict()) {
      state.option.undef = true;
    }
  }


  /*
   * Parses a single block. A block is a sequence of statements wrapped in
   * braces.
   *
   * ordinary   - true for everything but function bodies and try blocks.
   * stmt       - true if block can be a single statement (e.g. in if/for/while).
   * isfunc     - true if block is a function body
   * isfatarrow - true if its a body of a fat arrow function
   * iscase      - true if block is a switch case block
   */
  function block(ordinary, stmt, isfunc, isfatarrow, iscase) {
    var a,
      b = inblock,
      old_indent = indent,
      m,
      t,
      line,
      d;

    inblock = ordinary;

    t = state.tokens.next;

    var metrics = state.funct["(metrics)"];
    metrics.nestedBlockDepth += 1;
    metrics.verifyMaxNestedBlockDepthPerFunction();

    if (state.tokens.next.id === "{") {
      advance("{");

      // create a new block scope
      state.funct["(scope)"].stack();
      state.funct["(noblockscopedvar)"] = false;

      line = state.tokens.curr.line;
      if (state.tokens.next.id !== "}") {
        indent += state.option.indent;
        while (!ordinary && state.tokens.next.from > indent) {
          indent += state.option.indent;
        }

        if (isfunc) {
          m = {};
          for (d in state.directive) {
            if (_.has(state.directive, d)) {
              m[d] = state.directive[d];
            }
          }
          directives();

          if (state.option.strict && state.funct["(context)"]["(global)"]) {
            if (!m["use strict"] && !state.isStrict()) {
              warning("E007");
            }
          }
        }

        a = statements();

        metrics.statementCount += a.length;

        indent -= state.option.indent;
      }

      advance("}", t);

      if (isfunc) {
        state.funct["(scope)"].validateParams();
        if (m) {
          state.directive = m;
        }
      }

      state.funct["(scope)"].unstack();

      indent = old_indent;
    } else if (!ordinary) {
      if (isfunc) {
        state.funct["(scope)"].stack();

        m = {};
        if (stmt && !isfatarrow && !state.inMoz()) {
          error("W118", state.tokens.curr, "function closure expressions");
        }

        if (!stmt) {
          for (d in state.directive) {
            if (_.has(state.directive, d)) {
              m[d] = state.directive[d];
            }
          }
        }
        expression(10);

        if (state.option.strict && state.funct["(context)"]["(global)"]) {
          if (!m["use strict"] && !state.isStrict()) {
            warning("E007");
          }
        }

        state.funct["(scope)"].unstack();
      } else {
        error("E021", state.tokens.next, "{", state.tokens.next.value);
      }
    } else {

      // check to avoid let declaration not within a block
      // though is fine inside for loop initializer section
      state.funct["(noblockscopedvar)"] = state.tokens.next.id !== "for";
      state.funct["(scope)"].stack();

      if (!stmt || state.option.curly) {
        warning("W116", state.tokens.next, "{", state.tokens.next.value);
      }

      state.tokens.next.inBracelessBlock = true;
      indent += state.option.indent;
      // test indentation only if statement is in new line
      a = [statement()];
      indent -= state.option.indent;

      state.funct["(scope)"].unstack();
      delete state.funct["(noblockscopedvar)"];
    }

    // Don't clear and let it propagate out if it is "break", "return" or similar in switch case
    switch (state.funct["(verb)"]) {
    case "break":
    case "continue":
    case "return":
    case "throw":
      if (iscase) {
        break;
      }

      /* falls through */
    default:
      state.funct["(verb)"] = null;
    }

    inblock = b;
    if (ordinary && state.option.noempty && (!a || a.length === 0)) {
      warning("W035", state.tokens.prev);
    }
    metrics.nestedBlockDepth -= 1;
    return a;
  }


  function countMember(m) {
    if (membersOnly && typeof membersOnly[m] !== "boolean") {
      warning("W036", state.tokens.curr, m);
    }
    if (typeof member[m] === "number") {
      member[m] += 1;
    } else {
      member[m] = 1;
    }
  }

  // Build the syntax table by declaring the syntactic elements of the language.

  type("(number)", function() {
    return this;
  });

  type("(string)", function() {
    return this;
  });

  state.syntax["(identifier)"] = {
    type: "(identifier)",
    lbp: 0,
    identifier: true,

    nud: function() {
      var v = this.value;

      // If this identifier is the lone parameter to a shorthand "fat arrow"
      // function definition, i.e.
      //
      //     x => x;
      //
      // ...it should not be considered as a variable in the current scope. It
      // will be added to the scope of the new function when the next token is
      // parsed, so it can be safely ignored for now.
      if (state.tokens.next.id === "=>") {
        return this;
      }

      if (!state.funct["(comparray)"].check(v)) {
        state.funct["(scope)"].block.use(v, state.tokens.curr);
      }
      return this;
    },

    led: function() {
      error("E033", state.tokens.next, state.tokens.next.value);
    }
  };

  var baseTemplateSyntax = {
    identifier: false,
    template: true,
  };
  state.syntax["(template)"] = _.extend({
    lbp: 155,
    type: "(template)",
    nud: doTemplateLiteral,
    led: doTemplateLiteral,
    noSubst: false
  }, baseTemplateSyntax);

  state.syntax["(template middle)"] = _.extend({
    lbp: 0,
    type: "(template middle)",
    middle: true,
    noSubst: false
  }, baseTemplateSyntax);

  state.syntax["(template tail)"] = _.extend({
    lbp: 0,
    type: "(template tail)",
    tail: true,
    noSubst: false
  }, baseTemplateSyntax);

  state.syntax["(no subst template)"] = _.extend({
    lbp: 155,
    type: "(template)",
    nud: doTemplateLiteral,
    led: doTemplateLiteral,
    noSubst: true,
    tail: true // mark as tail, since it's always the last component
  }, baseTemplateSyntax);

  type("(regexp)", function() {
    return this;
  });

  // ECMAScript parser

  delim("(endline)");
  (function(x) {
    x.line = x.from = 0;
  })(delim("(begin)"));
  delim("(end)").reach = true;
  delim("(error)").reach = true;
  delim("}").reach = true;
  delim(")");
  delim("]");
  delim("\"").reach = true;
  delim("'").reach = true;
  delim(";");
  delim(":").reach = true;
  delim("#");

  reserve("else");
  reserve("case").reach = true;
  reserve("catch");
  reserve("default").reach = true;
  reserve("finally");
  reservevar("arguments", function(x) {
    if (state.isStrict() && state.funct["(global)"]) {
      warning("E008", x);
    }
  });
  reservevar("eval");
  reservevar("false");
  reservevar("Infinity");
  reservevar("null");
  reservevar("this", function(x) {
    if (state.isStrict() && !isMethod() &&
        !state.option.validthis && ((state.funct["(statement)"] &&
        state.funct["(name)"].charAt(0) > "Z") || state.funct["(global)"])) {
      warning("W040", x);
    }
  });
  reservevar("true");
  reservevar("undefined");

  assignop("=", "assign", 20);
  assignop("+=", "assignadd", 20);
  assignop("-=", "assignsub", 20);
  assignop("*=", "assignmult", 20);
  assignop("/=", "assigndiv", 20).nud = function() {
    error("E014");
  };
  assignop("%=", "assignmod", 20);

  bitwiseassignop("&=");
  bitwiseassignop("|=");
  bitwiseassignop("^=");
  bitwiseassignop("<<=");
  bitwiseassignop(">>=");
  bitwiseassignop(">>>=");
  infix(",", function(left, that) {
    var expr;
    that.exprs = [left];

    if (state.option.nocomma) {
      warning("W127");
    }

    if (!parseComma({ peek: true })) {
      return that;
    }
    while (true) {
      if (!(expr = expression(10))) {
        break;
      }
      that.exprs.push(expr);
      if (state.tokens.next.value !== "," || !parseComma()) {
        break;
      }
    }
    return that;
  }, 10, true);

  infix("?", function(left, that) {
    increaseComplexityCount();
    that.left = left;
    that.right = expression(10);
    advance(":");
    that["else"] = expression(10);
    return that;
  }, 30);

  var orPrecendence = 40;
  infix("||", function(left, that) {
    increaseComplexityCount();
    that.left = left;
    that.right = expression(orPrecendence);
    return that;
  }, orPrecendence);
  infix("&&", "and", 50);
  bitwise("|", "bitor", 70);
  bitwise("^", "bitxor", 80);
  bitwise("&", "bitand", 90);
  relation("==", function(left, right) {
    var eqnull = state.option.eqnull &&
      ((left && left.value) === "null" || (right && right.value) === "null");

    switch (true) {
      case !eqnull && state.option.eqeqeq:
        this.from = this.character;
        warning("W116", this, "===", "==");
        break;
      case isPoorRelation(left):
        warning("W041", this, "===", left.value);
        break;
      case isPoorRelation(right):
        warning("W041", this, "===", right.value);
        break;
      case isTypoTypeof(right, left, state):
        warning("W122", this, right.value);
        break;
      case isTypoTypeof(left, right, state):
        warning("W122", this, left.value);
        break;
    }

    return this;
  });
  relation("===", function(left, right) {
    if (isTypoTypeof(right, left, state)) {
      warning("W122", this, right.value);
    } else if (isTypoTypeof(left, right, state)) {
      warning("W122", this, left.value);
    }
    return this;
  });
  relation("!=", function(left, right) {
    var eqnull = state.option.eqnull &&
        ((left && left.value) === "null" || (right && right.value) === "null");

    if (!eqnull && state.option.eqeqeq) {
      this.from = this.character;
      warning("W116", this, "!==", "!=");
    } else if (isPoorRelation(left)) {
      warning("W041", this, "!==", left.value);
    } else if (isPoorRelation(right)) {
      warning("W041", this, "!==", right.value);
    } else if (isTypoTypeof(right, left, state)) {
      warning("W122", this, right.value);
    } else if (isTypoTypeof(left, right, state)) {
      warning("W122", this, left.value);
    }
    return this;
  });
  relation("!==", function(left, right) {
    if (isTypoTypeof(right, left, state)) {
      warning("W122", this, right.value);
    } else if (isTypoTypeof(left, right, state)) {
      warning("W122", this, left.value);
    }
    return this;
  });
  relation("<");
  relation(">");
  relation("<=");
  relation(">=");
  bitwise("<<", "shiftleft", 120);
  bitwise(">>", "shiftright", 120);
  bitwise(">>>", "shiftrightunsigned", 120);
  infix("in", "in", 120);
  infix("instanceof", "instanceof", 120);
  infix("+", function(left, that) {
    var right;
    that.left = left;
    that.right = right = expression(130);

    if (left && right && left.id === "(string)" && right.id === "(string)") {
      left.value += right.value;
      left.character = right.character;
      if (!state.option.scripturl && reg.javascriptURL.test(left.value)) {
        warning("W050", left);
      }
      return left;
    }

    return that;
  }, 130);
  prefix("+", "num");
  prefix("+++", function() {
    warning("W007");
    this.arity = "unary";
    this.right = expression(150);
    return this;
  });
  infix("+++", function(left) {
    warning("W007");
    this.left = left;
    this.right = expression(130);
    return this;
  }, 130);
  infix("-", "sub", 130);
  prefix("-", "neg");
  prefix("---", function() {
    warning("W006");
    this.arity = "unary";
    this.right = expression(150);
    return this;
  });
  infix("---", function(left) {
    warning("W006");
    this.left = left;
    this.right = expression(130);
    return this;
  }, 130);
  infix("*", "mult", 140);
  infix("/", "div", 140);
  infix("%", "mod", 140);

  suffix("++");
  prefix("++", "preinc");
  state.syntax["++"].exps = true;

  suffix("--");
  prefix("--", "predec");
  state.syntax["--"].exps = true;
  prefix("delete", function() {
    var p = expression(10);
    if (!p) {
      return this;
    }

    if (p.id !== "." && p.id !== "[") {
      warning("W051");
    }
    this.first = p;

    // The `delete` operator accepts unresolvable references when not in strict
    // mode, so the operand may be undefined.
    if (p.identifier && !state.isStrict()) {
      p.forgiveUndef = true;
    }
    return this;
  }).exps = true;

  prefix("~", function() {
    if (state.option.bitwise) {
      warning("W016", this, "~");
    }
    this.arity = "unary";
    this.right = expression(150);
    return this;
  });

  prefix("...", function() {
    if (!state.inES6(true)) {
      warning("W119", this, "spread/rest operator", "6");
    }

    // TODO: Allow all AssignmentExpression
    // once parsing permits.
    //
    // How to handle eg. number, boolean when the built-in
    // prototype of may have an @@iterator definition?
    //
    // Number.prototype[Symbol.iterator] = function * () {
    //   yield this.valueOf();
    // };
    //
    // var a = [ ...1 ];
    // console.log(a); // [1];
    //
    // for (let n of [...10]) {
    //    console.log(n);
    // }
    // // 10
    //
    //
    // Boolean.prototype[Symbol.iterator] = function * () {
    //   yield this.valueOf();
    // };
    //
    // var a = [ ...true ];
    // console.log(a); // [true];
    //
    // for (let n of [...false]) {
    //    console.log(n);
    // }
    // // false
    //
    if (!state.tokens.next.identifier &&
        state.tokens.next.type !== "(string)" &&
          !checkPunctuators(state.tokens.next, ["[", "("])) {

      error("E030", state.tokens.next, state.tokens.next.value);
    }
    this.right = expression(150);
    return this;
  });

  prefix("!", function() {
    this.arity = "unary";
    this.right = expression(150);

    if (!this.right) { // '!' followed by nothing? Give up.
      quit("E041", this);
    }

    if (bang[this.right.id] === true) {
      warning("W018", this, "!");
    }
    return this;
  });

  prefix("typeof", (function() {
    var p = expression(150);
    this.first = this.right = p;

    if (!p) { // 'typeof' followed by nothing? Give up.
      quit("E041", this);
    }

    // The `typeof` operator accepts unresolvable references, so the operand
    // may be undefined.
    if (p.identifier) {
      p.forgiveUndef = true;
    }
    return this;
  }));
  prefix("new", function() {
    var mp = metaProperty("target", function() {
      if (!state.inES6(true)) {
        warning("W119", state.tokens.prev, "new.target", "6");
      }
      var inFunction, c = state.funct;
      while (c) {
        inFunction = !c["(global)"];
        if (!c["(arrow)"]) { break; }
        c = c["(context)"];
      }
      if (!inFunction) {
        warning("W136", state.tokens.prev, "new.target");
      }
    });
    if (mp) { return mp; }

    var c = expression(155), i;
    if (c && c.id !== "function") {
      if (c.identifier) {
        c["new"] = true;
        switch (c.value) {
        case "Number":
        case "String":
        case "Boolean":
        case "Math":
        case "JSON":
          warning("W053", state.tokens.prev, c.value);
          break;
        case "Symbol":
          if (state.inES6()) {
            warning("W053", state.tokens.prev, c.value);
          }
          break;
        case "Function":
          if (!state.option.evil) {
            warning("W054");
          }
          break;
        case "Date":
        case "RegExp":
        case "this":
          break;
        default:
          if (c.id !== "function") {
            i = c.value.substr(0, 1);
            if (state.option.newcap && (i < "A" || i > "Z") &&
              !state.funct["(scope)"].isPredefined(c.value)) {
              warning("W055", state.tokens.curr);
            }
          }
        }
      } else {
        if (c.id !== "." && c.id !== "[" && c.id !== "(") {
          warning("W056", state.tokens.curr);
        }
      }
    } else {
      if (!state.option.supernew)
        warning("W057", this);
    }
    if (state.tokens.next.id !== "(" && !state.option.supernew) {
      warning("W058", state.tokens.curr, state.tokens.curr.value);
    }
    this.first = this.right = c;
    return this;
  });
  state.syntax["new"].exps = true;

  prefix("void").exps = true;

  infix(".", function(left, that) {
    var m = identifier(false, true);

    if (typeof m === "string") {
      countMember(m);
    }

    that.left = left;
    that.right = m;

    if (m && m === "hasOwnProperty" && state.tokens.next.value === "=") {
      warning("W001");
    }

    if (left && left.value === "arguments" && (m === "callee" || m === "caller")) {
      if (state.option.noarg)
        warning("W059", left, m);
      else if (state.isStrict())
        error("E008");
    } else if (!state.option.evil && left && left.value === "document" &&
        (m === "write" || m === "writeln")) {
      warning("W060", left);
    }

    if (!state.option.evil && (m === "eval" || m === "execScript")) {
      if (isGlobalEval(left, state)) {
        warning("W061");
      }
    }

    return that;
  }, 160, true);

  infix("(", function(left, that) {
    if (state.option.immed && left && !left.immed && left.id === "function") {
      warning("W062");
    }

    var n = 0;
    var p = [];

    if (left) {
      if (left.type === "(identifier)") {
        if (left.value.match(/^[A-Z]([A-Z0-9_$]*[a-z][A-Za-z0-9_$]*)?$/)) {
          if ("Array Number String Boolean Date Object Error Symbol".indexOf(left.value) === -1) {
            if (left.value === "Math") {
              warning("W063", left);
            } else if (state.option.newcap) {
              warning("W064", left);
            }
          }
        }
      }
    }

    if (state.tokens.next.id !== ")") {
      for (;;) {
        p[p.length] = expression(10);
        n += 1;
        if (state.tokens.next.id !== ",") {
          break;
        }
        parseComma();
      }
    }

    advance(")");

    if (typeof left === "object") {
      if (!state.inES5() && left.value === "parseInt" && n === 1) {
        warning("W065", state.tokens.curr);
      }
      if (!state.option.evil) {
        if (left.value === "eval" || left.value === "Function" ||
            left.value === "execScript") {
          warning("W061", left);

          if (p[0] && [0].id === "(string)") {
            addInternalSrc(left, p[0].value);
          }
        } else if (p[0] && p[0].id === "(string)" &&
             (left.value === "setTimeout" ||
            left.value === "setInterval")) {
          warning("W066", left);
          addInternalSrc(left, p[0].value);

        // window.setTimeout/setInterval
        } else if (p[0] && p[0].id === "(string)" &&
             left.value === "." &&
             left.left.value === "window" &&
             (left.right === "setTimeout" ||
            left.right === "setInterval")) {
          warning("W066", left);
          addInternalSrc(left, p[0].value);
        }
      }
      if (!left.identifier && left.id !== "." && left.id !== "[" && left.id !== "=>" &&
          left.id !== "(" && left.id !== "&&" && left.id !== "||" && left.id !== "?" &&
          !(state.inES6() && left["(name)"])) {
        warning("W067", that);
      }
    }

    that.left = left;
    return that;
  }, 155, true).exps = true;

  prefix("(", function() {
    var pn = state.tokens.next, pn1, i = -1;
    var ret, triggerFnExpr, first, last;
    var parens = 1;
    var opening = state.tokens.curr;
    var preceeding = state.tokens.prev;
    var isNecessary = !state.option.singleGroups;

    do {
      if (pn.value === "(") {
        parens += 1;
      } else if (pn.value === ")") {
        parens -= 1;
      }

      i += 1;
      pn1 = pn;
      pn = peek(i);
    } while (!(parens === 0 && pn1.value === ")") && pn.value !== ";" && pn.type !== "(end)");

    if (state.tokens.next.id === "function") {
      triggerFnExpr = state.tokens.next.immed = true;
    }

    // If the balanced grouping operator is followed by a "fat arrow", the
    // current token marks the beginning of a "fat arrow" function and parsing
    // should proceed accordingly.
    if (pn.value === "=>") {
      return doFunction({ type: "arrow", parsedOpening: true });
    }

    var exprs = [];

    if (state.tokens.next.id !== ")") {
      for (;;) {
        exprs.push(expression(10));

        if (state.tokens.next.id !== ",") {
          break;
        }

        if (state.option.nocomma) {
          warning("W127");
        }

        parseComma();
      }
    }

    advance(")", this);
    if (state.option.immed && exprs[0] && exprs[0].id === "function") {
      if (state.tokens.next.id !== "(" &&
        state.tokens.next.id !== "." && state.tokens.next.id !== "[") {
        warning("W068", this);
      }
    }

    if (!exprs.length) {
      return;
    }
    if (exprs.length > 1) {
      ret = Object.create(state.syntax[","]);
      ret.exprs = exprs;

      first = exprs[0];
      last = exprs[exprs.length - 1];

      if (!isNecessary) {
        isNecessary = preceeding.assign || preceeding.delim;
      }
    } else {
      ret = first = last = exprs[0];

      if (!isNecessary) {
        isNecessary =
          // Used to distinguish from an ExpressionStatement which may not
          // begin with the `{` and `function` tokens
          (opening.beginsStmt && (ret.id === "{" || triggerFnExpr || isFunctor(ret))) ||
          // Used to signal that a function expression is being supplied to
          // some other operator.
          (triggerFnExpr &&
            // For parenthesis wrapping a function expression to be considered
            // necessary, the grouping operator should be the left-hand-side of
            // some other operator--either within the parenthesis or directly
            // following them.
            (!isEndOfExpr() || state.tokens.prev.id !== "}")) ||
          // Used to demarcate an arrow function as the left-hand side of some
          // operator.
          (isFunctor(ret) && !isEndOfExpr()) ||
          // Used as the return value of a single-statement arrow function
          (ret.id === "{" && preceeding.id === "=>") ||
          // Used to delineate an integer number literal from a dereferencing
          // punctuator (otherwise interpreted as a decimal point)
          (ret.type === "(number)" &&
            checkPunctuator(pn, ".") && /^\d+$/.test(ret.value)) ||
          // Used to wrap object destructuring assignment
          (opening.beginsStmt && ret.id === "=" && ret.left.id === "{");
      }
    }

    if (ret) {
      // The operator may be necessary to override the default binding power of
      // neighboring operators (whenever there is an operator in use within the
      // first expression *or* the current group contains multiple expressions)
      if (!isNecessary && (first.left || first.right || ret.exprs)) {
        isNecessary =
          (!isBeginOfExpr(preceeding) && first.lbp <= preceeding.lbp) ||
          (!isEndOfExpr() && last.lbp < state.tokens.next.lbp);
      }

      if (!isNecessary) {
        warning("W126", opening);
      }

      ret.paren = true;
    }

    return ret;
  });

  application("=>");

  infix("[", function(left, that) {
    var e = expression(10), s;
    if (e && e.type === "(string)") {
      if (!state.option.evil && (e.value === "eval" || e.value === "execScript")) {
        if (isGlobalEval(left, state)) {
          warning("W061");
        }
      }

      countMember(e.value);
      if (!state.option.sub && reg.identifier.test(e.value)) {
        s = state.syntax[e.value];
        if (!s || !isReserved(s)) {
          warning("W069", state.tokens.prev, e.value);
        }
      }
    }
    advance("]", that);

    if (e && e.value === "hasOwnProperty" && state.tokens.next.value === "=") {
      warning("W001");
    }

    that.left = left;
    that.right = e;
    return that;
  }, 160, true);

  function comprehensiveArrayExpression() {
    var res = {};
    res.exps = true;
    state.funct["(comparray)"].stack();

    // Handle reversed for expressions, used in spidermonkey
    var reversed = false;
    if (state.tokens.next.value !== "for") {
      reversed = true;
      if (!state.inMoz()) {
        warning("W116", state.tokens.next, "for", state.tokens.next.value);
      }
      state.funct["(comparray)"].setState("use");
      res.right = expression(10);
    }

    advance("for");
    if (state.tokens.next.value === "each") {
      advance("each");
      if (!state.inMoz()) {
        warning("W118", state.tokens.curr, "for each");
      }
    }
    advance("(");
    state.funct["(comparray)"].setState("define");
    res.left = expression(130);
    if (_.contains(["in", "of"], state.tokens.next.value)) {
      advance();
    } else {
      error("E045", state.tokens.curr);
    }
    state.funct["(comparray)"].setState("generate");
    expression(10);

    advance(")");
    if (state.tokens.next.value === "if") {
      advance("if");
      advance("(");
      state.funct["(comparray)"].setState("filter");
      res.filter = expression(10);
      advance(")");
    }

    if (!reversed) {
      state.funct["(comparray)"].setState("use");
      res.right = expression(10);
    }

    advance("]");
    state.funct["(comparray)"].unstack();
    return res;
  }

  prefix("[", function() {
    var blocktype = lookupBlockType();
    if (blocktype.isCompArray) {
      if (!state.option.esnext && !state.inMoz()) {
        warning("W118", state.tokens.curr, "array comprehension");
      }
      return comprehensiveArrayExpression();
    } else if (blocktype.isDestAssign) {
      this.destructAssign = destructuringPattern({ openingParsed: true, assignment: true });
      return this;
    }
    var b = state.tokens.curr.line !== startLine(state.tokens.next);
    this.first = [];
    if (b) {
      indent += state.option.indent;
      if (state.tokens.next.from === indent + state.option.indent) {
        indent += state.option.indent;
      }
    }
    while (state.tokens.next.id !== "(end)") {
      while (state.tokens.next.id === ",") {
        if (!state.option.elision) {
          if (!state.inES5()) {
            // Maintain compat with old options --- ES5 mode without
            // elision=true will warn once per comma
            warning("W070");
          } else {
            warning("W128");
            do {
              advance(",");
            } while (state.tokens.next.id === ",");
            continue;
          }
        }
        advance(",");
      }

      if (state.tokens.next.id === "]") {
        break;
      }

      this.first.push(expression(10));
      if (state.tokens.next.id === ",") {
        parseComma({ allowTrailing: true });
        if (state.tokens.next.id === "]" && !state.inES5()) {
          warning("W070", state.tokens.curr);
          break;
        }
      } else {
        break;
      }
    }
    if (b) {
      indent -= state.option.indent;
    }
    advance("]", this);
    return this;
  });


  function isMethod() {
    return state.funct["(statement)"] && state.funct["(statement)"].type === "class" ||
           state.funct["(context)"] && state.funct["(context)"]["(verb)"] === "class";
  }


  function isPropertyName(token) {
    return token.identifier || token.id === "(string)" || token.id === "(number)";
  }


  function propertyName(preserveOrToken) {
    var id;
    var preserve = true;
    if (typeof preserveOrToken === "object") {
      id = preserveOrToken;
    } else {
      preserve = preserveOrToken;
      id = optionalidentifier(false, true, preserve);
    }

    if (!id) {
      if (state.tokens.next.id === "(string)") {
        id = state.tokens.next.value;
        if (!preserve) {
          advance();
        }
      } else if (state.tokens.next.id === "(number)") {
        id = state.tokens.next.value.toString();
        if (!preserve) {
          advance();
        }
      }
    } else if (typeof id === "object") {
      if (id.id === "(string)" || id.id === "(identifier)") id = id.value;
      else if (id.id === "(number)") id = id.value.toString();
    }

    if (id === "hasOwnProperty") {
      warning("W001");
    }

    return id;
  }

  /**
   * @param {Object} [options]
   * @param {token} [options.loneArg] The argument to the function in cases
   *                                  where it was defined using the
   *                                  single-argument shorthand.
   * @param {bool} [options.parsedOpening] Whether the opening parenthesis has
   *                                       already been parsed.
   * @returns {{ arity: number, params: Array.<string>}}
   */
  function functionparams(options) {
    var next;
    var paramsIds = [];
    var ident;
    var tokens = [];
    var t;
    var pastDefault = false;
    var pastRest = false;
    var arity = 0;
    var loneArg = options && options.loneArg;

    if (loneArg && loneArg.identifier === true) {
      state.funct["(scope)"].addParam(loneArg.value, loneArg);
      return { arity: 1, params: [ loneArg.value ] };
    }

    next = state.tokens.next;

    if (!options || !options.parsedOpening) {
      advance("(");
    }

    if (state.tokens.next.id === ")") {
      advance(")");
      return;
    }

    function addParam(addParamArgs) {
      state.funct["(scope)"].addParam.apply(state.funct["(scope)"], addParamArgs);
    }

    for (;;) {
      arity++;
      // are added to the param scope
      var currentParams = [];

      if (_.contains(["{", "["], state.tokens.next.id)) {
        tokens = destructuringPattern();
        for (t in tokens) {
          t = tokens[t];
          if (t.id) {
            paramsIds.push(t.id);
            currentParams.push([t.id, t.token]);
          }
        }
      } else {
        if (checkPunctuator(state.tokens.next, "...")) pastRest = true;
        ident = identifier(true);
        if (ident) {
          paramsIds.push(ident);
          currentParams.push([ident, state.tokens.curr]);
        } else {
          // Skip invalid parameter.
          while (!checkPunctuators(state.tokens.next, [",", ")"])) advance();
        }
      }

      // It is valid to have a regular argument after a default argument
      // since undefined can be used for missing parameters. Still warn as it is
      // a possible code smell.
      if (pastDefault) {
        if (state.tokens.next.id !== "=") {
          error("W138", state.tokens.current);
        }
      }
      if (state.tokens.next.id === "=") {
        if (!state.inES6()) {
          warning("W119", state.tokens.next, "default parameters", "6");
        }
        advance("=");
        pastDefault = true;
        expression(10);
      }

      // now we have evaluated the default expression, add the variable to the param scope
      currentParams.forEach(addParam);

      if (state.tokens.next.id === ",") {
        if (pastRest) {
          warning("W131", state.tokens.next);
        }
        parseComma();
      } else {
        advance(")", next);
        return { arity: arity, params: paramsIds };
      }
    }
  }

  function functor(name, token, overwrites) {
    var funct = {
      "(name)"      : name,
      "(breakage)"  : 0,
      "(loopage)"   : 0,
      "(tokens)"    : {},
      "(properties)": {},

      "(catch)"     : false,
      "(global)"    : false,

      "(line)"      : null,
      "(character)" : null,
      "(metrics)"   : null,
      "(statement)" : null,
      "(context)"   : null,
      "(scope)"     : null,
      "(comparray)" : null,
      "(generator)" : null,
      "(arrow)"     : null,
      "(params)"    : null
    };

    if (token) {
      _.extend(funct, {
        "(line)"     : token.line,
        "(character)": token.character,
        "(metrics)"  : createMetrics(token)
      });
    }

    _.extend(funct, overwrites);

    if (funct["(context)"]) {
      funct["(scope)"] = funct["(context)"]["(scope)"];
      funct["(comparray)"]  = funct["(context)"]["(comparray)"];
    }

    return funct;
  }

  function isFunctor(token) {
    return "(scope)" in token;
  }

  /**
   * Determine if the parser has begun parsing executable code.
   *
   * @param {Token} funct - The current "functor" token
   *
   * @returns {boolean}
   */
  function hasParsedCode(funct) {
    return funct["(global)"] && !funct["(verb)"];
  }

  function doTemplateLiteral(left) {
    // ASSERT: this.type === "(template)"
    // jshint validthis: true
    var ctx = this.context;
    var noSubst = this.noSubst;
    var depth = this.depth;

    if (!noSubst) {
      while (!end()) {
        if (!state.tokens.next.template || state.tokens.next.depth > depth) {
          expression(0); // should probably have different rbp?
        } else {
          // skip template start / middle
          advance();
        }
      }
    }

    return {
      id: "(template)",
      type: "(template)",
      tag: left
    };

    function end() {
      if (state.tokens.curr.template && state.tokens.curr.tail &&
          state.tokens.curr.context === ctx) return true;
      var complete = (state.tokens.next.template && state.tokens.next.tail &&
                      state.tokens.next.context === ctx);
      if (complete) advance();
      return complete || state.tokens.next.isUnclosed;
    }
  }

  /**
   * @param {Object} [options]
   * @param {token} [options.name] The identifier belonging to the function (if
   *                               any)
   * @param {boolean} [options.statement] The statement that triggered creation
   *                                      of the current function.
   * @param {string} [options.type] If specified, either "generator" or "arrow"
   * @param {token} [options.loneArg] The argument to the function in cases
   *                                  where it was defined using the
   *                                  single-argument shorthand
   * @param {bool} [options.parsedOpening] Whether the opening parenthesis has
   *                                       already been parsed
   * @param {token} [options.classExprBinding] Define a function with this
   *                                           identifier in the new function's
   *                                           scope, mimicking the bahavior of
   *                                           class expression names within
   *                                           the body of member functions.
   */
  function doFunction(options) {
    var f, token, name, statement, classExprBinding, isGenerator, isArrow, ignoreLoopFunc;
    var oldOption = state.option;
    var oldIgnored = state.ignored;

    if (options) {
      name = options.name;
      statement = options.statement;
      classExprBinding = options.classExprBinding;
      isGenerator = options.type === "generator";
      isArrow = options.type === "arrow";
      ignoreLoopFunc = options.ignoreLoopFunc;
    }

    state.option = Object.create(state.option);
    state.ignored = Object.create(state.ignored);

    state.funct = functor(name || state.nameStack.infer(), state.tokens.next, {
      "(statement)": statement,
      "(context)":   state.funct,
      "(arrow)":     isArrow,
      "(generator)": isGenerator
    });

    f = state.funct;
    token = state.tokens.curr;
    token.funct = state.funct;

    functions.push(state.funct);

    // So that the function is available to itself and referencing itself is not
    // seen as a closure, add the function name to a new scope, but do not
    // test for unused (unused: false)
    // it is a new block scope so that params can override it, it can be block scoped
    // but declarations inside the function don't cause already declared error
    state.funct["(scope)"].stack("functionouter");
    var internallyAccessibleName = name || classExprBinding;
    if (internallyAccessibleName) {
      state.funct["(scope)"].block.add(internallyAccessibleName,
        classExprBinding ? "class" : "function", state.tokens.curr, false);
    }

    // create the param scope (params added in functionparams)
    state.funct["(scope)"].stack("functionparams");

    var paramsInfo = functionparams(options);

    if (paramsInfo) {
      state.funct["(params)"] = paramsInfo.params;
      state.funct["(metrics)"].arity = paramsInfo.arity;
      state.funct["(metrics)"].verifyMaxParametersPerFunction();
    } else {
      state.funct["(metrics)"].arity = 0;
    }

    if (isArrow) {
      if (!state.inES6(true)) {
        warning("W119", state.tokens.curr, "arrow function syntax (=>)", "6");
      }

      if (!options.loneArg) {
        advance("=>");
      }
    }

    block(false, true, true, isArrow);

    if (!state.option.noyield && isGenerator &&
        state.funct["(generator)"] !== "yielded") {
      warning("W124", state.tokens.curr);
    }

    state.funct["(metrics)"].verifyMaxStatementsPerFunction();
    state.funct["(metrics)"].verifyMaxComplexityPerFunction();
    state.funct["(unusedOption)"] = state.option.unused;
    state.option = oldOption;
    state.ignored = oldIgnored;
    state.funct["(last)"] = state.tokens.curr.line;
    state.funct["(lastcharacter)"] = state.tokens.curr.character;

    // unstack the params scope
    state.funct["(scope)"].unstack(); // also does usage and label checks

    // unstack the function outer stack
    state.funct["(scope)"].unstack();

    state.funct = state.funct["(context)"];

    if (!ignoreLoopFunc && !state.option.loopfunc && state.funct["(loopage)"]) {
      // If the function we just parsed accesses any non-local variables
      // trigger a warning. Otherwise, the function is safe even within
      // a loop.
      if (f["(isCapturing)"]) {
        warning("W083", token);
      }
    }

    return f;
  }

  function createMetrics(functionStartToken) {
    return {
      statementCount: 0,
      nestedBlockDepth: -1,
      ComplexityCount: 1,
      arity: 0,

      verifyMaxStatementsPerFunction: function() {
        if (state.option.maxstatements &&
          this.statementCount > state.option.maxstatements) {
          warning("W071", functionStartToken, this.statementCount);
        }
      },

      verifyMaxParametersPerFunction: function() {
        if (_.isNumber(state.option.maxparams) &&
          this.arity > state.option.maxparams) {
          warning("W072", functionStartToken, this.arity);
        }
      },

      verifyMaxNestedBlockDepthPerFunction: function() {
        if (state.option.maxdepth &&
          this.nestedBlockDepth > 0 &&
          this.nestedBlockDepth === state.option.maxdepth + 1) {
          warning("W073", null, this.nestedBlockDepth);
        }
      },

      verifyMaxComplexityPerFunction: function() {
        var max = state.option.maxcomplexity;
        var cc = this.ComplexityCount;
        if (max && cc > max) {
          warning("W074", functionStartToken, cc);
        }
      }
    };
  }

  function increaseComplexityCount() {
    state.funct["(metrics)"].ComplexityCount += 1;
  }

  // Parse assignments that were found instead of conditionals.
  // For example: if (a = 1) { ... }

  function checkCondAssignment(expr) {
    var id, paren;
    if (expr) {
      id = expr.id;
      paren = expr.paren;
      if (id === "," && (expr = expr.exprs[expr.exprs.length - 1])) {
        id = expr.id;
        paren = paren || expr.paren;
      }
    }
    switch (id) {
    case "=":
    case "+=":
    case "-=":
    case "*=":
    case "%=":
    case "&=":
    case "|=":
    case "^=":
    case "/=":
      if (!paren && !state.option.boss) {
        warning("W084");
      }
    }
  }

  /**
   * @param {object} props Collection of property descriptors for a given
   *                       object.
   */
  function checkProperties(props) {
    // Check for lonely setters if in the ES5 mode.
    if (state.inES5()) {
      for (var name in props) {
        if (props[name] && props[name].setterToken && !props[name].getterToken) {
          warning("W078", props[name].setterToken);
        }
      }
    }
  }

  function metaProperty(name, c) {
    if (checkPunctuator(state.tokens.next, ".")) {
      var left = state.tokens.curr.id;
      advance(".");
      var id = identifier();
      state.tokens.curr.isMetaProperty = true;
      if (name !== id) {
        error("E057", state.tokens.prev, left, id);
      } else {
        c();
      }
      return state.tokens.curr;
    }
  }

  (function(x) {
    x.nud = function() {
      var b, f, i, p, t, isGeneratorMethod = false, nextVal;
      var props = Object.create(null); // All properties, including accessors

      b = state.tokens.curr.line !== startLine(state.tokens.next);
      if (b) {
        indent += state.option.indent;
        if (state.tokens.next.from === indent + state.option.indent) {
          indent += state.option.indent;
        }
      }

      var blocktype = lookupBlockType();
      if (blocktype.isDestAssign) {
        this.destructAssign = destructuringPattern({ openingParsed: true, assignment: true });
        return this;
      }

      for (;;) {
        if (state.tokens.next.id === "}") {
          break;
        }

        nextVal = state.tokens.next.value;
        if (state.tokens.next.identifier &&
            (peekIgnoreEOL().id === "," || peekIgnoreEOL().id === "}")) {
          if (!state.inES6()) {
            warning("W104", state.tokens.next, "object short notation", "6");
          }
          i = propertyName(true);
          saveProperty(props, i, state.tokens.next);

          expression(10);

        } else if (peek().id !== ":" && (nextVal === "get" || nextVal === "set")) {
          advance(nextVal);

          if (!state.inES5()) {
            error("E034");
          }

          i = propertyName();

          // ES6 allows for get() {...} and set() {...} method
          // definition shorthand syntax, so we don't produce an error
          // if linting ECMAScript 6 code.
          if (!i && !state.inES6()) {
            error("E035");
          }

          // We don't want to save this getter unless it's an actual getter
          // and not an ES6 concise method
          if (i) {
            saveAccessor(nextVal, props, i, state.tokens.curr);
          }

          t = state.tokens.next;
          f = doFunction();
          p = f["(params)"];

          // Don't warn about getter/setter pairs if this is an ES6 concise method
          if (nextVal === "get" && i && p) {
            warning("W076", t, p[0], i);
          } else if (nextVal === "set" && i && f["(metrics)"].arity !== 1) {
            warning("W077", t, i);
          }
        } else {
          if (state.tokens.next.value === "*" && state.tokens.next.type === "(punctuator)") {
            if (!state.inES6()) {
              warning("W104", state.tokens.next, "generator functions", "6");
            }
            advance("*");
            isGeneratorMethod = true;
          } else {
            isGeneratorMethod = false;
          }

          if (state.tokens.next.id === "[") {
            i = computedPropertyName();
            state.nameStack.set(i);
          } else {
            state.nameStack.set(state.tokens.next);
            i = propertyName();
            saveProperty(props, i, state.tokens.next);

            if (typeof i !== "string") {
              break;
            }
          }

          if (state.tokens.next.value === "(") {
            if (!state.inES6()) {
              warning("W104", state.tokens.curr, "concise methods", "6");
            }
            doFunction({ type: isGeneratorMethod ? "generator" : null });
          } else {
            advance(":");
            expression(10);
          }
        }

        countMember(i);

        if (state.tokens.next.id === ",") {
          parseComma({ allowTrailing: true, property: true });
          if (state.tokens.next.id === ",") {
            warning("W070", state.tokens.curr);
          } else if (state.tokens.next.id === "}" && !state.inES5()) {
            warning("W070", state.tokens.curr);
          }
        } else {
          break;
        }
      }
      if (b) {
        indent -= state.option.indent;
      }
      advance("}", this);

      checkProperties(props);

      return this;
    };
    x.fud = function() {
      error("E036", state.tokens.curr);
    };
  }(delim("{")));

  function destructuringPattern(options) {
    var isAssignment = options && options.assignment;

    if (!state.inES6()) {
      warning("W104", state.tokens.curr,
        isAssignment ? "destructuring assignment" : "destructuring binding", "6");
    }

    return destructuringPatternRecursive(options);
  }

  function destructuringPatternRecursive(options) {
    var ids;
    var identifiers = [];
    var openingParsed = options && options.openingParsed;
    var isAssignment = options && options.assignment;
    var recursiveOptions = isAssignment ? { assignment: isAssignment } : null;
    var firstToken = openingParsed ? state.tokens.curr : state.tokens.next;

    var nextInnerDE = function() {
      var ident;
      if (checkPunctuators(state.tokens.next, ["[", "{"])) {
        ids = destructuringPatternRecursive(recursiveOptions);
        for (var id in ids) {
          id = ids[id];
          identifiers.push({ id: id.id, token: id.token });
        }
      } else if (checkPunctuator(state.tokens.next, ",")) {
        identifiers.push({ id: null, token: state.tokens.curr });
      } else if (checkPunctuator(state.tokens.next, "(")) {
        advance("(");
        nextInnerDE();
        advance(")");
      } else {
        var is_rest = checkPunctuator(state.tokens.next, "...");

        if (isAssignment) {
          var assignTarget = expression(20);
          if (assignTarget) {
            checkLeftSideAssign(assignTarget);

            // if the target was a simple identifier, add it to the list to return
            if (assignTarget.identifier) {
              ident = assignTarget.value;
            }
          }
        } else {
          ident = identifier();
        }
        if (ident) {
          identifiers.push({ id: ident, token: state.tokens.curr });
        }
        return is_rest;
      }
      return false;
    };
    var assignmentProperty = function() {
      var id;
      if (checkPunctuator(state.tokens.next, "[")) {
        advance("[");
        expression(10);
        advance("]");
        advance(":");
        nextInnerDE();
      } else if (state.tokens.next.id === "(string)" ||
                 state.tokens.next.id === "(number)") {
        advance();
        advance(":");
        nextInnerDE();
      } else {
        // this id will either be the property name or the property name and the assigning identifier
        id = identifier();
        if (checkPunctuator(state.tokens.next, ":")) {
          advance(":");
          nextInnerDE();
        } else if (id) {
          // in this case we are assigning (not declaring), so check assignment
          if (isAssignment) {
            checkLeftSideAssign(state.tokens.curr);
          }
          identifiers.push({ id: id, token: state.tokens.curr });
        }
      }
    };

    var id, value;
    if (checkPunctuator(firstToken, "[")) {
      if (!openingParsed) {
        advance("[");
      }
      if (checkPunctuator(state.tokens.next, "]")) {
        warning("W137", state.tokens.curr);
      }
      var element_after_rest = false;
      while (!checkPunctuator(state.tokens.next, "]")) {
        if (nextInnerDE() && !element_after_rest &&
            checkPunctuator(state.tokens.next, ",")) {
          warning("W130", state.tokens.next);
          element_after_rest = true;
        }
        if (checkPunctuator(state.tokens.next, "=")) {
          if (checkPunctuator(state.tokens.prev, "...")) {
            advance("]");
          } else {
            advance("=");
          }
          id = state.tokens.prev;
          value = expression(10);
          if (value && value.type === "undefined") {
            warning("W080", id, id.value);
          }
        }
        if (!checkPunctuator(state.tokens.next, "]")) {
          advance(",");
        }
      }
      advance("]");
    } else if (checkPunctuator(firstToken, "{")) {

      if (!openingParsed) {
        advance("{");
      }
      if (checkPunctuator(state.tokens.next, "}")) {
        warning("W137", state.tokens.curr);
      }
      while (!checkPunctuator(state.tokens.next, "}")) {
        assignmentProperty();
        if (checkPunctuator(state.tokens.next, "=")) {
          advance("=");
          id = state.tokens.prev;
          value = expression(10);
          if (value && value.type === "undefined") {
            warning("W080", id, id.value);
          }
        }
        if (!checkPunctuator(state.tokens.next, "}")) {
          advance(",");
          if (checkPunctuator(state.tokens.next, "}")) {
            // Trailing comma
            // ObjectBindingPattern: { BindingPropertyList , }
            break;
          }
        }
      }
      advance("}");
    }
    return identifiers;
  }

  function destructuringPatternMatch(tokens, value) {
    var first = value.first;

    if (!first)
      return;

    _.zip(tokens, Array.isArray(first) ? first : [ first ]).forEach(function(val) {
      var token = val[0];
      var value = val[1];

      if (token && value)
        token.first = value;
      else if (token && token.first && !value)
        warning("W080", token.first, token.first.value);
    });
  }

  function blockVariableStatement(type, statement, context) {
    // used for both let and const statements

    var prefix = context && context.prefix;
    var inexport = context && context.inexport;
    var isLet = type === "let";
    var isConst = type === "const";
    var tokens, lone, value, letblock;

    if (!state.inES6()) {
      warning("W104", state.tokens.curr, type, "6");
    }

    if (isLet && state.tokens.next.value === "(") {
      if (!state.inMoz()) {
        warning("W118", state.tokens.next, "let block");
      }
      advance("(");
      state.funct["(scope)"].stack();
      letblock = true;
    } else if (state.funct["(noblockscopedvar)"]) {
      error("E048", state.tokens.curr, isConst ? "Const" : "Let");
    }

    statement.first = [];
    for (;;) {
      var names = [];
      if (_.contains(["{", "["], state.tokens.next.value)) {
        tokens = destructuringPattern();
        lone = false;
      } else {
        tokens = [ { id: identifier(), token: state.tokens.curr } ];
        lone = true;
      }

      if (!prefix && isConst && state.tokens.next.id !== "=") {
        warning("E012", state.tokens.curr, state.tokens.curr.value);
      }

      for (var t in tokens) {
        if (tokens.hasOwnProperty(t)) {
          t = tokens[t];
          if (state.funct["(scope)"].block.isGlobal()) {
            if (predefined[t.id] === false) {
              warning("W079", t.token, t.id);
            }
          }
          if (t.id && !state.funct["(noblockscopedvar)"]) {
            state.funct["(scope)"].addlabel(t.id, {
              type: type,
              token: t.token });
            names.push(t.token);

            if (lone && inexport) {
              state.funct["(scope)"].setExported(t.token.value, t.token);
            }
          }
        }
      }

      if (state.tokens.next.id === "=") {
        advance("=");
        if (!prefix && peek(0).id === "=" && state.tokens.next.identifier) {
          warning("W120", state.tokens.next, state.tokens.next.value);
        }
        var id = state.tokens.prev;
        // don't accept `in` in expression if prefix is used for ForIn/Of loop.
        value = expression(prefix ? 120 : 10);
        if (!prefix && value && value.type === "undefined") {
          warning("W080", id, id.value);
        }
        if (lone) {
          tokens[0].first = value;
        } else {
          destructuringPatternMatch(names, value);
        }
      }

      statement.first = statement.first.concat(names);

      if (state.tokens.next.id !== ",") {
        break;
      }
      parseComma();
    }
    if (letblock) {
      advance(")");
      block(true, true);
      statement.block = true;
      state.funct["(scope)"].unstack();
    }

    return statement;
  }

  var conststatement = stmt("const", function(context) {
    return blockVariableStatement("const", this, context);
  });
  conststatement.exps = true;

  var letstatement = stmt("let", function(context) {
    return blockVariableStatement("let", this, context);
  });
  letstatement.exps = true;

  var varstatement = stmt("var", function(context) {
    var prefix = context && context.prefix;
    var inexport = context && context.inexport;
    var tokens, lone, value;

    // If the `implied` option is set, bindings are set differently.
    var implied = context && context.implied;
    var report = !(context && context.ignore);

    this.first = [];
    for (;;) {
      var names = [];
      if (_.contains(["{", "["], state.tokens.next.value)) {
        tokens = destructuringPattern();
        lone = false;
      } else {
        tokens = [ { id: identifier(), token: state.tokens.curr } ];
        lone = true;
      }

      if (!(prefix && implied) && report && state.option.varstmt) {
        warning("W132", this);
      }

      this.first = this.first.concat(names);

      for (var t in tokens) {
        if (tokens.hasOwnProperty(t)) {
          t = tokens[t];
          if (!implied && state.funct["(global)"] && !state.impliedClosure()) {
            if (predefined[t.id] === false) {
              warning("W079", t.token, t.id);
            } else if (state.option.futurehostile === false) {
              if ((!state.inES5() && vars.ecmaIdentifiers[5][t.id] === false) ||
                (!state.inES6() && vars.ecmaIdentifiers[6][t.id] === false)) {
                warning("W129", t.token, t.id);
              }
            }
          }
          if (t.id) {
            if (implied === "for") {

              if (!state.funct["(scope)"].has(t.id)) {
                if (report) warning("W088", t.token, t.id);
              }
              state.funct["(scope)"].block.use(t.id, t.token);
            } else {
              state.funct["(scope)"].addlabel(t.id, {
                type: "var",
                token: t.token });

              if (lone && inexport) {
                state.funct["(scope)"].setExported(t.id, t.token);
              }
            }
            names.push(t.token);
          }
        }
      }

      if (state.tokens.next.id === "=") {
        state.nameStack.set(state.tokens.curr);

        advance("=");
        if (peek(0).id === "=" && state.tokens.next.identifier) {
          if (!prefix && report &&
              !state.funct["(params)"] ||
              state.funct["(params)"].indexOf(state.tokens.next.value) === -1) {
            warning("W120", state.tokens.next, state.tokens.next.value);
          }
        }
        var id = state.tokens.prev;
        // don't accept `in` in expression if prefix is used for ForIn/Of loop.
        value = expression(prefix ? 120 : 10);
        if (value && !prefix && report && !state.funct["(loopage)"] && value.type === "undefined") {
          warning("W080", id, id.value);
        }
        if (lone) {
          tokens[0].first = value;
        } else {
          destructuringPatternMatch(names, value);
        }
      }

      if (state.tokens.next.id !== ",") {
        break;
      }
      parseComma();
    }

    return this;
  });
  varstatement.exps = true;

  blockstmt("class", function() {
    return classdef.call(this, true);
  });

  function classdef(isStatement) {

    /*jshint validthis:true */
    if (!state.inES6()) {
      warning("W104", state.tokens.curr, "class", "6");
    }
    if (isStatement) {
      // BindingIdentifier
      this.name = identifier();

      state.funct["(scope)"].addlabel(this.name, {
        type: "class",
        token: state.tokens.curr });
    } else if (state.tokens.next.identifier && state.tokens.next.value !== "extends") {
      // BindingIdentifier(opt)
      this.name = identifier();
      this.namedExpr = true;
    } else {
      this.name = state.nameStack.infer();
    }
    classtail(this);
    return this;
  }

  function classtail(c) {
    var wasInClassBody = state.inClassBody;
    // ClassHeritage(opt)
    if (state.tokens.next.value === "extends") {
      advance("extends");
      c.heritage = expression(10);
    }

    state.inClassBody = true;
    advance("{");
    // ClassBody(opt)
    c.body = classbody(c);
    advance("}");
    state.inClassBody = wasInClassBody;
  }

  function classbody(c) {
    var name;
    var isStatic;
    var isGenerator;
    var getset;
    var props = Object.create(null);
    var staticProps = Object.create(null);
    var computed;
    for (var i = 0; state.tokens.next.id !== "}"; ++i) {
      name = state.tokens.next;
      isStatic = false;
      isGenerator = false;
      getset = null;

      // The ES6 grammar for ClassElement includes the `;` token, but it is
      // defined only as a placeholder to facilitate future language
      // extensions. In ES6 code, it serves no purpose.
      if (name.id === ";") {
        warning("W032");
        advance(";");
        continue;
      }

      if (name.id === "*") {
        isGenerator = true;
        advance("*");
        name = state.tokens.next;
      }
      if (name.id === "[") {
        name = computedPropertyName();
        computed = true;
      } else if (isPropertyName(name)) {
        // Non-Computed PropertyName
        advance();
        computed = false;
        if (name.identifier && name.value === "static") {
          if (checkPunctuator(state.tokens.next, "*")) {
            isGenerator = true;
            advance("*");
          }
          if (isPropertyName(state.tokens.next) || state.tokens.next.id === "[") {
            computed = state.tokens.next.id === "[";
            isStatic = true;
            name = state.tokens.next;
            if (state.tokens.next.id === "[") {
              name = computedPropertyName();
            } else advance();
          }
        }

        if (name.identifier && (name.value === "get" || name.value === "set")) {
          if (isPropertyName(state.tokens.next) || state.tokens.next.id === "[") {
            computed = state.tokens.next.id === "[";
            getset = name;
            name = state.tokens.next;
            if (state.tokens.next.id === "[") {
              name = computedPropertyName();
            } else advance();
          }
        }
      } else {
        warning("W052", state.tokens.next, state.tokens.next.value || state.tokens.next.type);
        advance();
        continue;
      }

      if (!checkPunctuator(state.tokens.next, "(")) {
        // error --- class properties must be methods
        error("E054", state.tokens.next, state.tokens.next.value);
        while (state.tokens.next.id !== "}" &&
               !checkPunctuator(state.tokens.next, "(")) {
          advance();
        }
        if (state.tokens.next.value !== "(") {
          doFunction({ statement: c });
        }
      }

      if (!computed) {
        // We don't know how to determine if we have duplicate computed property names :(
        if (getset) {
          saveAccessor(
            getset.value, isStatic ? staticProps : props, name.value, name, true, isStatic);
        } else {
          if (name.value === "constructor") {
            state.nameStack.set(c);
          } else {
            state.nameStack.set(name);
          }
          saveProperty(isStatic ? staticProps : props, name.value, name, true, isStatic);
        }
      }

      if (getset && name.value === "constructor") {
        var propDesc = getset.value === "get" ? "class getter method" : "class setter method";
        error("E049", name, propDesc, "constructor");
      } else if (name.value === "prototype") {
        error("E049", name, "class method", "prototype");
      }

      propertyName(name);

      doFunction({
        statement: c,
        type: isGenerator ? "generator" : null,
        classExprBinding: c.namedExpr ? c.name : null
      });
    }

    checkProperties(props);
  }

  blockstmt("function", function(context) {
    var inexport = context && context.inexport;
    var generator = false;
    if (state.tokens.next.value === "*") {
      advance("*");
      if (state.inES6(true)) {
        generator = true;
      } else {
        warning("W119", state.tokens.curr, "function*", "6");
      }
    }
    if (inblock) {
      warning("W082", state.tokens.curr);
    }
    var i = optionalidentifier();

    state.funct["(scope)"].addlabel(i, {
      type: "function",
      token: state.tokens.curr });

    if (i === undefined) {
      warning("W025");
    } else if (inexport) {
      state.funct["(scope)"].setExported(i, state.tokens.prev);
    }

    doFunction({
      name: i,
      statement: this,
      type: generator ? "generator" : null,
      ignoreLoopFunc: inblock // a declaration may already have warned
    });
    if (state.tokens.next.id === "(" && state.tokens.next.line === state.tokens.curr.line) {
      error("E039");
    }
    return this;
  });

  prefix("function", function() {
    var generator = false;

    if (state.tokens.next.value === "*") {
      if (!state.inES6()) {
        warning("W119", state.tokens.curr, "function*", "6");
      }
      advance("*");
      generator = true;
    }

    var i = optionalidentifier();
    doFunction({ name: i, type: generator ? "generator" : null });
    return this;
  });

  blockstmt("if", function() {
    var t = state.tokens.next;
    increaseComplexityCount();
    state.condition = true;
    advance("(");
    var expr = expression(0);
    checkCondAssignment(expr);

    // When the if is within a for-in loop, check if the condition
    // starts with a negation operator
    var forinifcheck = null;
    if (state.option.forin && state.forinifcheckneeded) {
      state.forinifcheckneeded = false; // We only need to analyze the first if inside the loop
      forinifcheck = state.forinifchecks[state.forinifchecks.length - 1];
      if (expr.type === "(punctuator)" && expr.value === "!") {
        forinifcheck.type = "(negative)";
      } else {
        forinifcheck.type = "(positive)";
      }
    }

    advance(")", t);
    state.condition = false;
    var s = block(true, true);

    // When the if is within a for-in loop and the condition has a negative form,
    // check if the body contains nothing but a continue statement
    if (forinifcheck && forinifcheck.type === "(negative)") {
      if (s && s[0] && s[0].type === "(identifier)" && s[0].value === "continue") {
        forinifcheck.type = "(negative-with-continue)";
      }
    }

    if (state.tokens.next.id === "else") {
      advance("else");
      if (state.tokens.next.id === "if" || state.tokens.next.id === "switch") {
        statement();
      } else {
        block(true, true);
      }
    }
    return this;
  });

  blockstmt("try", function() {
    var b;

    function doCatch() {
      advance("catch");
      advance("(");

      state.funct["(scope)"].stack("catchparams");

      if (checkPunctuators(state.tokens.next, ["[", "{"])) {
        var tokens = destructuringPattern();
        _.each(tokens, function(token) {
          if (token.id) {
            state.funct["(scope)"].addParam(token.id, token, "exception");
          }
        });
      } else if (state.tokens.next.type !== "(identifier)") {
        warning("E030", state.tokens.next, state.tokens.next.value);
      } else {
        // only advance if we have an identifier so we can continue parsing in the most common error - that no param is given.
        state.funct["(scope)"].addParam(identifier(), state.tokens.curr, "exception");
      }

      if (state.tokens.next.value === "if") {
        if (!state.inMoz()) {
          warning("W118", state.tokens.curr, "catch filter");
        }
        advance("if");
        expression(0);
      }

      advance(")");

      block(false);

      state.funct["(scope)"].unstack();
    }

    block(true);

    while (state.tokens.next.id === "catch") {
      increaseComplexityCount();
      if (b && (!state.inMoz())) {
        warning("W118", state.tokens.next, "multiple catch blocks");
      }
      doCatch();
      b = true;
    }

    if (state.tokens.next.id === "finally") {
      advance("finally");
      block(true);
      return;
    }

    if (!b) {
      error("E021", state.tokens.next, "catch", state.tokens.next.value);
    }

    return this;
  });

  blockstmt("while", function() {
    var t = state.tokens.next;
    state.funct["(breakage)"] += 1;
    state.funct["(loopage)"] += 1;
    increaseComplexityCount();
    advance("(");
    checkCondAssignment(expression(0));
    advance(")", t);
    block(true, true);
    state.funct["(breakage)"] -= 1;
    state.funct["(loopage)"] -= 1;
    return this;
  }).labelled = true;

  blockstmt("with", function() {
    var t = state.tokens.next;
    if (state.isStrict()) {
      error("E010", state.tokens.curr);
    } else if (!state.option.withstmt) {
      warning("W085", state.tokens.curr);
    }

    advance("(");
    expression(0);
    advance(")", t);
    block(true, true);

    return this;
  });

  blockstmt("switch", function() {
    var t = state.tokens.next;
    var g = false;
    var noindent = false;

    state.funct["(breakage)"] += 1;
    advance("(");
    checkCondAssignment(expression(0));
    advance(")", t);
    t = state.tokens.next;
    advance("{");

    if (state.tokens.next.from === indent)
      noindent = true;

    if (!noindent)
      indent += state.option.indent;

    this.cases = [];

    for (;;) {
      switch (state.tokens.next.id) {
      case "case":
        switch (state.funct["(verb)"]) {
        case "yield":
        case "break":
        case "case":
        case "continue":
        case "return":
        case "switch":
        case "throw":
          break;
        default:
          // You can tell JSHint that you don't use break intentionally by
          // adding a comment /* falls through */ on a line just before
          // the next `case`.
          if (!state.tokens.curr.caseFallsThrough) {
            warning("W086", state.tokens.curr, "case");
          }
        }

        advance("case");
        this.cases.push(expression(0));
        increaseComplexityCount();
        g = true;
        advance(":");
        state.funct["(verb)"] = "case";
        break;
      case "default":
        switch (state.funct["(verb)"]) {
        case "yield":
        case "break":
        case "continue":
        case "return":
        case "throw":
          break;
        default:
          // Do not display a warning if 'default' is the first statement or if
          // there is a special /* falls through */ comment.
          if (this.cases.length) {
            if (!state.tokens.curr.caseFallsThrough) {
              warning("W086", state.tokens.curr, "default");
            }
          }
        }

        advance("default");
        g = true;
        advance(":");
        break;
      case "}":
        if (!noindent)
          indent -= state.option.indent;

        advance("}", t);
        state.funct["(breakage)"] -= 1;
        state.funct["(verb)"] = undefined;
        return;
      case "(end)":
        error("E023", state.tokens.next, "}");
        return;
      default:
        indent += state.option.indent;
        if (g) {
          switch (state.tokens.curr.id) {
          case ",":
            error("E040");
            return;
          case ":":
            g = false;
            statements();
            break;
          default:
            error("E025", state.tokens.curr);
            return;
          }
        } else {
          if (state.tokens.curr.id === ":") {
            advance(":");
            error("E024", state.tokens.curr, ":");
            statements();
          } else {
            error("E021", state.tokens.next, "case", state.tokens.next.value);
            return;
          }
        }
        indent -= state.option.indent;
      }
    }
    return this;
  }).labelled = true;

  stmt("debugger", function() {
    if (!state.option.debug) {
      warning("W087", this);
    }
    return this;
  }).exps = true;

  (function() {
    var x = stmt("do", function() {
      state.funct["(breakage)"] += 1;
      state.funct["(loopage)"] += 1;
      increaseComplexityCount();

      this.first = block(true, true);
      advance("while");
      var t = state.tokens.next;
      advance("(");
      checkCondAssignment(expression(0));
      advance(")", t);
      state.funct["(breakage)"] -= 1;
      state.funct["(loopage)"] -= 1;
      return this;
    });
    x.labelled = true;
    x.exps = true;
  }());

  blockstmt("for", function() {
    var s, t = state.tokens.next;
    var letscope = false;
    var foreachtok = null;

    if (t.value === "each") {
      foreachtok = t;
      advance("each");
      if (!state.inMoz()) {
        warning("W118", state.tokens.curr, "for each");
      }
    }

    increaseComplexityCount();
    advance("(");

    // what kind of for(…) statement it is? for(…of…)? for(…in…)? for(…;…;…)?
    var nextop; // contains the token of the "in" or "of" operator
    var i = 0;
    var inof = ["in", "of"];
    var level = 0; // BindingPattern "level" --- level 0 === no BindingPattern
    var comma; // First comma punctuator at level 0
    var initializer; // First initializer at level 0

    // If initial token is a BindingPattern, count it as such.
    if (checkPunctuators(state.tokens.next, ["{", "["])) ++level;
    do {
      nextop = peek(i);
      ++i;
      if (checkPunctuators(nextop, ["{", "["])) ++level;
      else if (checkPunctuators(nextop, ["}", "]"])) --level;
      if (level < 0) break;
      if (level === 0) {
        if (!comma && checkPunctuator(nextop, ",")) comma = nextop;
        else if (!initializer && checkPunctuator(nextop, "=")) initializer = nextop;
      }
    } while (level > 0 || !_.contains(inof, nextop.value) && nextop.value !== ";" &&
    nextop.type !== "(end)"); // Is this a JSCS bug? This looks really weird.

    // if we're in a for (… in|of …) statement
    if (_.contains(inof, nextop.value)) {
      if (!state.inES6() && nextop.value === "of") {
        warning("W104", nextop, "for of", "6");
      }

      var ok = !(initializer || comma);
      if (initializer) {
        error("W133", comma, nextop.value, "initializer is forbidden");
      }

      if (comma) {
        error("W133", comma, nextop.value, "more than one ForBinding");
      }

      if (state.tokens.next.id === "var") {
        advance("var");
        state.tokens.curr.fud({ prefix: true });
      } else if (state.tokens.next.id === "let" || state.tokens.next.id === "const") {
        advance(state.tokens.next.id);
        // create a new block scope
        letscope = true;
        state.funct["(scope)"].stack();
        state.tokens.curr.fud({ prefix: true });
      } else {
        // Parse as a var statement, with implied bindings. Ignore errors if an error
        // was already reported
        Object.create(varstatement).fud({ prefix: true, implied: "for", ignore: !ok });
      }
      advance(nextop.value);
      expression(20);
      advance(")", t);

      if (nextop.value === "in" && state.option.forin) {
        state.forinifcheckneeded = true;

        if (state.forinifchecks === undefined) {
          state.forinifchecks = [];
        }

        // Push a new for-in-if check onto the stack. The type will be modified
        // when the loop's body is parsed and a suitable if statement exists.
        state.forinifchecks.push({
          type: "(none)"
        });
      }

      state.funct["(breakage)"] += 1;
      state.funct["(loopage)"] += 1;

      s = block(true, true);

      if (nextop.value === "in" && state.option.forin) {
        if (state.forinifchecks && state.forinifchecks.length > 0) {
          var check = state.forinifchecks.pop();

          if (// No if statement or not the first statement in loop body
              s && s.length > 0 && (typeof s[0] !== "object" || s[0].value !== "if") ||
              // Positive if statement is not the only one in loop body
              check.type === "(positive)" && s.length > 1 ||
              // Negative if statement but no continue
              check.type === "(negative)") {
            warning("W089", this);
          }
        }

        // Reset the flag in case no if statement was contained in the loop body
        state.forinifcheckneeded = false;
      }

      state.funct["(breakage)"] -= 1;
      state.funct["(loopage)"] -= 1;
    } else {
      if (foreachtok) {
        error("E045", foreachtok);
      }
      if (state.tokens.next.id !== ";") {
        if (state.tokens.next.id === "var") {
          advance("var");
          state.tokens.curr.fud();
        } else if (state.tokens.next.id === "let") {
          advance("let");
          // create a new block scope
          letscope = true;
          state.funct["(scope)"].stack();
          state.tokens.curr.fud();
        } else {
          for (;;) {
            expression(0, "for");
            if (state.tokens.next.id !== ",") {
              break;
            }
            parseComma();
          }
        }
      }
      nolinebreak(state.tokens.curr);
      advance(";");

      // start loopage after the first ; as the next two expressions are executed
      // on every loop
      state.funct["(loopage)"] += 1;
      if (state.tokens.next.id !== ";") {
        checkCondAssignment(expression(0));
      }
      nolinebreak(state.tokens.curr);
      advance(";");
      if (state.tokens.next.id === ";") {
        error("E021", state.tokens.next, ")", ";");
      }
      if (state.tokens.next.id !== ")") {
        for (;;) {
          expression(0, "for");
          if (state.tokens.next.id !== ",") {
            break;
          }
          parseComma();
        }
      }
      advance(")", t);
      state.funct["(breakage)"] += 1;
      block(true, true);
      state.funct["(breakage)"] -= 1;
      state.funct["(loopage)"] -= 1;

    }
    // unstack loop blockscope
    if (letscope) {
      state.funct["(scope)"].unstack();
    }
    return this;
  }).labelled = true;


  stmt("break", function() {
    var v = state.tokens.next.value;

    if (!state.option.asi)
      nolinebreak(this);

    if (state.tokens.next.id !== ";" && !state.tokens.next.reach &&
        state.tokens.curr.line === startLine(state.tokens.next)) {
      if (!state.funct["(scope)"].funct.hasBreakLabel(v)) {
        warning("W090", state.tokens.next, v);
      }
      this.first = state.tokens.next;
      advance();
    } else {
      if (state.funct["(breakage)"] === 0)
        warning("W052", state.tokens.next, this.value);
    }

    reachable(this);

    return this;
  }).exps = true;


  stmt("continue", function() {
    var v = state.tokens.next.value;

    if (state.funct["(breakage)"] === 0)
      warning("W052", state.tokens.next, this.value);
    if (!state.funct["(loopage)"])
      warning("W052", state.tokens.next, this.value);

    if (!state.option.asi)
      nolinebreak(this);

    if (state.tokens.next.id !== ";" && !state.tokens.next.reach) {
      if (state.tokens.curr.line === startLine(state.tokens.next)) {
        if (!state.funct["(scope)"].funct.hasBreakLabel(v)) {
          warning("W090", state.tokens.next, v);
        }
        this.first = state.tokens.next;
        advance();
      }
    }

    reachable(this);

    return this;
  }).exps = true;


  stmt("return", function() {
    if (this.line === startLine(state.tokens.next)) {
      if (state.tokens.next.id !== ";" && !state.tokens.next.reach) {
        this.first = expression(0);

        if (this.first &&
            this.first.type === "(punctuator)" && this.first.value === "=" &&
            !this.first.paren && !state.option.boss) {
          warningAt("W093", this.first.line, this.first.character);
        }
      }
    } else {
      if (state.tokens.next.type === "(punctuator)" &&
        ["[", "{", "+", "-"].indexOf(state.tokens.next.value) > -1) {
        nolinebreak(this); // always warn (Line breaking error)
      }
    }

    reachable(this);

    return this;
  }).exps = true;

  (function(x) {
    x.exps = true;
    x.lbp = 25;
  }(prefix("yield", function() {
    var prev = state.tokens.prev;
    if (state.inES6(true) && !state.funct["(generator)"]) {
      // If it's a yield within a catch clause inside a generator then that's ok
      if (!("(catch)" === state.funct["(name)"] && state.funct["(context)"]["(generator)"])) {
        error("E046", state.tokens.curr, "yield");
      }
    } else if (!state.inES6()) {
      warning("W104", state.tokens.curr, "yield", "6");
    }
    state.funct["(generator)"] = "yielded";
    var delegatingYield = false;

    if (state.tokens.next.value === "*") {
      delegatingYield = true;
      advance("*");
    }

    if (this.line === startLine(state.tokens.next) || !state.inMoz()) {
      if (delegatingYield ||
          (state.tokens.next.id !== ";" && !state.option.asi &&
           !state.tokens.next.reach && state.tokens.next.nud)) {

        nobreaknonadjacent(state.tokens.curr, state.tokens.next);
        this.first = expression(10);

        if (this.first.type === "(punctuator)" && this.first.value === "=" &&
            !this.first.paren && !state.option.boss) {
          warningAt("W093", this.first.line, this.first.character);
        }
      }

      if (state.inMoz() && state.tokens.next.id !== ")" &&
          (prev.lbp > 30 || (!prev.assign && !isEndOfExpr()) || prev.id === "yield")) {
        error("E050", this);
      }
    } else if (!state.option.asi) {
      nolinebreak(this); // always warn (Line breaking error)
    }
    return this;
  })));


  stmt("throw", function() {
    nolinebreak(this);
    this.first = expression(20);

    reachable(this);

    return this;
  }).exps = true;

  stmt("import", function() {
    if (!state.inES6()) {
      warning("W119", state.tokens.curr, "import", "6");
    }

    if (state.tokens.next.type === "(string)") {
      // ModuleSpecifier :: StringLiteral
      advance("(string)");
      return this;
    }

    if (state.tokens.next.identifier) {
      // ImportClause :: ImportedDefaultBinding
      this.name = identifier();
      // Import bindings are immutable (see ES6 8.1.1.5.5)
      state.funct["(scope)"].addlabel(this.name, {
        type: "const",
        token: state.tokens.curr });

      if (state.tokens.next.value === ",") {
        // ImportClause :: ImportedDefaultBinding , NameSpaceImport
        // ImportClause :: ImportedDefaultBinding , NamedImports
        advance(",");
        // At this point, we intentionally fall through to continue matching
        // either NameSpaceImport or NamedImports.
        // Discussion:
        // https://github.com/jshint/jshint/pull/2144#discussion_r23978406
      } else {
        advance("from");
        advance("(string)");
        return this;
      }
    }

    if (state.tokens.next.id === "*") {
      // ImportClause :: NameSpaceImport
      advance("*");
      advance("as");
      if (state.tokens.next.identifier) {
        this.name = identifier();
        // Import bindings are immutable (see ES6 8.1.1.5.5)
        state.funct["(scope)"].addlabel(this.name, {
          type: "const",
          token: state.tokens.curr });
      }
    } else {
      // ImportClause :: NamedImports
      advance("{");
      for (;;) {
        if (state.tokens.next.value === "}") {
          advance("}");
          break;
        }
        var importName;
        if (state.tokens.next.type === "default") {
          importName = "default";
          advance("default");
        } else {
          importName = identifier();
        }
        if (state.tokens.next.value === "as") {
          advance("as");
          importName = identifier();
        }

        // Import bindings are immutable (see ES6 8.1.1.5.5)
        state.funct["(scope)"].addlabel(importName, {
          type: "const",
          token: state.tokens.curr });

        if (state.tokens.next.value === ",") {
          advance(",");
        } else if (state.tokens.next.value === "}") {
          advance("}");
          break;
        } else {
          error("E024", state.tokens.next, state.tokens.next.value);
          break;
        }
      }
    }

    // FromClause
    advance("from");
    advance("(string)");
    return this;
  }).exps = true;

  stmt("export", function() {
    var ok = true;
    var token;
    var identifier;

    if (!state.inES6()) {
      warning("W119", state.tokens.curr, "export", "6");
      ok = false;
    }

    if (!state.funct["(scope)"].block.isGlobal()) {
      error("E053", state.tokens.curr);
      ok = false;
    }

    if (state.tokens.next.value === "*") {
      // ExportDeclaration :: export * FromClause
      advance("*");
      advance("from");
      advance("(string)");
      return this;
    }

    if (state.tokens.next.type === "default") {
      // ExportDeclaration ::
      //      export default [lookahead  { function, class }] AssignmentExpression[In] ;
      //      export default HoistableDeclaration
      //      export default ClassDeclaration
      state.nameStack.set(state.tokens.next);
      advance("default");
      var exportType = state.tokens.next.id;
      if (exportType === "function" || exportType === "class") {
        this.block = true;
      }

      token = peek();

      expression(10);

      identifier = token.value;

      if (this.block) {
        state.funct["(scope)"].addlabel(identifier, {
          type: exportType,
          token: token });

        state.funct["(scope)"].setExported(identifier, token);
      }

      return this;
    }

    if (state.tokens.next.value === "{") {
      // ExportDeclaration :: export ExportClause
      advance("{");
      var exportedTokens = [];
      for (;;) {
        if (!state.tokens.next.identifier) {
          error("E030", state.tokens.next, state.tokens.next.value);
        }
        advance();

        exportedTokens.push(state.tokens.curr);

        if (state.tokens.next.value === "as") {
          advance("as");
          if (!state.tokens.next.identifier) {
            error("E030", state.tokens.next, state.tokens.next.value);
          }
          advance();
        }

        if (state.tokens.next.value === ",") {
          advance(",");
        } else if (state.tokens.next.value === "}") {
          advance("}");
          break;
        } else {
          error("E024", state.tokens.next, state.tokens.next.value);
          break;
        }
      }
      if (state.tokens.next.value === "from") {
        // ExportDeclaration :: export ExportClause FromClause
        advance("from");
        advance("(string)");
      } else if (ok) {
        exportedTokens.forEach(function(token) {
          state.funct["(scope)"].setExported(token.value, token);
        });
      }
      return this;
    }

    if (state.tokens.next.id === "var") {
      // ExportDeclaration :: export VariableStatement
      advance("var");
      state.tokens.curr.fud({ inexport:true });
    } else if (state.tokens.next.id === "let") {
      // ExportDeclaration :: export VariableStatement
      advance("let");
      state.tokens.curr.fud({ inexport:true });
    } else if (state.tokens.next.id === "const") {
      // ExportDeclaration :: export VariableStatement
      advance("const");
      state.tokens.curr.fud({ inexport:true });
    } else if (state.tokens.next.id === "function") {
      // ExportDeclaration :: export Declaration
      this.block = true;
      advance("function");
      state.syntax["function"].fud({ inexport:true });
    } else if (state.tokens.next.id === "class") {
      // ExportDeclaration :: export Declaration
      this.block = true;
      advance("class");
      var classNameToken = state.tokens.next;
      state.syntax["class"].fud();
      state.funct["(scope)"].setExported(classNameToken.value, classNameToken);
    } else {
      error("E024", state.tokens.next, state.tokens.next.value);
    }

    return this;
  }).exps = true;

  // Future Reserved Words

  FutureReservedWord("abstract");
  FutureReservedWord("await", { es5: true, moduleOnly: true });
  FutureReservedWord("boolean");
  FutureReservedWord("byte");
  FutureReservedWord("char");
  FutureReservedWord("class", { es5: true, nud: classdef });
  FutureReservedWord("double");
  FutureReservedWord("enum", { es5: true });
  FutureReservedWord("export", { es5: true });
  FutureReservedWord("extends", { es5: true });
  FutureReservedWord("final");
  FutureReservedWord("float");
  FutureReservedWord("goto");
  FutureReservedWord("implements", { es5: true, strictOnly: true });
  FutureReservedWord("import", { es5: true });
  FutureReservedWord("int");
  FutureReservedWord("interface", { es5: true, strictOnly: true });
  FutureReservedWord("long");
  FutureReservedWord("native");
  FutureReservedWord("package", { es5: true, strictOnly: true });
  FutureReservedWord("private", { es5: true, strictOnly: true });
  FutureReservedWord("protected", { es5: true, strictOnly: true });
  FutureReservedWord("public", { es5: true, strictOnly: true });
  FutureReservedWord("short");
  FutureReservedWord("static", { es5: true, strictOnly: true });
  FutureReservedWord("super", { es5: true });
  FutureReservedWord("synchronized");
  FutureReservedWord("transient");
  FutureReservedWord("volatile");

  // this function is used to determine whether a squarebracket or a curlybracket
  // expression is a comprehension array, destructuring assignment or a json value.

  var lookupBlockType = function() {
    var pn, pn1, prev;
    var i = -1;
    var bracketStack = 0;
    var ret = {};
    if (checkPunctuators(state.tokens.curr, ["[", "{"])) {
      bracketStack += 1;
    }
    do {
      prev = i === -1 ? state.tokens.curr : pn;
      pn = i === -1 ? state.tokens.next : peek(i);
      pn1 = peek(i + 1);
      i = i + 1;
      if (checkPunctuators(pn, ["[", "{"])) {
        bracketStack += 1;
      } else if (checkPunctuators(pn, ["]", "}"])) {
        bracketStack -= 1;
      }
      if (bracketStack === 1 && pn.identifier && pn.value === "for" &&
          !checkPunctuator(prev, ".")) {
        ret.isCompArray = true;
        ret.notJson = true;
        break;
      }
      if (bracketStack === 0 && checkPunctuators(pn, ["}", "]"])) {
        if (pn1.value === "=") {
          ret.isDestAssign = true;
          ret.notJson = true;
          break;
        } else if (pn1.value === ".") {
          ret.notJson = true;
          break;
        }
      }
      if (checkPunctuator(pn, ";")) {
        ret.isBlock = true;
        ret.notJson = true;
      }
    } while (bracketStack > 0 && pn.id !== "(end)");
    return ret;
  };

  function saveProperty(props, name, tkn, isClass, isStatic) {
    var msg = ["key", "class method", "static class method"];
    msg = msg[(isClass || false) + (isStatic || false)];
    if (tkn.identifier) {
      name = tkn.value;
    }

    if (props[name] && name !== "__proto__") {
      warning("W075", state.tokens.next, msg, name);
    } else {
      props[name] = Object.create(null);
    }

    props[name].basic = true;
    props[name].basictkn = tkn;
  }

  /**
   * @param {string} accessorType - Either "get" or "set"
   * @param {object} props - a collection of all properties of the object to
   *                         which the current accessor is being assigned
   * @param {object} tkn - the identifier token representing the accessor name
   * @param {boolean} isClass - whether the accessor is part of an ES6 Class
   *                            definition
   * @param {boolean} isStatic - whether the accessor is a static method
   */
  function saveAccessor(accessorType, props, name, tkn, isClass, isStatic) {
    var flagName = accessorType === "get" ? "getterToken" : "setterToken";
    var msg = "";

    if (isClass) {
      if (isStatic) {
        msg += "static ";
      }
      msg += accessorType + "ter method";
    } else {
      msg = "key";
    }

    state.tokens.curr.accessorType = accessorType;
    state.nameStack.set(tkn);

    if (props[name]) {
      if ((props[name].basic || props[name][flagName]) && name !== "__proto__") {
        warning("W075", state.tokens.next, msg, name);
      }
    } else {
      props[name] = Object.create(null);
    }

    props[name][flagName] = tkn;
  }

  function computedPropertyName() {
    advance("[");
    if (!state.inES6()) {
      warning("W119", state.tokens.curr, "computed property names", "6");
    }
    var value = expression(10);
    advance("]");
    return value;
  }

  /**
   * Test whether a given token is a punctuator matching one of the specified values
   * @param {Token} token
   * @param {Array.<string>} values
   * @returns {boolean}
   */
  function checkPunctuators(token, values) {
    if (token.type === "(punctuator)") {
      return _.contains(values, token.value);
    }
    return false;
  }

  /**
   * Test whether a given token is a punctuator matching the specified value
   * @param {Token} token
   * @param {string} value
   * @returns {boolean}
   */
  function checkPunctuator(token, value) {
    return token.type === "(punctuator)" && token.value === value;
  }

  // Check whether this function has been reached for a destructuring assign with undeclared values
  function destructuringAssignOrJsonValue() {
    // lookup for the assignment (ECMAScript 6 only)
    // if it has semicolons, it is a block, so go parse it as a block
    // or it's not a block, but there are assignments, check for undeclared variables

    var block = lookupBlockType();
    if (block.notJson) {
      if (!state.inES6() && block.isDestAssign) {
        warning("W104", state.tokens.curr, "destructuring assignment", "6");
      }
      statements();
    // otherwise parse json value
    } else {
      state.option.laxbreak = true;
      state.jsonMode = true;
      jsonValue();
    }
  }

  // array comprehension parsing function
  // parses and defines the three states of the list comprehension in order
  // to avoid defining global variables, but keeping them to the list comprehension scope
  // only. The order of the states are as follows:
  //  * "use" which will be the returned iterative part of the list comprehension
  //  * "define" which will define the variables local to the list comprehension
  //  * "filter" which will help filter out values

  var arrayComprehension = function() {
    var CompArray = function() {
      this.mode = "use";
      this.variables = [];
    };
    var _carrays = [];
    var _current;
    function declare(v) {
      var l = _current.variables.filter(function(elt) {
        // if it has, change its undef state
        if (elt.value === v) {
          elt.undef = false;
          return v;
        }
      }).length;
      return l !== 0;
    }
    function use(v) {
      var l = _current.variables.filter(function(elt) {
        // and if it has been defined
        if (elt.value === v && !elt.undef) {
          if (elt.unused === true) {
            elt.unused = false;
          }
          return v;
        }
      }).length;
      // otherwise we warn about it
      return (l === 0);
    }
    return { stack: function() {
          _current = new CompArray();
          _carrays.push(_current);
        },
        unstack: function() {
          _current.variables.filter(function(v) {
            if (v.unused)
              warning("W098", v.token, v.raw_text || v.value);
            if (v.undef)
              state.funct["(scope)"].block.use(v.value, v.token);
          });
          _carrays.splice(-1, 1);
          _current = _carrays[_carrays.length - 1];
        },
        setState: function(s) {
          if (_.contains(["use", "define", "generate", "filter"], s))
            _current.mode = s;
        },
        check: function(v) {
          if (!_current) {
            return;
          }
          // When we are in "use" state of the list comp, we enqueue that var
          if (_current && _current.mode === "use") {
            if (use(v)) {
              _current.variables.push({
                funct: state.funct,
                token: state.tokens.curr,
                value: v,
                undef: true,
                unused: false
              });
            }
            return true;
          // When we are in "define" state of the list comp,
          } else if (_current && _current.mode === "define") {
            // check if the variable has been used previously
            if (!declare(v)) {
              _current.variables.push({
                funct: state.funct,
                token: state.tokens.curr,
                value: v,
                undef: false,
                unused: true
              });
            }
            return true;
          // When we are in the "generate" state of the list comp,
          } else if (_current && _current.mode === "generate") {
            state.funct["(scope)"].block.use(v, state.tokens.curr);
            return true;
          // When we are in "filter" state,
          } else if (_current && _current.mode === "filter") {
            // we check whether current variable has been declared
            if (use(v)) {
              // if not we warn about it
              state.funct["(scope)"].block.use(v, state.tokens.curr);
            }
            return true;
          }
          return false;
        }
        };
  };


  // Parse JSON

  function jsonValue() {
    function jsonObject() {
      var o = {}, t = state.tokens.next;
      advance("{");
      if (state.tokens.next.id !== "}") {
        for (;;) {
          if (state.tokens.next.id === "(end)") {
            error("E026", state.tokens.next, t.line);
          } else if (state.tokens.next.id === "}") {
            warning("W094", state.tokens.curr);
            break;
          } else if (state.tokens.next.id === ",") {
            error("E028", state.tokens.next);
          } else if (state.tokens.next.id !== "(string)") {
            warning("W095", state.tokens.next, state.tokens.next.value);
          }
          if (o[state.tokens.next.value] === true) {
            warning("W075", state.tokens.next, "key", state.tokens.next.value);
          } else if ((state.tokens.next.value === "__proto__" &&
            !state.option.proto) || (state.tokens.next.value === "__iterator__" &&
            !state.option.iterator)) {
            warning("W096", state.tokens.next, state.tokens.next.value);
          } else {
            o[state.tokens.next.value] = true;
          }
          advance();
          advance(":");
          jsonValue();
          if (state.tokens.next.id !== ",") {
            break;
          }
          advance(",");
        }
      }
      advance("}");
    }

    function jsonArray() {
      var t = state.tokens.next;
      advance("[");
      if (state.tokens.next.id !== "]") {
        for (;;) {
          if (state.tokens.next.id === "(end)") {
            error("E027", state.tokens.next, t.line);
          } else if (state.tokens.next.id === "]") {
            warning("W094", state.tokens.curr);
            break;
          } else if (state.tokens.next.id === ",") {
            error("E028", state.tokens.next);
          }
          jsonValue();
          if (state.tokens.next.id !== ",") {
            break;
          }
          advance(",");
        }
      }
      advance("]");
    }

    switch (state.tokens.next.id) {
    case "{":
      jsonObject();
      break;
    case "[":
      jsonArray();
      break;
    case "true":
    case "false":
    case "null":
    case "(number)":
    case "(string)":
      advance();
      break;
    case "-":
      advance("-");
      advance("(number)");
      break;
    default:
      error("E003", state.tokens.next);
    }
  }

  var escapeRegex = function(str) {
    return str.replace(/[-\/\\^$*+?.()|[\]{}]/g, "\\$&");
  };

  // The actual JSHINT function itself.
  var itself = function(s, o, g) {
    var i, k, x, reIgnoreStr, reIgnore;
    var optionKeys;
    var newOptionObj = {};
    var newIgnoredObj = {};

    o = _.clone(o);
    state.reset();

    if (o && o.scope) {
      JSHINT.scope = o.scope;
    } else {
      JSHINT.errors = [];
      JSHINT.undefs = [];
      JSHINT.internals = [];
      JSHINT.blacklist = {};
      JSHINT.scope = "(main)";
    }

    predefined = Object.create(null);
    combine(predefined, vars.ecmaIdentifiers[3]);
    combine(predefined, vars.reservedVars);

    combine(predefined, g || {});

    declared = Object.create(null);
    var exported = Object.create(null); // Variables that live outside the current file

    function each(obj, cb) {
      if (!obj)
        return;

      if (!Array.isArray(obj) && typeof obj === "object")
        obj = Object.keys(obj);

      obj.forEach(cb);
    }

    if (o) {
      each(o.predef || null, function(item) {
        var slice, prop;

        if (item[0] === "-") {
          slice = item.slice(1);
          JSHINT.blacklist[slice] = slice;
          // remove from predefined if there
          delete predefined[slice];
        } else {
          prop = Object.getOwnPropertyDescriptor(o.predef, item);
          predefined[item] = prop ? prop.value : false;
        }
      });

      each(o.exported || null, function(item) {
        exported[item] = true;
      });

      delete o.predef;
      delete o.exported;

      optionKeys = Object.keys(o);
      for (x = 0; x < optionKeys.length; x++) {
        if (/^-W\d{3}$/g.test(optionKeys[x])) {
          newIgnoredObj[optionKeys[x].slice(1)] = true;
        } else {
          var optionKey = optionKeys[x];
          newOptionObj[optionKey] = o[optionKey];
        }
      }
    }

    state.option = newOptionObj;
    state.ignored = newIgnoredObj;

    state.option.indent = state.option.indent || 4;
    state.option.maxerr = state.option.maxerr || 50;

    indent = 1;

    var scopeManagerInst = scopeManager(state, predefined, exported, declared);
    scopeManagerInst.on("warning", function(ev) {
      warning.apply(null, [ ev.code, ev.token].concat(ev.data));
    });

    scopeManagerInst.on("error", function(ev) {
      error.apply(null, [ ev.code, ev.token ].concat(ev.data));
    });

    state.funct = functor("(global)", null, {
      "(global)"    : true,
      "(scope)"     : scopeManagerInst,
      "(comparray)" : arrayComprehension(),
      "(metrics)"   : createMetrics(state.tokens.next)
    });

    functions = [state.funct];
    urls = [];
    stack = null;
    member = {};
    membersOnly = null;
    inblock = false;
    lookahead = [];

    if (!isString(s) && !Array.isArray(s)) {
      errorAt("E004", 0);
      return false;
    }

    api = {
      get isJSON() {
        return state.jsonMode;
      },

      getOption: function(name) {
        return state.option[name] || null;
      },

      getCache: function(name) {
        return state.cache[name];
      },

      setCache: function(name, value) {
        state.cache[name] = value;
      },

      warn: function(code, data) {
        warningAt.apply(null, [ code, data.line, data.char ].concat(data.data));
      },

      on: function(names, listener) {
        names.split(" ").forEach(function(name) {
          emitter.on(name, listener);
        }.bind(this));
      }
    };

    emitter.removeAllListeners();
    (extraModules || []).forEach(function(func) {
      func(api);
    });

    state.tokens.prev = state.tokens.curr = state.tokens.next = state.syntax["(begin)"];

    if (o && o.ignoreDelimiters) {

      if (!Array.isArray(o.ignoreDelimiters)) {
        o.ignoreDelimiters = [o.ignoreDelimiters];
      }

      o.ignoreDelimiters.forEach(function(delimiterPair) {
        if (!delimiterPair.start || !delimiterPair.end)
            return;

        reIgnoreStr = escapeRegex(delimiterPair.start) +
                      "[\\s\\S]*?" +
                      escapeRegex(delimiterPair.end);

        reIgnore = new RegExp(reIgnoreStr, "ig");

        s = s.replace(reIgnore, function(match) {
          return match.replace(/./g, " ");
        });
      });
    }

    lex = new Lexer(s);

    lex.on("warning", function(ev) {
      warningAt.apply(null, [ ev.code, ev.line, ev.character].concat(ev.data));
    });

    lex.on("error", function(ev) {
      errorAt.apply(null, [ ev.code, ev.line, ev.character ].concat(ev.data));
    });

    lex.on("fatal", function(ev) {
      quit("E041", ev);
    });

    lex.on("Identifier", function(ev) {
      emitter.emit("Identifier", ev);
    });

    lex.on("String", function(ev) {
      emitter.emit("String", ev);
    });

    lex.on("Number", function(ev) {
      emitter.emit("Number", ev);
    });

    lex.start();

    // Check options
    for (var name in o) {
      if (_.has(o, name)) {
        checkOption(name, state.tokens.curr);
      }
    }

    try {
      assume();

      // combine the passed globals after we've assumed all our options
      combine(predefined, g || {});

      //reset values
      parseComma.first = true;

      advance();
      switch (state.tokens.next.id) {
      case "{":
      case "[":
        destructuringAssignOrJsonValue();
        break;
      default:
        directives();

        if (state.directive["use strict"]) {
          if (!state.allowsGlobalUsd()) {
            warning("W097", state.tokens.prev);
          }
        }

        statements();
      }

      if (state.tokens.next.id !== "(end)") {
        quit("E041", state.tokens.curr);
      }

      state.funct["(scope)"].unstack();

    } catch (err) {
      if (err && err.name === "JSHintError") {
        var nt = state.tokens.next || {};
        JSHINT.errors.push({
          scope     : "(main)",
          raw       : err.raw,
          code      : err.code,
          reason    : err.reason,
          line      : err.line || nt.line,
          character : err.character || nt.from
        }, null);
      } else {
        throw err;
      }
    }

    // Loop over the listed "internals", and check them as well.

    if (JSHINT.scope === "(main)") {
      o = o || {};

      for (i = 0; i < JSHINT.internals.length; i += 1) {
        k = JSHINT.internals[i];
        o.scope = k.elem;
        itself(k.value, o, g);
      }
    }

    return JSHINT.errors.length === 0;
  };

  // Modules.
  itself.addModule = function(func) {
    extraModules.push(func);
  };

  itself.addModule(style.register);

  // Data summary.
  itself.data = function() {
    var data = {
      functions: [],
      options: state.option
    };

    var fu, f, i, j, n, globals;

    if (itself.errors.length) {
      data.errors = itself.errors;
    }

    if (state.jsonMode) {
      data.json = true;
    }

    var impliedGlobals = state.funct["(scope)"].getImpliedGlobals();
    if (impliedGlobals.length > 0) {
      data.implieds = impliedGlobals;
    }

    if (urls.length > 0) {
      data.urls = urls;
    }

    globals = state.funct["(scope)"].getUsedOrDefinedGlobals();
    if (globals.length > 0) {
      data.globals = globals;
    }

    for (i = 1; i < functions.length; i += 1) {
      f = functions[i];
      fu = {};

      for (j = 0; j < functionicity.length; j += 1) {
        fu[functionicity[j]] = [];
      }

      for (j = 0; j < functionicity.length; j += 1) {
        if (fu[functionicity[j]].length === 0) {
          delete fu[functionicity[j]];
        }
      }

      fu.name = f["(name)"];
      fu.param = f["(params)"];
      fu.line = f["(line)"];
      fu.character = f["(character)"];
      fu.last = f["(last)"];
      fu.lastcharacter = f["(lastcharacter)"];

      fu.metrics = {
        complexity: f["(metrics)"].ComplexityCount,
        parameters: f["(metrics)"].arity,
        statements: f["(metrics)"].statementCount
      };

      data.functions.push(fu);
    }

    var unuseds = state.funct["(scope)"].getUnuseds();
    if (unuseds.length > 0) {
      data.unused = unuseds;
    }

    for (n in member) {
      if (typeof member[n] === "number") {
        data.member = member;
        break;
      }
    }

    return data;
  };

  itself.jshint = itself;

  return itself;
}());

// Make JSHINT a Node module, if possible.
if (typeof exports === "object" && exports) {
  exports.JSHINT = JSHINT;
}

},{"./lex.js":13,"./messages.js":14,"./options.js":16,"./reg.js":17,"./scope-manager.js":18,"./state.js":19,"./style.js":20,"./vars.js":21,"console-browserify":10,"events":5,"lodash":12}]},{},[]);

JSHINT = require('jshint').JSHINT;
if (typeof exports === 'object' && exports) exports.JSHINT = JSHINT;
}());
