var baseMerge = require('./internal/baseMerge'),
    createAssigner = require('./internal/createAssigner');

/**
 * Recursively merges own and inherited enumerable properties of source
 * objects into the destination object, skipping source properties that resolve
 * to `undefined`. Array and plain object properties are merged recursively.
 * Other objects and value types are overridden by assignment. Source objects
 * are applied from left to right. Subsequent sources overwrite property
 * assignments of previous sources.
 *
 * **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
 *
 * 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 }] }
 */
var merge = createAssigner(function(object, source) {
  baseMerge(object, source);
});

module.exports = merge;
