Array types - The Rust Reference

# Array types

> Syntax
> ArrayType :
> `[` Type `;` Expression `]`

An array is a fixed-size sequence of `N` elements of type `T`. The array type is written as `[T; N]`. The size is a constant expression that evaluates to a `usize`.

Examples:

    #![allow(unused)]
    fn main() {
    // A stack-allocated array
    let array: [i32; 3] = [1, 2, 3];

    // A heap-allocated array, coerced to a slice
    let boxed_array: Box<[i32]> = Box::new([1, 2, 3]);
    }

All elements of arrays are always initialized, and access to an array is always bounds-checked in safe methods and operators.

> Note: The `Vec<T>` standard library type provides a heap-allocated resizable array type.