Rust Programming By Example

Arrays

An array is a fixed-size collection of elements of the same type. We declare them with square brackets:

let array = [1, 2, 3, 4];
let array: [i16; 4] = [1, 2, 3, 4];

The second line shows how to specify the type of an array. An alternative way to do that is to use a literal suffix:

let array = [1u8, 2, 3, 4];

A literal suffix is the composition of a literal (that is, a constant) and a type suffix, so with the 1 constant and the u8 type, we get 1u8. Literal suffixes can only be used on numbers. This declares an array of 4 elements of the u8 type. Array indexing starts at 0 and bounds checking is done at runtime. Bounds checking is used to prevent accessing memory that is out of bounds, for instance, trying to access the element after ...