Concept of Mutable Array
To declare the mutable array we use “mut” key. Mutable arrays are those arrays whose elements can be altered. See the example below for a better understanding.
Rust
fn main(){ let mut arr:[i32;5] = [1,2,3,4,5]; arr[1] = 0; println!("{:?}",arr);} |
Output:
[1, 0, 3, 4, 5]
We have updated the value of the array at index number “1” and print the value.
Rust – Array
An Array in Rust programming is a fixed-sized collection of elements denoted by [T; N] where T is the element type and N is the compile-time constant size of the array.
We can create an array in 2 different ways:
- Simply a list with each element [a, b, c].
- Repeat expression [N, X]. This will create an array with N copies of X.
[X,0] It is allowed but can cause some hectic problems so if you are using this type of expression be mindful of side effects. Array size from 0-32 implements the default trait if allowed by its type. Trait implementations are up to 32 sizes. An array is not iterateable itself.
Syntax:
ArrayType : [ Type ; Expression]
An array is written as:
let array: [i32; 3] = [4, 5, 6];
Contact Us