Creating and Using Vectors in Rust

Snippet

Creating and Using Vectors in Rust

Vectors are growable arrays stored on the heap. The vec! macro creates a vector with initial values. You can transform vectors using iterator methods like map() and filter(), which are lazy and only execute when collected().

snippet.rs
rust
fn main() {
    let numbers: Vec<i32> = vec![1, 2, 3];
    let doubled: Vec<i32> = numbers.iter().map(|x| x * 2).collect();
    let filtered: Vec<i32> = numbers.iter().filter(|x| x % 3 == 0).collect();
    println!("Doubled: {:?}", doubled);
    println!("Divisible by 3: {:?}", filtered);
}

Breakdown

let numbers: Vec<i32> = vec![1, 2, 3];

Creates a vector of integers using the vec! macro

.iter().map(|x| x * 2)

Iterates over elements and transforms each by multiplying by 2

.collect()

Executes the lazy iterator chain and collects results into a new vector

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Creating and Using Vectors in Rust

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