Iterator Trait

Iterator trait และ methods

Iterator Basics

fn main() {
    let vec = vec![1, 2, 3, 4, 5];

    // iter() - immutable references
    for x in vec.iter() {
        print!("{} ", x);
    }
    println!();

    // iter_mut() - mutable references
    let mut vec = vec![1, 2, 3];
    for x in vec.iter_mut() {
        *x *= 2;
    }
    println!("Doubled: {:?}", vec);

    // into_iter() - owned values
    let vec = vec![1, 2, 3];
    for x in vec.into_iter() {
        println!("Owned: {}", x);
    }
    // vec is consumed

    // Manual iteration
    let mut iter = [1, 2, 3].iter();
    while let Some(x) = iter.next() {
        println!("Manual: {}", x);
    }
}