enumerate

main.rs

fn main() {
    let vec = vec!["f", "o", "o"];
    // instead of this
    for i in 0..vec.len() {
        println!("The character at {i} is {}", vec[i]);
    }
    // you can use this
    for (i, char) in vec.iter().enumerate() {
        println!("The character at {i} is {char}");
    }
}