Rust Vectors.

main.rs

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

    let mut iter = v.into_iter();

    let n = iter.next();
    println!("{:?}", n.unwrap());

    let n = iter.next();
    println!("{:?}", n.unwrap());

    let n = iter.next();
    println!("{:?}", n.unwrap());

    // This return a Panic because the isn't a Value but "None"
    // let n = iter.next();
    // println!("{:?}", n.unwrap());
    //

    // This could be a solution, but is not enough
    let n = iter.next();
    println!("{:?}", n.unwrap_or(0));

    // A better approach could be match the result
    // and then perform custom actions.

    let n = iter.next();
    print_vec_val(n);
}

// This could be a better approach to avoid unwrap panics

fn print_vec_val(val: Option<i32>) {
    match val {
        Some(value) => println!("{:?}", value),
        None => println!("No Values!"),
    }
}

//The best solution IMO is not use a next() function to iterate vectors :)