Rustling Optional

27 Aug 2022

Optional Value stacking

   let mut optional_integers_vec: Vec<Option<i8>> = Vec::new();
    for x in 1..10 {
        optional_integers_vec.push(Some(x));
    }

    // TODO: make this a while let statement - remember that vector.pop also adds another layer of Option<T>
    // You can stack `Option<T>`'s into while let and if let
    while let Some(Some(integer)) = optional_integers_vec.pop() {
        println!("current value: {}", integer);
    }

Keyword ref

struct Point {
    x: i32,
    y: i32,
}

fn main() {
    let y: Option<Point> = Some(Point { x: 100, y: 200 });

    match y {
        Some(ref p) => println!("Co-ordinates are {},{} ", p.x, p.y),
        _ => println!("no match"),
    }
    y; // Fix without deleting this line.
}