Create vector with 0 or 1 elements from an Option

Question

Is there a shorter and simpler way to achieve this:

let o: Option<i32> = ...;
let ve: Vec<i32> = match o {
    None => vec![],
    Some(n) => vec![n],
};

Answer 1

Option implements IntoIterator, so you can make an iterator and collect it:

let ve: Vec<i32> = o.into_iter().collect();

Answer 2

let o: Option<i32> = Some(2);
let ve: Vec<i32> = o.into_iter().collect();

Playground Link