How can I peek into a vector and pop if a condition is met?

Question

I want to retrieve an element from a vector if a condition on that element is true.

fn draw() -> Option {
    let mut v: Vec =         


        

Answer 1

Borrows are lexical, so v has the life-time of the whole function. If one can reduce the scope, one can use last() and pop(). One way to do this is a functional-style map:

let mut v: Vec<String> = vec!["foo".to_string()];
if v.last().map_or(false, check) {
    v.pop()
} else {
    None
}