kris-s

    fn add(x: Option<i32>, y: Option<i32>) -> Option<i32> {
        if x.is_none() || y.is_none() {
            return None;
        }
        return Some(x.unwrap() + y.unwrap());
    }
    The above looks kind of clunky because of the none checks it needs to perform, and it also sucks that we have to extract values out of both options and construct a new option out of that. However, we can much better than this thanks to Option’s special properties! Here’s what we could do

    fn add(x: Option<i32>, y: Option<i32>) -> Option<i32> {
        x.zip(y).map(|(a, b)| a+b)
    }