Generic largest in Rust

A generic function with a trait bound, which is Rust's whole approach to polymorphism in miniature.

fn largest<T: PartialOrd>(items: &[T]) -> Option<&T> {
    let mut iter = items.iter();
    let mut best = iter.next()?;
    for item in iter {
        if item > best {
            best = item;
        }
    }
    Some(best)
}

Keywords and builtins used here

• Option
• PartialOrd
• Some
• fn
• for
• if
• in
• largest
• let
• mut

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Step 2 of 4 in Generics, step 5 of 19 in Traits & generics.

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