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Core Intermediate

10 Traits & generics

Traits are Rust's interfaces; generics let one function serve many types. Give a trait a default method, then write a generic 'largest'.

Step 2 / 2

Write a generic largest over a non-empty slice.

Hints

Start with the first element as the best, then scan the rest and replace it when you find bigger.
The PartialOrd bound is what lets you write item > best for any T.

10_traits_generics.rs

// largest item of a non-empty slice
fn largest<T: PartialOrd + Copy>(items: &[T]) -> T {
    todo!()
}

// largest item of a non-empty slice
fn largest<T: PartialOrd + Copy>(items: &[T]) -> T {
    todo!()
}

Reset to starterCompiled in a sandbox; hidden checks must pass.

Reveal solution

fn largest<T: PartialOrd + Copy>(items: &[T]) -> T {
    let mut best = items[0];
    for &item in &items[1..] {
        if item > best {
            best = item;
        }
    }
    best
}

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10 Traits & generics