Generic largest in Rust
Rust interview exercise on Traits & Generics, difficulty 2 of 3. Solve it in the editor beside a worked example, or cold in Interview mode with the example hidden; the tests run the moment you do.
Write largest(items) that works for any type that can be compared and copied: integers, floats, chars. Return None for an empty slice. Floats are PartialOrd but not Ord, which is why iter().max() is not available here.
Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Interview mode hides the example: solve it from memory, without the hint or the solution, and it counts as solved cold. Progress is saved in your browser, and in your account if you sign in.