A generic method with a constraint in C#
C# interview exercise on Async & 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<T>(items) that works for any value type that can be compared with itself: ints, doubles, chars. Return null for an empty sequence. The constraint `where T : struct, IComparable<T>` is what allows both CompareTo and the T? return type.
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.