Compose functions in C#
C# interview exercise on Delegates & Iterators, 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 Compose(params fns) that returns a function applying fns right to left: Compose(f, g, h)(x) is f(g(h(x))). With no functions it returns its argument unchanged. `params` lets callers pass any number of arguments.
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.