Generics · medium

26. Basic Mapped Types

Create new types by iterating over keys.

Write `Optional<T>` that makes all keys in `T` optional (reimplement Partial).

Required in your answer: [P in keyof T]?

Transpiled, then run in a sandbox

type MyPartial<T> = { [P in keyof T]?: T[P] };
function test(a: MyPartial<{x:1}>) { return a; }

Output appears here.