Exclude

Problem - On Github

Create the inbuilt Exclude type. It takes two parameters - the first is a union type, the second a type or union type to exclude from the initial union type.

Out initial type given by the puzzle creator is

type MyExclude<T, U> = any

Solution

This one is a bit of an easier puzzle. There really is just one thing that needs to be done - and that is to see if T is a part of U, and if it is we want to say it is never instead to exclude it.

type MyExclude<T, U> = T extends U ? never : T;

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