Maximum

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题目

Description

Implement the type Maximum, which takes an input type T, and returns the maximum value in T.

If T is an empty array, it returns never. Negative numbers are not considered.

For example:

Maximum<[]>; // never
Maximum<[0, 2, 1]>; // 2
Maximum<[1, 20, 200, 150]>; // 200

Advanced

Can you implement type Minimum inspired by Maximum?

解答

// " 1|20|200|150 extends 20 ? never : U " ==>> " 1|200|150 "
type Maximum<
  T extends any[],
  U = T[number],
  N extends any[] = []
> = T extends []
  ? never
  : Equal<U, N["length"]> extends true
  ? U
  : Maximum<T, U extends N["length"] ? never : U, [...N, unknown]>;