11. Concat

[astak16]

题目

题目链接：Concat

实现 Concat ，它接收两个参数，两个参数的类型都是数组，将两个数组进行连接，并返回它。

import type { Equal, Expect } from "@type-challenges/utils";

type cases = [
  Expect<Equal<Concat<[], []>, []>>,
  Expect<Equal<Concat<[], [1]>, [1]>>,
  Expect<Equal<Concat<[1, 2], [3, 4]>, [1, 2, 3, 4]>>,
  Expect<
    Equal<
      Concat<["1", 2, "3"], [false, boolean, "4"]>,
      ["1", 2, "3", false, boolean, "4"]
    >
  >
];

答案

方法一

type Concat<T extends readonly unknown[], F extends readonly unknown[]> = [
  ...T,
  ...U
];