Typescript类型体操 - Flatten

题目

中文

在这个挑战中，你需要写一个接受数组的类型，并且返回扁平化的数组类型。

例如:

type flatten = Flatten<[1, 2, [3, 4], [[[5]]]]> // [1, 2, 3, 4, 5]

English

In this challenge, you would need to write a type that takes an array and emitted the flatten array type.

For example:

type flatten = Flatten<[1, 2, [3, 4], [[[5]]]]> // [1, 2, 3, 4, 5]

答案

type Flatten<T extends any[]> = T extends [infer L, ...infer R]
  ? [...(L extends any[] ? Flatten<L> : [L]), ...Flatten<R>]
  : [];

在线演示

标签：...,Typescript,extends,Flatten,体操,array,type,flatten
来源： https://www.cnblogs.com/laggage/p/16663283.html