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                                            YANG

第 11 题：将数组扁平化并去除其中重复数据，最终得到一个升序且不重复的数组

```js var arr = [ [1, 2, 2], [3, 4, 5, 5], [6, 7, 8, 9, [11, 12, [12, 13, [14] ] ] ], 10]; function flattern(arg){ if(!Array.isArray(arg)) return false;...

【Q659】在 React Hooks 中实现 usePreviouseValue 取上次渲染的值

```ts import { useRef } from "react"; type ShouldUpdateFunc = (prev: T | undefined, next: T) => boolean; const defalutShouldUpdate = (prev?: T, next?: T) => prev !== next; function...