Four-Names

```js let str1 = "hellomasd,asdasdasdan"; let str2 = "asdasdasdan"; let fun = (base, target) => { let conditionLen = base.length - target.length; for (let i = 0; i

```js function flat(target) { let arr = []; target.forEach((element) => { if (Array.isArray(element)) arr.push(...flat(element)); else arr.push(element); }); return arr; } let arr = [1, 2, [3, 4, 5, [6, 7],...

```js let Promise_all = async (Promise_Arr = new Array()) => { let results = [], errors = null; for (let i = 0; i < Promise_Arr.length; i++) { if (Promise_Arr[i]...