FlyTeng
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FlyTeng
trafficstars
```js function convert(str) { str = (str).toString() if (str) return convert(str.substr(1)) + str.substr(0, 1) return '' } convert(12345) ```
```js var arr=[0,1,0,3,12]; for (let i = 0; i< arr.length; i++){ arr[i]?'':arr=arr.concat(arr.splice(i,1)) } console.log(arr) ```
```js 'aBcD'.split('').map((item,i)=>{ return /[a-z]/.test(item)?item.toUpperCase():item.toLowerCase() }).join('') ```