ajaxlinux1234

``` function formatNum(num){ const arr = `${num}`.split(''); return arr.reduceRight((pre, cur, rightIndex) => { const index = arr.length-1 - rightIndex; if ((index+1)%3 !== 0 || index === arr.length -1 ) {...

``` const getString = arr => { const minLen = Math.min(...arr.map(item=>(item.length))); let str = ""; for(let i=0;i(item[i] === strItem))){ str = `${str}${strItem}` } } return str } ```