function square(arr) { //for //let res=arr; //for(let i=0;i<arr.length;i++){ // res[i]=Math.pow(arr[i],2) //} //for of //let res=[] //for(let num of arr){ // res.push(Math.pow(num,2)) //} //return res; //forEach //let res=[] //arr.forEach(num=>{ // res.push(Math.pow(num,2)) //}) //return res; ...