Javascript square all element in array not working

Question

function square(arr) {
   var result=[].concat(arr);
   result.forEach(function(i){
      i=i*i;
      console.log(i);
   })
   return result;
 }
var arr=[1,2,3,4];
cons         


        

Answer 1

forEach is iterating the array but it is not returning anyvvalue.Use map function which will return a new array with updated result

function square(arr) {
  return arr.map(function(i) {
    return i * i;
  })

}
var arr = [1, 2, 3, 4];
console.log(square(arr))

If you still intend to use forEach push the updated values in an array and return that array