Square each number in an array in javascript

Question

I\'m trying to square each number in an array and my original code didn\'t work. I looked up another way to do it, but I\'d like to know WHY the original code didn\'t work.<

Answer 1

How about that ?

function (arr) {
  return arr.map(function (x) {
    return Math.pow(x, 2);
  });
}

Array.map(func) applies the function to each element of the map and returns the array composed of the new values. Math.pow(base, exp) raises base to its exp power.