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

let arr = [1, 2, 3];
let mapped = arr.map(x => Math.pow(x, 2));
console.log(mapped);