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

Here is the function write with ES6 Exponentiation (**):

let arr = [1, 6, 7, 9];
let result = arr.map(x => x ** 2);
console.log(result);