square every digit.js

// Welcome. In this kata, you are asked to square every digit of a number.

// For example, if we run 9119 through the function, 811181 will come out, because 92 is 81 and 12 is 1.

// Note: The function accepts an integer and returns an integer


function squareDigits(num){

    let strNum = ""+num;
    let newNumArr = [];

    [...strNum].forEach(letter => newNumArr.push((letter*letter)));

    return parseInt(newNumArr.join(''));
  }

  squareDigits(9119);