Project Euler - largest palindrome

largestPalindrome.js

function largestPalindrome(lowNum, highNum) {
  var max = 0;
  for (var i = highNum; i >= lowNum; i--) {
    for (var j = i; j >= lowNum; j--) {
      var mul = j * i;
      if (isPalindrome(mul) && mul > max) {
        max = i * j;
      }
    }
  }

  return max;
}

function isPalindrome(i) {
  i = '' + i;
  return i === i.split("").reverse().join("");
}

console.log(largestPalindrome(100,999));