1
var isPalindrome = function (s) {
2
  const toLower = s
3
    .toLowerCase()
4
    .replace(/[\W_\s]+/g, "")
5
    .replace(/ /g, "");
6
  let m = 0;
7
  let n = toLower.length - 1;
8

9
  while (m < n) {
10
    if (toLower[m] !== toLower[n]) {
11
      return false;
12
    }
13
    m++;
14
    n--;
15
  }
16
  return true;
17
};