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function palindrome(str) {
  var clrd = str.replace(/[^0-9a-z]/gi, "").toLowerCase();
  var clrdBack = clrd.split("");
      clrdBack = clrdBack.reverse().join("");
  var stringCompare = clrd.localeCompare(clrdBack);

  if (stringCompare === 0) {
      return true;
  }
  return false;
}