How to write palindrome in JavaScript

Question

I wonder how to write palindrome in javascript, where I input different words and program shows if word is palindrome or not. For example word noon is palindrome, while bad

Answer 1

str1 is the original string with deleted non-alphanumeric characters and spaces and str2 is the original string reversed.

function palindrome(str) {

  var str1 = str.toLowerCase().replace(/\s/g, '').replace(
    /[^a-zA-Z 0-9]/gi, "");

  var str2 = str.toLowerCase().replace(/\s/g, '').replace(
    /[^a-zA-Z 0-9]/gi, "").split("").reverse().join("");


  if (str1 === str2) {
    return true;
  }
  return false;
}

palindrome("almostomla");