palindrome check created by arrbxr - https://repl.it/@arrbxr/palindrome-check

palindrome check.js

function palindrome(str) {
  str = str.toLowerCase().replace(/[\w]/g, '');
  for(var i = 0, len = str.length - 1; i < len/2; i++) {
    if(str[i] !== str[len-i]) {
      return false;
    }
  }
  return true;
}
palindrome("ey_e");