palindrome.js

function palindrome(str) {
  
  function reverseString(str) {
  
    str = ((str.split('')).reverse()).join('');
  
    return str;
  }
  
  if((str.toLowerCase()).replace(/[\W_]/g,'') === 
         (reverseString(str).toLowerCase()).replace(/[\W_]/g,''))
  {
    return(true);
  }
  else
  {
    return(false);
  }
}

palindrome("eye"); //true //Output === "eye"
palindrome("never odd or even"); //true //Output === "neveroddoreven"
palindrome("A man, a plan, a canal. Panama"); //true //Output === "amanaplanacanalpanama"
palindrome("0_0 (: /-\ :) 0-0"); //true //Output === "0000"