Checks if String is a palindrome.

palindrome.js

function palindrome(str) {
    // Convert to lower case and replace everything what's not a letter or a number.
    var x = str.toLowerCase().replace(/[^a-z0-9]/g, '');
    //convert string to array, turn it around and put it back together an match it against filtered string:
    return x.split('').reverse().join('') === x;
}


palindrome("eye");


/*
 palindrome("eye") should return a boolean.
 palindrome("eye") should return true.
 palindrome("race car") should return true.
 palindrome("not a palindrome") should return false.
 palindrome("A man, a plan, a canal. Panama") should return true.
 palindrome("never odd or even") should return true.
 palindrome("nope") should return false.
 palindrome("almostomla") should return false.
 palindrome("My age is 0, 0 si ega ym.") should return true.
 palindrome("1 eye for of 1 eye.") should return false.
 palindrome("0_0 (: /-\ :) 0-0") should return true.
 */