Function isPalindrome

javascript/0125-valid-palindrome.js:8–15

(s)

 * @return {boolean}
 */
var isPalindrome = function (s) {
    if (!s.length) return true;

    const alphaNumeric = filterAlphaNumeric(s); /* Time O(N) | Space O(N) */
    const reversed = reverse(alphaNumeric); /* Time O(N) | Space O(N) */

    return alphaNumeric === reversed;
};

const filterAlphaNumeric = (
    s,