Dylan-Thomson

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

palindrome("eye");

Dylan-Thomson

function factorialize(num) {
  if(num === 0) {
    return 1;
  }
  return num * factorialize(num - 1);
}

factorialize(5);

Dylan-Thomson

function reverseString(str) {
  return str.split('').reverse().join('');
}

reverseString("hello");