check-number-even-or-not.js

// ES 5
function is_even_recursion(number) {
  if (number < 0) {
    number = Math.abs(number);
  } else if (number === 0) {
    return true;
  } else if (number === 1) {
    return false;
  } else {
    number = number - 2;
    return is_even_recursion(number);
  }
}
console.log(is_even_recursion(234)); //true
console.log(is_even_recursion(-45)); // false
console.log(is_even_recursion(-45)); // false