Reverse Integer

var integer = 123;

function reverse(integer) {
  var reversedInteger = 0;
  while(integer != 0) {
    var last = getLast(integer);
    reversedInteger = reversedInteger * 10 + last;
    integer = (integer - last) / 10;
   }
   return reversedInteger;
}

function getLast(integer) {
   return integer % 10;
}

console.log(reverse(integer));