gistfile1.js

(function() {

  var sorted_array = [1,22,13,4,5].sort(function(a, b) {
    
    // you get a and b to sort.
    // if the function returns a..
    // negative number: a comes ahead in sort order
    // a positive number: b comes first

    return a-b;

  });

  console.log(sorted_array); 
  // returns [1, 4, 5, 13, 22]

})();