jared_promises.js

(function(){

  var loadFirstNumber = function(){
    return new Promise(function(resolve, reject){
      var request = $.ajax({
        method: 'get',
        url:'/first.json',
      })
      request.done(function(result){
        resolve(result.value);
      });
    })
  };

  var loadSecondNumber = function(){
    return new Promise(function(resolve, reject){
      var request = $.ajax({
        method: 'get',
        url:'/second.json',
      })
      request.done(function(result){
        resolve(result.value);
      });
    })
  };

  var loadFirstAndSecond = function(){
    return Promise.all([loadFirstNumber(), loadSecondNumber()]);
  };

  var sumTwoNumbers = function(numbers){
    return numbers[0] + numbers[1];
  };

  var logResult = function(result){
    console.log('result: ', result);
  };

  loadFirstAndSecond().then(sumTwoNumbers).then(logResult);


})();