jQuery anatomy of Deferred

gistfile1.js

(function($) {
  var myVar;

  var setVal = function() {
    var deferred = $.Deferred();

    setTimeout(function() {
      myVar = 'myValue';
      deferred.resolve();
    }, 2000);

    return deferred.promise();
  };

  setVal().done(function() {
    console.log('All done! ' + myVar);
  });
})(jQuery);

(function($) {
  $.fetchYouTube = function(feed) {
    return $.ajax({
      url: "http://gdata.youtube.com/feeds/mobile/users/" + (feed || "TEDtalksDirector") + "/uploads",
      data: {orderby: "published", alt: "json", v: 2},
      dataType: "json"
    }).promise();
  };

  $.fetchYouTube("TEDtalksDirector")
    .done(function(results) {
      console.log(results.feed.entry);
    }).fail(function() {
      console.log("Some bad thing happened!");
    });
})(jQuery);

(function($) {
  function fetchYouTubeFeed(userName) {
    return $.ajax({
      url: "http://gdata.youtube.com/feeds/mobile/users/" + (userName || "TEDtalksDirector") + "/uploads",
      data: {orderby: "published", alt: "json", v: 2},
      dataType: "json"
    }).promise();
  };
  
  $.when(fetchYouTubeFeed('Jayesslee'), fetchYouTubeFeed('davidchoimusic'))
    .done(function(results1, results2) {
      console.log(results1[0].feed.entry);
      console.log(results2[0].feed.entry);
    }).fail(function() {
      console.log("Some bad thing happened!");
    });
})(jQuery);