Idea for a simple $.Deferred queue

queue.js

var Queue = function () {
  this.initialize.apply(this, arguments);
};

var p = Queue.prototype;

p.initialize = function () {
  _.bindAll(this, ['check']);

  this.items = [];
  _.extend(this, Backbone.Events);
};

p.check = function () {
  this.items = _.filter(this.items, function (r) {
    return r.state() === 'pending';
  });

  if(this.items.length === 0) {
    this.trigger('queue:complete');
  }
},

p.add = function (func) {
  this.items.push(func);
  func.always(this.check);
};

  
function getRandomInt(min, max) {
  return Math.floor(Math.random() * (max - min + 1) + min);
}

var t = new Queue();

for(var i = 0; i < 25; i++ ) {
  t.add($.Deferred(function (dfd) {
    setTimeout(dfd.resolve, getRandomInt(1000, 8000));
  }));
}