The jQuery.Deferred object has a function .promise(), it returns a promise object. Some other people call it future. In the async framework of .net, it is called Task<T> . It an object that promise to deliver a value in the future. So if believe that promise, you can express your believing like this

promise.done(function () {
  var valuesOfFuture = [], 0);

The promise object does not has method of "resolve" and "reject". Because these method belong to server side. This pattern is very popular, but jQuery stream line this pattern. It is very useful pattern.