jQuery’s deferred objects can be tough to get your head around. Specifically learning the difference between always, done, fail, and then. Let’s go over them really quick and then dive into some examples!

  1. Always – called when the deferred object resolved or rejected
  2. Done – called when the deferred object is resolved
  3. Fail – called when the deferred object is rejected
  4. Then – a nice shorthand that allows you to pass in a done and then optionally a fail and a progress

Some Examples

Let’s cement this with some easy examples!

Always

Done

Fail

Then

Hope that helps! There are a bunch of other cool methods you should check out! Let me know in the comments if you have any questions.