Chapter 15.1.8. Canceling Deferreds
What if that large pepperoni pizza ordered in the preceding section has arrived? Do you still want the 30-minute timer alert box to pop up? Probably not.
Deferreds have a cancel method that allows you to cancel the Deferred before it has received a value. Both wait and callLater return a cancelable Deferred. If you hang on to the Deferred in a variable that’s available to scripts on the whole page, you can create a “My Pizza Has Arrived†button that calls d.cancel() when the button is pushed.
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