By Terry Jones
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Extra resources for Learning jQuery Deferreds
75 }, 200) ); How will this behave differently from our earlier two fragments that used then and done? promise() on the result of the call to animate? A Promise Pool with an emptyPromise Method When running a node service, you’ll occasionally need to shut it down. The service might have many requests in progress, so ideally, you should shut things down grace‐ fully. Some of the outstanding requests may have users on the other ends of them. When the shutdown signal arrives, you may need to make several calls to cleanly disconnect from other services or to start others.
The function we’re returning can accept latitude and longitude arguments, so if we’re provided with these, call getMap directly. Otherwise, get the user’s latitude and longitude from the browser. geolocation. Challenges 1. Storing just one last data URI in memory is pretty stingy. Add an LRU data struc‐ ture to store a larger number of recent results. 2. getMap is the only function in this book that calls a promise-returning function but ignores the returned promise. Can you see where? Why is the promise ignored?
The method is actually identical to the (documented) promise method of its deferred. So if func returns a promise, calling promise() on it simply returns the promise. More usefully, if func happens to be a call to animate, the call to promise() is essential—it ensures that the returned value, passed to then, is a promise. See the challenges below for more on this. This slightly dubious line reuses (updates) the promise variable to hold the promise returned by calling then on the current promise.