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Part 9: Understanding JavaScript Async Promises

Posted: Feb 28, 2013 at 3:25 PM
By: BobTabor, Dan Fernandez, Jaime Rodriguez, Golnaz
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In this lesson, we backtrack and learn about the Async features in the WinJS Library. We cover the basics of processes and threads, how the Windows 8 execution model has changed, how apps have traditionally handled long running operations, and how Async Promises simplifies development and debugging of async operations.

Asynchronous programming in JavaScript

http://msdn.microsoft.com/en-us/library/windows/apps/hh700330.aspx

WinJS Promise Example

http://code.msdn.microsoft.com/windowsapps/Promise-e1571015

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mshaw

Mar 27, 2013 at 11:02 AM

Isn't promises callbacks under the cover?
BobTabor

Mar 27, 2013 at 1:07 PM

@mshaw: I don't claim to be the expert on this at all. I have an "end user's" knowledge. However, this article:
http://dev.bennage.com/blog/2012/08/21/winjs-unpacking-promises/
... does a really nice explaining what the promise really is and how it relates to callbacks.
"A promise is an object. It is not a function and it is not the value returned from the async operation. To get to the value, you need to call the then method on the promise object. You pass a callback function as an argument to then. The promise invokes the callback and passes the value you're interested in into the callback. Clear as mud, right?"