To clarify I would like to see an example of how to actually write a implementation of Promises into my own library.
I understand the principle of how they work from using them in jQuery but I'm writing my own small utility library and would like to learn how to add Promises to my library. Hope that helps explain what I'm trying to achieve. Kind regards, -- Mark McDonnell On Monday, 28 March 2011 at 22:39, Dean Landolt wrote: > > > On Sun, Mar 27, 2011 at 11:47 AM, Mark McDonnell <[email protected]> wrote: > > Hi, > > > > I've been searching for an article to explain how to implement > > Promises/Defers/When/Then functionality but all I seem to find are articles > > based on how to use client/sever-side js libraries that already implement > > it. > > > > I have found a couple of Promise examples via Github gusts but they are > > extremely 'bare boned' and also don't explain how you could use them and > > for someone like me I learn better through working examples. > > > Why do you need to implement when there are so many implementations already? > In any event, here's Kris Zyp's (the author of the standard) implementation > of Promises/A [1]. And Kris Kowal's robust implementation [2] -- I think it > was originally Promises/B but now supports thenables as well, and is > compatible with Promises/A "thenable" promises like what's in dojo and such. > > [1] https://github.com/kriszyp/promised-io/blob/master/lib/promise.js > [2] https://github.com/kriskowal/q/blob/master/lib/q.js > > > > > Any help would be really appreciated! > > Can you be more specific? Are you looking to implement a new lib or just > learn what they're all about? The "thenable" interface is pretty easy to wrap > your head around -- somePromise.then(callback, errback) -- that's all there > is to it. > > Of course, every good promise lib has a "when" function -- > when(possiblePromise, callback, errback) -- note the similarities to then's > signature, except it can be provided non-promises as well. There's really not > much to it, which is kinda the point. From there you can build other useful > control flow helpers. > > -- > To view archived discussions from the original JSMentors Mailman list: > http://www.mail-archive.com/[email protected]/ > > To search via a non-Google archive, visit here: > http://www.mail-archive.com/[email protected]/ > > To unsubscribe from this group, send email to > [email protected] > -- To view archived discussions from the original JSMentors Mailman list: http://www.mail-archive.com/[email protected]/ To search via a non-Google archive, visit here: http://www.mail-archive.com/[email protected]/ To unsubscribe from this group, send email to [email protected]
