Cancelling promise operation

[Nicolas FROIDURE]

Hi,

I'm currently creating a simple promises implementation based on this specification.

I made a proof of concept based on it to illustrate how promises-based apps could look like : http://codepen.io/seraphzz/pen/oHdJD

But i had to deal with an unexpected problem. Some promises are based on events and when a view is hidden, i need to be able to "cancel" those promise. I suppose the same goes for XHR requests.

So i think it lacks of a way to cancel a promise, is there any work on it currently ?

What i done to deal with its problem is saving a Promise.prototype.dispose method in return of the promise logic function. So, when need, when can cancel promises to avoid memory leak like in the Promise.any method that in fact don't wait for each promises to be released.

Have you any feedback to give on promise cancelling ?

[Jason Denizac]

Nicolas, active development on the successor to Promises/A is happening at this github organization: https://github.com/promises-aplus

There is a repository there hosting discussion of a proposed cancellation specification.

jason

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