- From: Harald Alvestrand <harald@alvestrand.no>
- Date: Tue, 30 Sep 2014 12:39:09 +0200
- To: public-media-capture@w3.org
Den 30. sep. 2014 09:14, skrev Jan-Ivar Bruaroey:
> Here are the slides.
>
> .: Jan-Ivar :.
Thank you!
One question on slide 16:
function getUserMedia(constraints, success, failure) {
var p = navigator.mediaDevices.getUserMedia(constraints);
p.then(success);
p.then(failure);
}
The pattern I've seen people use before is p.then(success, failure).
Is this somehow equivalent?
I can't remember having seen what the semantics are of calling p.then
twice on the same promise - from the ES6 draft you link to:
http://people.mozilla.org/~jorendorff/es6-draft.html#sec-promise.prototype.then
it seems to be stacking handlers on the [[PromiseFulfilReactions]] slot,
which doesn't make sense to me in this context.
(this feeds into a gripe I personally have with promises - every time I
try to find the actual spec, I'm lost in a twisty little maze of
proposals, all subtly different. Thanks for including the link to what
you think the current spec is!)
Harald
Received on Tuesday, 30 September 2014 10:39:39 UTC