Hi Adam,
Just sharing my $0.02 : I implemented a two-way binding system in my first
JavaScript framework at Apple in 2007, designed as a layer on top of a property
change observing API, like in Cocoa, and that’s still our design in Montage
today. I’ve never felt the need nor understood why observing changes on a whole
object were useful for bindings, and without measuring, I was concerned (maybe
wrongly) by the performance overhead of doing so.
Thanks for the update.
Benoit
> On Nov 2, 2015, at 10:27 AM, Adam Klein <ad...@chromium.org> wrote:
>
> Over three years ago, Rafael Weinstein, Erik Arvidsson, and I set out to
> design and implement what we believed to be the primitive underlying the
> data-binding system of MDV ("model-driven views"). We prototyped an
> implementation in a branch of V8, then got agreement from the V8 team to
> build a real version upstream, while pushing Object.observe ("O.o") as a part
> of the upcoming ES7 standard and working with the Polymer team to build their
> data-binding system on top of O.o.
>
> Three years later, the world has changed in a variety of ways. While other
> data-binding frameworks (such as Ember and Angular) showed interest, it was
> difficult to see how they could evolve their existing model to match that of
> O.o. Polymer rewrote from the ground up for its 1.0 release, and in that
> rebuilding did not utilize O.o. And React's processing model, which tries to
> avoid the mutable state inherent in data-binding systems, has become quite
> popular on the web.
>
> After much discussion with the parties involved, I plan to withdraw the
> Object.observe proposal from TC39 (where it currently sits at stage 2 in the
> ES spec process), and hope to remove support from V8 by the end of the year
> (the feature is used on 0.0169% of Chrome pageviews, according to
> chromestatus.com <http://chromestatus.com/>).
>
> For developers who have been experimenting with O.o and are seeking a
> transition path, consider using a polyfill such as
> https://github.com/MaxArt2501/object-observe
> <https://github.com/MaxArt2501/object-observe> or a wrapper library like
> https://github.com/polymer/observe-js <https://github.com/polymer/observe-js>.
>
> - Adam
> _______________________________________________
> es-discuss mailing list
> es-discuss@mozilla.org
> https://mail.mozilla.org/listinfo/es-discuss
_______________________________________________
es-discuss mailing list
es-discuss@mozilla.org
https://mail.mozilla.org/listinfo/es-discuss
