Thanks Andrew, I wonder if I should update the proposed spec somehow, but I thought as it is combines both Names and Symbols as abstract.
Please let me know and I'll update. Best Regards On Thu, Mar 6, 2014 at 1:21 PM, André Bargull <[email protected]> wrote: > I would rephrase into this: > > if you need a getOwnPropertyNames trap, you might need for consistency a > getOwnPropertySymbols independently from getOwnPropertyDescriptors since > these methods are already available. > > > While it shares the same name with Object.getOwnPropertyNames(), this > getOwnPropertyNames trap is supposed to return string and symbol keyed > properties, see http://esdiscuss.org/topic/ownpropertykeys . > > > > I also would like to add a couple of links to support the fact > getOwnPropertyDescriptors > is needed, and has been asked for, since quite a while: this was 11th of > November 2011 ... I didn't know it, and now that I do I wonder why this has > been post-poned for so long and never discussed again. > https://mail.mozilla.org/pipermail/es-discuss/2011-November/018275.html > > > Or even earlier, > http://wiki.ecmascript.org/doku.php?id=strawman:extended_object_api from > 2010. > > > > Best Regards > > > On Thu, Mar 6, 2014 at 11:24 AM, C. Scott Ananian <ecmascript at cscott.net > <https://mail.mozilla.org/listinfo/es-discuss>>wrote: > > >* If you use a getOwnPropertyNames trap, then you also need a > * > >* getOwnPropertySymbols trap to implement getOwnPropertyDescriptors. > *>* --scott > *> > >* On Thu, Mar 6, 2014 at 2:16 AM, Tom Van Cutsem <tomvc.be at gmail.com > ><https://mail.mozilla.org/listinfo/es-discuss>> wrote: > *>* > 2014-03-05 20:11 GMT+01:00 C. Scott Ananian <ecmascript at cscott.net > <https://mail.mozilla.org/listinfo/es-discuss>>: > *>* >> > *>* >> On Wed, Mar 5, 2014 at 1:39 PM, Tom Van Cutsem <tomvc.be at gmail.com > <https://mail.mozilla.org/listinfo/es-discuss>> > * > >* wrote: > *>* >> > Object.getOwnPropertyDescriptors(proxy) would trigger the > *>* >> > getOwnPropertyNames trap, followed by calls to the > *>* >> > getOwnPropertyDescriptor > *>* >> > trap for each individual property. > *>* >> > *>* >> [[OwnPropertyKeys]], `ownKeys` trap. > *>* > > *>* > > *>* > Yes, according to the current draft spec. I have a pending discussion > *>* with > *>* > Allen that we actually need to reintroduce a [[GetOwnPropertyNames]] > *>* > internal method / getOwnPropertyNames trap, as the `ownKeys` trap > *>* doesn't do > *>* > any invariant checking, which is needed for a reliable Object.isFrozen > *>* test. > *>* > > *>* > Regards, > *>* > Tom > *> > >
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