On Fri, Mar 29, 2013 at 6:21 PM, Allen Wirfs-Brock <[email protected]>wrote:
> > On Mar 7, 2013, at 11:05 AM, Andreas Rossberg wrote: > > On 7 March 2013 18:30, Allen Wirfs-Brock <[email protected]> wrote: > > On Mar 7, 2013, at 7:37 AM, Andreas Rossberg wrote: > > > 1) Are the methods of a generator object installed as frozen > > properties? (I hope so, otherwise it would be more difficult to > > aggressively optimise generators.) > > > We discussed the factoring of the generator objects at the Nov 27 meeting. > > https://github.com/rwldrn/tc39-notes/tree/master/es6/2012-11 there is a > > sketch of the hierarchy we agreed to in in the notes > > https://dl.dropbox.com/u/3531958/tc39/generator-diagram-1.jpg > > > TThe design I presented at the meeting is very close to that final one, > > answers this question, and is easier to read: > > > http://wiki.ecmascript.org/doku.php?id=meetings:proposed_generator_class_hierarcy_nov_2013.png > > > Ah, thanks. It seems that I missed that part of the meeting. I'll have a > look. > > > I created a more readable class hierarchy diagram based on the above > photo from the Nov. meeting. This is what I'm using as my guide for > putting generators into the spec. draft. > The diagram is at > http://wiki.ecmascript.org/lib/exe/fetch.php?cache=cache&media=harmony:es6_generator_object_model_3-29-13.png > > > The most significant change from the meeting (and it really wasn't > explicit on the whiteboard) is that generator prototypes don't have a > "constructor" property that links back to its generator function instance. > In other words, you can't say: > > function * ofCollection() {for (i of collection) yield i}; > var itr1 = ofCollection(); > var itr2 = iter1.constructor(); //TypeError > That wouldn't be a type error. It would be invoking the value of the inherited generator property. > > Allowing such constructor access seems like an unnecessary (and possibly > undesireable) capability when you just passing generator instances around > to be used as iterators. Anybody disagree? > > itr1 instanceof ofCollection > > still works (subject to the usual instanceof caveats) > > Allen > > > > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > > -- Cheers, --MarkM
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