On Tue, Oct 4, 2011 at 5:12 PM, John J Barton <johnjbar...@johnjbarton.com>wrote:
> > > On Tue, Oct 4, 2011 at 12:59 PM, Bob Nystrom <rnyst...@google.com> wrote: > >> >> A constructor is different from a regular function. Instead of returning >> the value that the body of the function returns, it returns a special >> newly-created object. >> > > Sorry, already you lost me ;-) I guess you mean the operand of "new"? If > so, then the different thing is the operator 'new'. It's "new" that makes > the operand a constructor. > > > >> Likewise, a generator is a special function that doesn't return what the >> body returns. >> > > But it does not look special. There is nothing similar to 'new' involved in > the invocation of the generator. > > >> Instead, it returns an object that lets you interrupt and resume that >> function. This object exposes a next() method. When you call that, the >> function runs until it hits a yield. When it does, the function is paused >> at that point, and the result of the yield is returned from next(). The >> next time you call next() it picks up from there and continues. >> > > and the state of the generator is hidden from the developer as far as I can > tell. > > I think generators are an excellent example of a feature that is well > prototyped (in FF JS 1.7+). I think the developer uptake is minimal, outside > of the original advocates. > Of course uptake is minimal -- it's only in one engine, and even then it doesn't yet match the spec. > I don't hear any clamor for other browsers to implement this feature. If > generators never go further, that is an awesome outcome and we owe Dave > Herman and other proponents of generators a lot of thanks for their > efforts. Either way, "class" deserves at least as much investigation. > > jjb > > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss > >
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