How does this interact with Proxies[1]? I know the answer probably starts with "whitelist", but let's spell it out in this context, and test it against the 8 membrane transparency cases previously discussed. If there are good answers for all of these, and if we can reuse enumerable: for this purpose as Brendan suggests, then I'm guardedly positive. I do not want to introduce a new attribute.
[1] For now, I agree that the proxies we should examine are direct proxies. On Sun, Feb 10, 2013 at 9:30 AM, David Bruant <[email protected]> wrote: > Le 10/02/2013 17:16, Mark S. Miller a écrit : > > I do not understand what is being proposed. When I try to imagine a >> proposal starting from what has been said, I have not been able to imagine >> something that works. But that's not a criticism. What is this alternate >> privacy idea? >> > My understanding is: > * there is only one kind of symbol > * whether the symbol is reflected by Object.getOwnPropertyNames and the > likes is controlled by a 'private' attribute in property descriptors. > > // unique constructor, no boolean since there is only one kind of > symbol > var s = new Symbol(); > var o = {}, o2 = {}; > > Object.defineProperty(o, s, {value: 12, private: true}); > assert(Object.**getOwnPropertyNames(o).length === 0) > assert(o[s] === 12); > o[s] = 31; > assert(o[s] === 31); > > Object.defineProperty(o2, s, {value: 7, private: false}); > assert(Object.**getOwnPropertyNames(o)[0] === s); > assert(o2[s] === 7); > o2[s] = 13; > assert(o2[s] === 13); > > Pending question: > var o3 = {}; > o3[s] = 62; > Object.**getOwnPropertyDescriptor(o3, s).private // true or false? > > Since private:false implies symbol sharing through > Object.**getOwnPropertyDescriptor, > I think private:true should be favored to force people to be explicit (see > my reply to Brendan) > > The main difference with the current proposal is that privacy isn't an > inherent characteristic of the symbol, but related to how it's been > configured on the different objects it's been used on. > > Was the above one of the things you imagined? If yes, why doesn't it work? > > David > > ______________________________**_________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/**listinfo/es-discuss<https://mail.mozilla.org/listinfo/es-discuss> > -- Text by me above is hereby placed in the public domain Cheers, --MarkM
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