On Fri, Jan 6, 2012 at 1:29 AM, François REMY <fremycompany_...@yahoo.fr>wrote:
> Such an implementation would be very slow and not efficient, because > searching for a key in the "boundFunctions" weakmap would take time. It can > be a polyfill solution but a new implementation need something better. > > I think the solution would be to create an "invisible" [[boundFunctions]] > property for all objects containing a dictionnary<weak<function>, > weak<boundFunction>> of already-bound functions on the object. The > implementation of bind would then be : > > - if objToBind is not a reference, create a new boundFunction and return > it. > - if objToBind.[[boundFunctions]] don't exist, create it. > - else, check if it contains a key for functionToBind //when you are > processing the dictionnary, remove obsolete entries you may find > - if yes, check if the weak reference is alive > - if yes, returns the boundFunction > - create a new boundFunction and store it into objToBind.[[boundFunctions]] > - return the newly created boundFunction > > Would that be possible? > No, for the same reason. The mutable state you hung off this internal property creates an ambient communications channel. > > François > > > > -----Message d'origine----- From: Brendan Eich > Sent: Friday, January 06, 2012 2:22 AM > To: Andrea Giammarchi > Cc: Axel Rauschmayer ; François REMY ; es-discuss > Subject: Re: Improving Function.prototype.bind > > On Jan 5, 2012, at 4:47 PM, Andrea Giammarchi wrote: > > Guys, by any chance we can go back into the topic? >> > > You'll have to polyfill Function.prototype.bind in the current world of > pre-ES5 browsers. Why not then go on to wrap it in a memoizing version that > uses a WeakMap if available (emulated with strong keys/values array-based > implementation if not)? > > If you need this machinery, it's all doable. If we should evolve a Harmony > bind or betterBind based on your experience and others, we can do that. > > Right now the lack of memoization is not a burning issue, from what I > hear. You've raised it, I think for the first time on es-discuss. > > /be > ______________________________**_________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/**listinfo/es-discuss<https://mail.mozilla.org/listinfo/es-discuss> > -- Cheers, --MarkM
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