WeakMap is in Harmony...
http://wiki.ecmascript.org/doku.php?id=harmony:weak_maps
On Thu, Sep 15, 2011 at 1:47 PM, Allen Wirfs-Brock <al...@wirfs-brock.com>wrote:
>
> On Sep 15, 2011, at 10:21 AM, Sean Eagan wrote:
>
> Would a WeakPair primitive be useful...
>
> let wp = new WeakPair(key, value);
> ...
> if(wp.hasKey(key)) {
> foo(wp.value());
> }
>
> WeakMap could be built on top of this primitive:
>
>
> It's not that easy. Read
> http://www.arnetminer.org/dev.do?m=downloadpdf&url=http://arnetminer.org/pdf/PDFFiles/--g---g-Index1247931776950/Ephemerons
> A New Finalization Mechanism1247944577286.pdf
>
> You need Ephemeron pairs to build such abstractions
>
>
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