On May 11, 2011, at 12:54 PM, Brendan Eich wrote: > On May 11, 2011, at 12:44 PM, Oliver Hunt wrote: > >> So you want to do >> if (map.has(bar)) >> wiffle = map.get(bar) >> >> or some such? >> >> The problem here is that you can't guarantee that GC won't happen between >> those two calls, and therefore you could still end up getting undefined in >> response to the get. > > Not if bar refers to the key object, since it must be a strong ref.
Re-reading the weakmap definition makes weakmaps seem fundamentally different to any other weakmap API i've ever encountered. The most common weakmap use cases i am aware of are all essentially caches, and this definition doesn't support that use case at all. It seems completely bizarre to me that the key should act as a root for the value it is associated with. --Oliver _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
