I believe Tab is asking for something like: `var MyNodeList = new ArrayType(EntryType, length);`
where `EntryType` is his own type and the result is an array like collection or map. At least, for what I understood, looks like he's asking for JS CTypes, something rumored a while ago but never heard about again (while asm.js has been introduced/implemented already) If I am mistaking, apologies. On Wed, May 22, 2013 at 10:35 AM, David Bruant <[email protected]> wrote: > Le 22/05/2013 19:02, Tab Atkins Jr. a écrit : > > On Wed, May 22, 2013 at 9:44 AM, Brendan Eich <[email protected]> >> wrote: >> >>> NodeList extends Array now but is not literally Array plus hooks. Same >>> for Map and the quite different thing you're specifying. >>> >> NodeList is an interesting case, actually. It's an Array, but with a >> type restriction. >> > I'm a bit lost here. What exactly do you label as "Array"? What is a "type > restriction"? > > For sure, Array.isArray(anyNodeList) === false > So the ES spec seems to disagree with the statement "a NodeList is an > Array" > > > Live NodeLists even have basically the same linkage >> behavior I'm talking about. >> >> What do I need to do to get a Map like that? >> > Proxy is the answer to your question (FWIW I've made a proxy-based > implementation of arrays a while back [1]). But both cases can't really be > compared. > From a dev perspective, the interface of an array is its own properties > (numerical up to 2^32-1, connection with the .length property...) and the > interface of a map is the methods/accessors on the prototype ([[MapData]] > being "just" a spec tool that could be replaced by anything else as long as > prototype methods were behaving observably the same) > > If your object can have *any* property name, that can shadow the > get/set/has property you need to interact with your map. I'm not sure what > the solution is, but a proxy doesn't sound like a good idea at least > because of the shadowing issue. > > David > > [1] https://github.com/**DavidBruant/HarmonyProxyLab/** > blob/master/ProxyArray/**ProxyArray.js<https://github.com/DavidBruant/HarmonyProxyLab/blob/master/ProxyArray/ProxyArray.js> > > ______________________________**_________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/**listinfo/es-discuss<https://mail.mozilla.org/listinfo/es-discuss> >
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