What should Map iteration do?
brendan at mozilla.org
Thu Feb 16 14:23:00 PST 2012
Thaddee Tyl wrote:
> I cannot find the reason why sets and maps were harmoni'ed with
If you mean specified with classes, I flinched too -- especially at
private(this), syntax that is dead on arrival for classes (which are
still not likely to make it into ES6 IMHO).
IIRC Mark used classes to avoid hand-expanding to more verbose
functions, closures, freeze and seal calls, etc.
> They do support `mySet["foo"]` for `mySet.has("foo")` and
> `for (something of mySet)` for iteration, do they not?
No to mySet["foo"], yes to iteration (the topic at hand).
> Classes don't
> have operator overloading, so using classes makes it harder to see the
> usual syntax form.
Not sure about this. You see lack of mySet["foo"] clearly, you just
don't expect that kind of support to be missing ;-).
> Shouldn't we use proxies instead?
No, because we do not want the overhead of proxies for maps and sets, in
implementations, or anything observable that might leak to indicate
>  http://wiki.ecmascript.org/doku.php?id=harmony:simple_maps_and_sets
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