Can an Array have array indexed accessor properties and other curiosities??
brendan at mozilla.com
Sun Feb 15 18:41:06 PST 2009
On Feb 15, 2009, at 3:14 PM, Allen Wirfs-Brock wrote:
>> -----Original Message-----
>> From: Brendan Eich [mailto:brendan at mozilla.com]
>> Sent: Sunday, February 15, 2009 12:41 PM
>>> It would be nice to have some concrete examples to backup the
>>> assertions in the first quote above. Does anyone know of actual use
>>> cases or concrete examples where users have exploited this
>>> capability in interesting ways.
> Interesting, but not actually what I was asking about. Unless I'm
> missing something, in both these cases "array index" named
> properties are being defined on regular objects, not instances of
> Array and nothing discussed in this thread so for would interfere
> with that.
Oh, right -- hence the curses in those comments of mine.
I'll keep looking, but I don't know if I'll find the
__define[GS]etter__ usage you seek. If I'm forced in this little
debate to fall back on general principles, I'll stand with Mark and
oppose any non-virtualizability for Array elements. That still smells
> What I was asking looking for was example of using "array index"
> named properties with actual array instances.
Some implementations, notably v8, generalize their optimizations for
"array index" named properties over all objects, not just Array
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