On Dec 8, 2009, at 11:38 AM, Mike Samuel wrote:
Agreed, but Erik's point here was about instanceof. Not only mutable
__proto__, but mutable bindings for constructors, and the issue of
multiple
global objects with their unrelated suites of builtin constructors,
make
instanceof less than ideal for deciding "array-like".
Ah ok. I agree with Erik then. Even moreso, instanceof doesn't work
cross context.
Yes (what I meant by "multiple global objects").
In ES1-5, length is not enumerable for Array, String, and arguments
objects.
Anything array-like, same deal or it's not "like" enough.
Maybe I'm imagining things, but I'm pretty sure that on some browsers
length is enumerable on arr in
var arr = [1,2,3]
arr.length = 2;
That would be a straight-up conformance bug:
js> a = [1,2]
[1, 2]
js> a.length
2
js> for (i in a)print(i)
0
1
js> a.length = 0
0
js> for (i in a)print(i)
js>
Name names, take prisoners! Which browser(s)?
/be
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