On Dec 7, 2009, at 6:24 PM, Mike Samuel wrote:
2009/12/7 Yehuda Katz <wyc...@gmail.com>:
Your strawman would support:
{0: "strawman", length: 0}
A better definition might be:
o is an array like object if o[[Get]]('length') returns a Number
one
greater than the largest numeric property, or 0 if no numeric
properties
exist.
By that better definition the array [,] is not array like.
Holes, yuck. Bringing up holes makes me sad. Prototype element of the
same index shows through a hole :-(.
The need to distinguish between the two in library code could be
mooted if for (in) on arrays iterated over the array index
properties
of arrays in numeric oder order first, followed by other
properties in
insertion order, and host objects like NodeCollections followed
suit.
+1 on this -- it has come up before on-list, most recently in a thread
where Maciej tested browser implementations extensively:
https://mail.mozilla.org/pipermail/es-discuss/2009-October/010060.html
/be
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