Set iterators

Gavin Barraclough barraclough at
Tue Feb 14 22:05:45 PST 2012

Perhaps I am overly fatalistic here, but if we don't specify an iteration order I think the web will just go and specify it for us, as it has for object property iteration order.  We can bet against history repeating itself if we wish.

On Feb 14, 2012, at 7:13 PM, Brendan Eich wrote:
>> Mark Miller is holding up the argument for determinism really well.
>> I'm not sure anyone disagrees with his points. We should look into
>> deterministic data structures and measure the performance.
> Agreed.


On Feb 13, 2012, at 6:03 PM, Mark S. Miller wrote:
> Before getting too deep into iteration protocol for Sets (and Maps) there is a more fundamental issues:  Will Set define a standard, implementation independent ordering of elements? If so, what is the basis for the ordering?
> Yes. Insertion order.


Do you think we want strict insertion order, including for numeric index properties?  I guess I'm thinking the obvious here ( ), but it would seem a simplest for users if there were a single story for iteration order.


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