Jeff Walden wrote:
On 06/12/2014 03:05 PM, Allen Wirfs-Brock wrote:
> I believe this behavior for for-in was added in ES5. My recollection was
that Doug Crockford pushed for it. I don't recall if it was because it matched
web reality or simply because he thought it was a good idea.
It was added for web compatibility, to track what was originally a SpiderMonkey
implementation bug, I believe.
Actually, if memory serves, IE JScript tolerated null and undefined on
right of for-in. SpiderMonkey and my ur-JS implementation, Mocha, did
not. Someone with the jwz nostalgia Netscape 2/3 browsers, please test.
I don't think bug-hiding precedent trumps bug-finding, personally. Allen?
/be
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