Luke Hoban wrote:
The ES6 draft grammar no longer allows the following, which was legal ES5:for(var i = 1 in []) {} Was that an intentional breaking change? If so, why?
Yes, to simplify and tighten up grammar (and engines). We reckoned that only testsuites counted on this. This was recorded in some meeting notes but I'm not free to dig them up right now.
(Of course, there are exceedingly limited practical uses of this, but that alone doesn't seem to justify a breaking change).
We had some web crawling help, IIRC. We also figured we had time to test and put it back, if needed. Did you find web content using it?
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