Peter van der Zee wrote:
Which browsers currently don't accept this construct? I wasn't even aware that JSC didn't support it at some point.
Did anyone say JSC lacked support? I think KJS followed ES3, and this was in the ES1 grammar, so I doubt it was never supported.
Minifiers might rely on this construct. And perhaps some js1k entries, if that matters anything.
Extremely doubtful. It doesn't save anything. A minifier cannot count on the loop iterating 0 times.
Why is there a desire for banishment anyways? Only lack of consistency compared to not using the var keyword,
This is only about the 'var' case. The initialiser in 'for (var x = y in z)' is due only to reuse of the wrong grammar nonterminal in ES1, based on JScript de-facto non-standard behavior. It is a wart and a pain to implement. We don't expect it to be hard to remove, unlike other warts, but we'll find out.
or was there a bigger problem with this? The thread comes out of the blue to me so I probably missed a prior discussion :)
ES6 revised the old grammar dating from ES1, breaking for(var x = y in z). That was intentional and discussed in past meetings and threads.
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