Initializer expression on for-in syntax subject

Brendan Eich brendan at
Sat Mar 15 14:01:40 PDT 2014

Brendan Eich wrote:
> 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.

Of course I was excluding the recent removal per draft ES6 that Oliver 
mentions in the root of this thread, "JSC has been trying to kill off 
the initialiser expression in the for(in) statement" -- sorry for 
confusion. Just to be clear, this is recent and per ES6, intentional.

Hoping my site evang pals can get somewhere with


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