he/him 
Whoa ... I just realized that default args in JS can take an expression that makes use of previous args in the argument list! ... ! 
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Nothing wrong with using it. In fact Babel already handles this correctly. You can only reference parameters declared before the expression. Which Babel also correctly errors on.
(Nothing wrong with using it in reference to those in the replies saying it’s bad...)
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Haha, ya I already did. I've got a great use case for it in some code I'm working on atm.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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