JavaScript closure vs. object look-up performance

Note: the question asked in this post, "why aren't closures super-fast?", was thorougly answered by Vyacheslav Egorov in his followup. Reading that is probably more informative than reading the text below. I originally structured CodeMirror instances as one huge closure that contained all the internal variables. The constructor would create local variables for all internal state, and local functio

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クロージャーとオブジェクトのlookupについて