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let doesnt’t work in some browsers. Not in their interpeters/ web consoles either. Why?
(originally I thought there was an inconsistency b/t the browser interpeter and the jsFiddle, but it turns out not to be true, just bad tests on my part.)
It is a non-standard keyword introduced in JS 1.7, not necessarily implemented in different browsers.
https://developer.mozilla.org/en/JavaScript/Reference/Statements/let