Cheat sheet: creating Arrays http://2ality.com/2018/12/creating-arrays.html#cheat-sheet-creating-arrays …pic.twitter.com/RcQMQUYXoh
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Isn't creating arrays of undefined a perf issue I think i learnt this from one of your talk explaining why holey arrays are bad.
Note that the value `undefined` is not the problem. Holes are!
It shouldn't be this difficult to create an array. This should be top priority for the TC39.
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