On Wed, Feb 14, 2018 at 7:03 AM, Raul-Sebastian Mihăilă < [email protected]> wrote: > > On Wed, Feb 14, 2018 at 8:25 AM, Bob Myers <[email protected]> wrote: >> >> For example, I did a quick test comparing `[1, 2]` and >>`new Array(1, 2)` and found that performance was identical, in >> spite of the claimed inefficiency supposedly introduced by the >> need to look up `Array`. >> > > I'm curious how you did that testing. Could you post is here?
FWIW: https://jsperf.com/literal-vs-new-array-in-nested-context `new Array(x, y)` does seem to be nicely optimized. Interestingly, the one-argument version (passing a non-number as the first argument to avoid that weirdness in `new Array`) is hugely slower on Firefox. But presumably that's because of the branch it has to take to check the type of the parameter (which is something it dosen't share with `Object.assign` vs spread). In the 2+ argument case, they're about the same, at least in that test. -- T.J. Crowder
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