well On Mon, Aug 10, 2015 at 6:15 PM, joe <[email protected]> wrote:
> I actually like `[1, 2, 3, 4, 5, 6].contains(a)` better, too. The > question is, will engines actually optimize it. > > if the entire environment never touches even "by accident" the `Array.prototype` I don't see why that couldn't be optimized by the engine ... but in general, if a *small* `Array#contains` is the performance bottleneck of any application I think there's probably something else wrong there, or maybe the only better performance approach would be a `switch` with all cases well defined with a `break` (as someone somewhere suggested once about a speedy subset of JS) Regards
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