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A comment on Overview of JavaScript ES6 features. Parent comment

Re:Overview of JavaScript ES6 features by taternuts on Monday October 24, 2016 @11:42AM (#12779808)
This is an important distinction, and as far as I know, none of the new features are very optimized. If you really want to write performant JS without a build step, you basically have to write it ES3-5 style, use for loops over maps and foreaches, etc
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Re:Overview of JavaScript ES6 features by bzbarsky on Monday October 24, 2016 @01:14PM (#12780746)
> none of the new features are very optimized

I think for-of is getting pretty good. It's a bit of a pain to optimize because the iteration protocol in ES6 is designed in such a way that you have to do heroics (scalar replacement) to have any hope of optimizing it well. But engines are getting there.

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