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> To write fast JS you need to understand the basics of the engine

The problem is that there are many different engines out there.

Unless of course you are talking about server-side code. But for the server-side, there are more efficient solutions than just javascript.



Sure they are, but they employ mostly the same techniques. The implementation may differ, but the ideas remain the same, at least to the extent where well organized code optimized for one engine is unlikely to be slow in another.




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