Performance - Array.forEach vs implemented version

Question

I would have expected a native version to be faster.

What gives?

http://jsperf.com/native-vs-implmented-0

Implementation

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Answer 1

forEach() does more than your implementation. If you don't need the extra effort that the official algorithm performs, a simple implementation like yours is indeed preferable when raw speed is required.

The 'official' algorithm is described in the MDN reference for Array.forEach.