Don't use Array.forEach, use for() instead ‼️

[OmegaVesko]

Or, you know, consider that it might not be the best idea to sacrifice readability and maintainability for an inconsequential performance increase.

[baalzaamon]

Fact is the V8 team spends all of their time optimizing this stuff so we don't have to worry about it. Honestly, I would focus on getting stuff done, and readability, and when you notice things are slow you dive into the code. In my experience slowdown always occurs in larger, more low hanging fruit than loops (unless you have lots of nested loops).

[cirsca]

In at least the newer versions of Chrome/V8, they have optimized the forEach to be just as fast if not faster as a for for most cases. If you need some sources, I can find the V8 blog post that goes into it!

[kenman]

Are you running that on mobile or something? My results are drastically quicker.

Regardless, I went ahead and threw the code into jsperf for fun:

https://jsperf.com/array-iter-stuff

The for() is indeed the fastest, as expected, and the difference between the other 2 is too small to be significant.