Get loop counter/index using for…of syntax in JavaScript

Question

Caution:

question still applies to for…of loops.> Don\'t use for…in to iterate over an Array, use it

Answer 1

On top of the very good answers everyone posted I want to add that the most performant solution is the ES6 entries. It seems contraintuitive for many devs here, so I created this perf benchamrk.

It's ~6 times faster. Mainly because doesn't need to: a) access the array more than once and, b) cast the index.