Especially when Array(N).fill(0).forEach((_, key) => ...) gives you the same exact functionality without the second eager array if you're seriously trying to avoid for loops.
Unless there's a reason to use Array.forEach such as automatic paralellization or some other SIMD-like optimization that can be done that cannot be done in a forloop.
A lot of cargo-cult programming seem to take functional programming to mean programming using the map/reduce/foreach functions, and you end up with shitty code like [...Array(N).keys()].foreach(), just so you can somehow claim that you're doing functional programming.
