Less optimal with larger numbers, but a very clean solution.

This is the fastest and best solution.

I'm not educated in programing, but isn't that n^3?

.map .each_cons .map O(n^3)?

Just one small nit. size is preferred over lenght

https://rubystyle.guide/#map-find-select-reduce-include-size

Thank you for this! I was so confused I had to search for tips in the discussion. It is clear now and yes I agree the kata description needs to be updated with your suggestion.

I didn't know about lazy enumerables until your comment. Thank you!

The problem statement implies that test_even(2.0) should return true, but this code will return false.

Updated to Node v14

it doesn't. "shadowing" implies overwriting, which is not the case here.

puuuurdy good 🦊

I like this implementation of round!~

JS function name should not be every since it shadows an existing Array prototype

• Python new test framework should be used (Refer this & this for more detail)

• Node 14 should be enabled (Refer this and this for more info)