Yeah, you definitely should only submit the best possible code in 8 kyu katas, or else all your future employers will see them and find out how bad of a programmer you are.

Almost same as mine, thought I went for a helper function. I feel like it's more readable this way once you come back to your code after a few months, easy to grasp what's going on.

Clever as hell!

Surely in production code this isn't best practice?

Hardly readable

For sake of practicing filter I used .filter 6 times as well, but this could be done better with just an if/else one iteration.

I had no idea that slice floors the result! Very informative, thank you!

Very easy to read actually

One of worst descriptions ever.

I was going to use .reduce as well but this seems more efficient to me.