I am really addicted to solving issues in one line, congrats :D

I think you mean inefficient

is it trend to solve task in one line xd?

Perfect solution

Like

Very beautifull and insufficient sulution! I like it!

the power of OOP

It is a really witty and interesting solution 👍

However, when it comes to production code, it will be more efficient in terms of performance and readability to use only one "for" loop

p. s.: didn't quite get why we need a spread operator here? Isn't this immutability for the sake of immutability?

Yeah, I've found that it's good practice to use those in functional programming, as they won't mutate the originalinputs/array

Big fan of thes use of new, keys, and the ternary conditional in this solution.

What would you return for 0? And it doesn't say only anywhere:

Additionally, if the number is negative, return 0 (for languages that do have them).

Don't understand a thing here honestly, imposter syndrome kicks back in :(