so use the reduce is optimial because O(n) ?

nice try

This is O(n logn). The optimal is O(n).

OP solved it, closing

I basically created an extra variable for no reason. -______-
Great Job.

This is what I consider clever, not using the built in function.

same

Of course you can.

Didn't think of that. Good Point! Also like your solution using the spread operator.

Mutating the parameter ... ouch!

Closing this issue.

You should consider it.

So is it not adding/removing coins from its stock?

No problem!

Well chances are I forgot it. I've been trying Python kata before I officially learn the method/loop to see how quick I can pick it up after JS. So focused on the workings I'm making tiny errors.