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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
isnt obvious to me at all
I don't think you need res=[] there and still too many concatenations.
I would vote for this, but too much comments as for me. At this level it should be pretty obvious what you do in code.
Love it, I little bit overthought my solution, this is much simpler.
I want to vote to "Clever" and "Best Practices" for this one.