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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.
Yustynn did a great job explaining what I meant.
I'm pretty jelly I didn't think of this one. Its faster, shorter and maybe more readable.
I like your functional approach although it doesn't feel idiomatic.
Very good use of a 1 liner but I don't like it because you it'll run in worst case 2n time where you can do it in n time.