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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.
The point of codewars is to practice your problem solving and coding skills by doing the problem yourself, without having a library do the enitre thing for you. Yes you're 100% right that a better and more convenient solution exists, but you won't learn anything about the concept itself if you don't think hard and just google a function for it instead
And about banning the library, you're right that they could've banned it, but it wasn't intended to be used, otherwise the kata would be 7 or 8 kyu instead
Yeah