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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.
Simple, but the filter makes the array read twice, which is not ideal. Good enough for short strings.
Very readable. I would not use "else if" because of the return statements tho.
Still I would choose this solution over the upvoted ones.