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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.
Love the use of the negative offset in the slice - my solution is exactly the same as yours except that I used slice(0, r.length - 1). Because of that, it's far less elegant than yours. Kudos.