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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.
Argument mutation is not actually "Best Practices" though this solution has smart tricks
yeah that was a clever use of reduce, I should try to use it more often
doesn't work