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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 wording of this kata is confusing. Not sure exactly what is being asked.
Very clever, though I would hesitate to call this best practice, as it does not seem very explicit code to me. Is the reduce method more performant than other solutions to this problem?
My eyeballs!