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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.
For me its a realy clever solution but not a best practice. Readability could be better, style: empty line after guard clause?, and no need for attr_reader...
But don't get me wrong it's still a absolute nice and clever solution in my opinion...