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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.
This solution is rather clever and beautiful, but it is not that easy to read especially when the reader doesn't know what exactly this function does. No offense, this is clever and beautiful. I just won't use such style in any production code.