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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.
Man, seriously, thanks for your comment! It's a information so interesting! I really had no idea about that.
What is the point of initializing a variable to store in memory, when you can just return the actual operation itself?