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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.
Thanks! I have to admit, credit goes to a participant of the JSCraftCamp who came up with the identity function as a default parameter. We're solving them together during the "Crafters vs CodeWars" events.