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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 for noticing, the description has been updated.
null isn't an array. Kind've annoying to have to make an exception for a wrong parameter being passed.
Edit: Ah, I see it in the 'Should Return' portion now. It's a little unclear with it being left out of the instructions.