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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.
Ah darn! Thank you so much for the informative and clarifying response.
Why hasn't this kata been published?
An Array.
I believe the instructions could be more clear to indicate that what is being passed into the function is an array, and not just some generic list. Which is perhaps most meaningful for JS developers.