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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.
I'd love to come back to this one. I am not understanding the directions. It sounds like we should be producing 40 total functions, but the code window only has 14. If you do each of the 4 mathematical operations on each of the 10 digits, that would be 40 functions. What am I not understanding?