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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.
Hmm. Good point. Perhaps
ball_typeorballTypewould have been better. :-/Obviously not a very important point, as the submission tests didn't check for it. :-(
What's with the non-square input array in the fourth submit test? Am I just misunderstanding, or...?
Maybe just a bad failure-message on the test-assert?