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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.
Omg I thought that ball_type field was supposed to be a fucntion and spent like 10 minutes swearing and fighting the submission system :D
You need to work on your test cases - I just returned 26 from the dot() function and it passed the final submission. Other than that, this is a fun kata.
Nice one
Loved this one!