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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 see this answer has a few ups for best practices, can anyone explain why this would be a best practice solution? I can definitely see clever, but typically part of best practice is readability!
The only thing I would fix, if you are going to do a check for 0 in the denominator, you should do that before you do the division!