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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 love the usage of the lambda. It breaks up the logic a bit and makes it slightly more readable.
The downfall of this solution, though it is clever, is scalability. The rules are obviously hardcoded in, and one of them, the rule for 100, isn't exactly intuitive.
Clever solution, but certainly not best practice.