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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.
Rust translation
Scala translation
Although possible to solve without it, it may be best to change the ADT in the Kata from
to
At least in the Haskell version, I suggest having (visible, non-solution) test cases that verify the "wrap around" behavior.
I added these to my own tests when working this kata: