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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.
A good kata, but I feel like allowing this is a problem: https://www.codewars.com/kata/reviews/5e36ce74fc5a260001e64e2b/groups/5e47b5b54f4fe30001c2a5d8
Is this kind of solution allowed? At least I don't think so.
Sometimes
NaNis generated in random tests.nullorzero?