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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.
"any?" can be defined with "not", "all?", "empty?", without using any advanced technique.
Having a circular mindset leaves you learning nothing, not only in programming but in other domains as well.
Circular implementation!
That's cheating, using Ruby's internal "any" to implement your "any".