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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.
what's the point of the restrictions? You're enforcing the use of rather "raw" stuff (see Steffan's solution) that nobody wants to use ones they know about more evoluated syntaxes => I'm really wondering about the point behind the kata?
Ruby naming conventionn is snake_case, not camelCase
Needs random tests.