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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.
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Making the cache private is a bizzare "extra challenge". I can't see how that provides any better functionality/encapsulation, if anything it just makes it harder to understand.
Ruby has the same "problem". However, a proper solution can be written in one line too.
On the other hand, this is an old kata, which are usually overrated compared to recent ones, and the difficulty cannot be changed anymore.
Take the easy points and carry on :-)
yes