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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.
While concise, solutions based on Array#any? have the advantage of being fail-fast.
Hash.new(default_value) != Hash.new
This solution passes the kata, but with it, if you go result = solution([], default_value) then result['not a key'] will still evaluate to default_value, which is NOT what you might expect in most circumstances.