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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.
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This is a great Kata that has multiple solutions and approaches in Javascript, was impressed with the solutions presented by other members.
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I agree, extra basic tests would have helped..
Can change good.split(' ') to good.split