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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.
This solution is at least 10 years old.
Great,concise code! However we're not in 2014 anymore so there is no need for 'var' anymore besides some extreme edge cases.