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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.
The >0 is not meant for a a negative number. It's meant for an empty array where length would be 0.
Best solution but array.length will never be negative. Just write {return arr.length ? :} and that would be it (: