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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.
where n is always 10 and thus it's O(1)
Each call to filter creates a new array in memory, resulting in O(n) space complexity in the worst case.