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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 not as concise as the accepted "best practice", this version executes in O(n) time. The submissions using sort() execute in O(n log n) time, making them less optimal for large datasets.
This is by far the most performant and elegant solution.