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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.
Why do people upvote this as "best practices"? This is a O(n^2) solution for a problem that can be solved in linear time.
While this deinitely works and looks neat, it is not a "best practices" solution. Sorting is an expensive operation is completely unnecessary in this case.