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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 is this a best practice? Sorting complexity for sorting is about and is O(n * log(n)) and just iterating through the array will take O(n) that faster and simplier, e.g. for 1 billion array list the number of iteration for sorting will be about 30 billions.