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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.
It is just a question of form. Eventually this code is equivalent to this one: https://www.codewars.com/kata/reviews/5264d41ce218b86cb90000df/groups/5635e6f949adc7bdad000015
(I mean, both codes not only return the same result, they do exactly the same operations in same order). Unless I misunderstood your question.