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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.
Thank you for bringing this to my attention. I have made changes to the kata to emphasize its uniqueness by tripling the negative numbers before summing them. This modification sets it apart from the existing kata.
Duplicate: https://www.codewars.com/kata/5715eaedb436cf5606000381
Awesome