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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.
I think doing a reduce on every pass through the loop is pretty pointless. We're only interested in the sum of each side, and it only changes by the value of the element that the pointer moves through, so re-adding everything up is a big waste.