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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 agree with you, but it's just not in the "clever" category.
The other solutions use slice().reduce() which copies the values into a new array and then reduces the new array into a single value. A second loop like this is most likely faster.
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