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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.
So what's better then?
Since this is a beginner level exercise I don't think there is any point in beeing so rude.
Most people completing this exercise won't even know how efficent code is supposed to look like - as myself as well.
Your comment would be usefull if you could elaborate why using sum() twice is bad.