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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.
Until this moment I thought my code is good. Damn you, kayakero!
Not unless the kata explicitly asks you to solve the problem without using this very method.
But that would really defeat the concept of doing the kata, wouldn't it?
IntStream has method avrerage(), so it should by solved by: Arrays.stream(i).average()