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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.
same error :(
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Kata description is a bit misleading. It should be mentioned, that the main object object's properties may also be objects (nesting!). At first I thought there would be no nesting. Moreover you should add an example.
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missing some test :)
only if sum also returns NaN, because I think it's the same case
it's for empty array, test []
Test Failed: Wrong average on empty array, expected NaN -.-
I think is better 0 than NaN