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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.
With all due respect, you are not right. Function squareSum() takes one argument, not two. Let me explain: func squareSum([],[1,2,2]) will only look for a first argument, which is [] (empty array), and thus result is 0. Also, if you would to call func squareSum([1,2,2], []), the result would be, as expected, 9.