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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 completely misunderstood your comment about change of input parameter (e.g. mutating the input array), and really appreciate your new test for it!
Can you give me an example of what you mean?
done and done