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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 realized after submitting that I was editing the array that is passed rather than creating a new array with-in the function to manipulate. Which is bad if you want the array you pass to the function to be kept as it is while still returning the solution. I think there should be a test case that makes sure you don't edit the array being passed so solutions like these don't pass.