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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.
The description should specify that the goal is to return the central element, as opposed to the central index. Also, as others have pointed out the problem is extremely simple. Maybe allow empty and/or even-length arrays as inputs and provide instructions for how the function should deal with them.
Good point - I've changed it to test the whole range. Thanks!