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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 reversing is meant to be done in-place:
reverses the order of the items in the array it is called on, and then returns that same array. So the original array is reversed, then the original array is returned. It is a difficult thing to describe, so I've had this problem a lot. I'll try to reword.You will have to return your solution for the function to work properly.