Loading collection data...
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.
That returns a new array tho. It doesn't reverse it in place.
If you failed one, then your code is wrong and it didn't pass all the random tests.
Without more info there's nothing we can do.