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's because at some point you're returning undefined.
Ok, I'll put this in the description!
I agree, it should specify whether it was sorted or not - I did it assuming the input array was unsorted.