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.
It would be nice to provide at least on test case as an example.
Given that one example is already given in the description this should be relatively easy.
I also suggest to provide expected outcomes for these input values: empty array and single element array - maybe even nil.