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.
Yes, if you print the value to the console but the recursion came back as undefined is because you aren't returning the call to the function normally.
You're doing recursion wrong.
Don't modify the input.