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.
A little too late, but because join returns a string, it doesn't transform the array to a string.
You don't seem to be checking for a null (or your language's equivalent) input. I don't think you can sort() nothing :)