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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.
You are correct. names.sort! will modify the original list, which is probably not what is desired by this method.
As far as I'm aware, this will also change the array passed into the function, rather than just returning a sorted version.