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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.
This should definitely not be an 8kyu as it leaves no obvious argument to reference and is very unfriendly to new coders. The actual problem is very easy to solve if this were just a function with clear parameters and not a method on the string prototype.