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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.
Not an issue - int is a value type, meaning p is passed by value and not by reference. So you can mutate it all you like inside the method and it will not affect the original parameter from the caller's perspective.