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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.
it's passed by reference because pointers are cheaper and faster than making a copy; and it's a
constreference because the function does not need to, and should not, modify its input.my question is why the h is passed by refrence, and why it is also constant?