On Thu, Dec 23, 2010 at 11:25 PM, Tony Morris
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...regardless of the utility of a contravariant functor type-class, I strongly advocate for calling it Contrafunctor and not Cofunctor. I have seen numerous examples of confusion over this, particularly in other languages.
I don't personally care what's it called, as long as it's available. Can anybody point to an authoritative source for the terminology, though? Wikipedia claims that cofunctor is a contravariant functor. Also, is there anything in category theory equivalent to the Functor -> Applicative -> Monad hierarchy , but with a Cofunctor/Contrafunctor at the base? I'm just curious, I'm not advocating adding the entire hierarchy to the base library. ;)