Object is a sufficiently generic term, so that it can mean very different things to different people. Lumping state with some functions that implicitly have R/W access to that state is not possible in Haskell, not even with the powerful type-classes. Thankfully.
Type-classes do allow interesting polymorphism tricks, that —as Wadler mentioned— allows Haskellers to use some of good parts of OO.
Type-classes do allow interesting polymorphism tricks, that —as Wadler mentioned— allows Haskellers to use some of good parts of OO.