[Haskell-cafe] Re: do we need types?

A type is, well, a type. A type class is a relation between types. The confusion probably comes from OO programming where (interfaces) describe unary relations (= one parameter type classes). (begin rant) I wouldn't easily give up algebraic data types just because OO programmers don't seem know about them - so the re-invent them and call it "composite" pattern...