Top "Typeclass" questions

Why can I not make String an instance of a typeclass?

Given: data Foo = FooString String … class Fooable a where --(is this a good way to name this?) toFoo :: a …

haskell ghc typeclass type-systems

Confused by the meaning of the 'Alternative' type class and its relationship to other type classes

I've been going through the Typeclassopedia to learn the type classes. I'm stuck understanding Alternative (and MonadPlus, for that matter). …

haskell typeclass

What's the "|" for in a Haskell class definition?

I can't figure out what the "| m -> w"-part means in a class definition like this: class (Monoid …

haskell syntax typeclass