What are type classes in Haskell and how can they be used in design patterns?

What are type classes in Haskell?

Type classes in Haskell are a way to define a set of functions that can operate on different types. They allow for polymorphism, enabling you to write generic code that works with any type that implements the type class.

Can you give me an example of a type class?

Sure! A common example is the Eq type class, which defines equality. Any type that implements Eq must provide an implementation for the == and /= operators.

How do type classes relate to design patterns?

Type classes can be used to implement design patterns like Strategy or Visitor. They allow you to define a common interface for different types, enabling flexible and reusable code.

What are some design patterns that benefit from using type classes?

Some design patterns that benefit from type classes include Strategy, Visitor, and Factory patterns. They enhance code modularity and reusability.