How can I handle errors in Haskell using type classes?

How can I handle errors in Haskell using type classes?

In Haskell, you can use type classes to define a common interface for error handling. For example, you can create a type class called ErrorHandler that defines methods for handling errors.

Can you show me an example of such a type class?

Sure! Here's a simple example:

class ErrorHandler e where
    handleError :: e -> String

instance ErrorHandler String where
    handleError err = "Error: " ++ err

instance ErrorHandler Int where
    handleError err = "Error code: " ++ show err

How do I use this type class in my code?

You can use the handleError method to handle errors in a polymorphic way. For instance:

process :: ErrorHandler e => e -> String
process err = handleError err

What if I want to add more error types later?

You can easily extend the ErrorHandler type class by creating new instances for different error types, allowing for flexible error handling.