How do I create a type class in Haskell?

How do I create a type class in Haskell?

To create a type class in Haskell, you use the class keyword followed by the class name and its type variables. For example:

class MyClass a where
    myFunction :: a -> String

Can you give me an example of implementing a type class?

Sure! Here's an example of implementing the MyClass type class for the Int type:

instance MyClass Int where
    myFunction x = "The number is: " ++ show x

What if I want to create a type class with multiple functions?

You can define multiple functions in a type class by simply adding them in the class definition. For example:

class MyClass a where
    myFunction1 :: a -> String
    myFunction2 :: a -> Int

How do I use the functions from the type class?

You can use the functions by creating instances of the type class for your types. For example:

instance MyClass Int where
    myFunction1 x = "The number is: " ++ show x
    myFunction2 x = x * 2