What are type classes and instances in Haskell?
An example of an AI chatbot conversation about Haskell type classes and their instances.
What are type classes and instances in Haskell?
Type classes in Haskell are a way to define a set of functions that can operate on different types. An instance is a specific implementation of a type class for a particular type.
Can you give me an example of a type class and its instance?
Sure! The Eq type class is used for types that support equality testing. For example, you can create an instance of Eq for a custom data type like Point.
How do I define an instance for my custom type?
You define an instance by using the instance keyword followed by the type class and the type. For example: instance Eq Point where ....
What happens if I don't define an instance for a type?
If you don't define an instance for a type, you won't be able to use the functions associated with that type class for that type.
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