What are advanced concepts in Haskell functors?

Can you explain some advanced concepts related to functors in Haskell?

Sure! Advanced concepts in Haskell functors include the use of higher-kinded types, functor composition, and the Applicative and Monad type classes.

What is functor composition and how is it used?

Functor composition allows you to combine multiple functors into a single functor. This is useful for chaining operations across different contexts.

Can you give an example of functor composition?

Absolutely! If you have two functors, Maybe and [] (list), you can compose them to create a Maybe [a], allowing you to work with lists that may or may not contain values.

How do Applicative and Monad relate to functors?

Both Applicative and Monad are extensions of functors. While a functor allows you to apply a function to a wrapped value, Applicative lets you apply functions that are also wrapped, and Monad provides a way to chain operations on wrapped values.