What are some examples of functors in Haskell?

What are some examples of functors in Haskell?

In Haskell, a functor is a type class that allows you to apply a function over wrapped values. A common example is the Maybe type.

Can you explain how the Maybe functor works?

Sure! The Maybe type can either be Just value or Nothing. Using the fmap function, you can apply a function to the value inside Just.

Are there other functors besides Maybe?

Yes, another example is the List functor. You can use fmap to apply a function to each element in a list.

Can you give me a code example of using fmap with a list?

Certainly! Here's a simple example: fmap (*2) [1, 2, 3] results in [2, 4, 6].