What is a Functor in Haskell?
An example of an AI chatbot conversation about Functors in Haskell programming.
What is a Functor in Haskell?
A Functor in Haskell is a type class that allows you to apply a function over wrapped values, like lists or Maybe types.
Can you give me an example of a Functor in action?
Sure! For instance, if you have a list [1, 2, 3] and you want to add 1 to each element, you can use fmap (+1) [1, 2, 3], which results in [2, 3, 4].
What are the laws that Functors must obey?
Functors must obey two laws: the identity law and the composition law. The identity law states that fmap id = id, and the composition law states that fmap (f . g) = fmap f . fmap g.
How do Functors relate to other type classes in Haskell?
Functors are a foundational concept in Haskell, and they relate to other type classes like Applicative and Monad, which build on the Functor concept.
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