What are functors in Haskell and how do I use them?
An example of an AI chatbot conversation about functors in Haskell and their practical applications.
What are functors in Haskell and how do I use them?
Functors in Haskell are types that can be mapped over. They allow you to apply a function to values wrapped in a context, like lists or Maybe types.
Can you give me an example of a functor in practice?
Sure! A common example is the Maybe type. You can use fmap to apply a function to the value inside a Maybe, if it exists.
How does fmap work with Maybe?
The fmap function takes a function and a Maybe value. If the Maybe is Just x, it applies the function to x. If it's Nothing, it returns Nothing.
What are some other functor examples in Haskell?
Other examples include lists, Either, and IO. Each of these types implements the Functor typeclass, allowing you to use fmap.
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