What is fmap in Haskell?
An example of an AI chatbot conversation about fmap in Haskell, a function for mapping over functors.
Can you explain what fmap does in Haskell?
Sure! fmap is a function that applies a function to a value wrapped in a functor, like Maybe or List.
Can you give me an example of how to use fmap?
Of course! If you have a Maybe value, like Just 5, and you want to add 3, you can use fmap like this: fmap (+3) (Just 5) which results in Just 8.
What happens if I use fmap on Nothing?
If you use fmap on Nothing, like fmap (+3) Nothing, it will simply return Nothing.
Is fmap only for Maybe, or can it be used with other types?
fmap can be used with any functor, including Lists, Either, and more. It's a very versatile function!
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