main :: IO ()
main = putStrLn "Hello, World!"

-- Functors are a class of data structure that "contain" a generic type
-- you can "inject" functions inside these functors with `fmap`
-- Applying a function "inside" of a functor will not change the structure
-- of the functor
-- e.g `fmap (\x -> x + 1)` [1..10] will not change the length of the list
-- Functors require an implentation of `fmap`
fmap :: Functor f => (a -> b) -> f a -> f b
-- and have to obey the functor laws:
-- fmap id = id
-- fmap (f . g) = fmap f . fmap g

 {-	it's a functional programming language	start here -} https://www.haskellfromtheverybeginning.com/

{- One expression of the belief is “everything is a function” in Haskell. ... A recurring answer is that such things are “functions of no arguments” or functions of a one-element type or “constant functions”.
-}
-- A sample function
factorial :: (Integral a) => a -> a
factorial 0 = 1
factorial n = n * factorial (n - 1)

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