Haskell function

{-
  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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