State Monad

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The State Monad by Example

This is a short tutorial on the state monad. Emphasis is placed on intuition. The types have been simplified to protect the innocent.


runState (return 'X') 1



   initial state = 1 :: Int
   final value = 'X' :: Char
   final state = 1 :: Int
   result = ('X', 1) :: (Char, Int)