Created
July 30, 2019 12:27
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| #!/usr/bin/env stack | |
| -- stack --resolver lts-11.11 --install-ghc runghc | |
| {-# LANGUAGE ScopedTypeVariables #-} | |
| import Data.Foldable | |
| import Data.Maybe (fromMaybe) | |
| type FizzRule = Integer -> Maybe String | |
| rule :: Integer -> String -> FizzRule | |
| rule n m i = | |
| case i `mod` n of | |
| 0 -> Just m | |
| _ -> Nothing | |
| fizz :: FizzRule | |
| fizz = rule 3 "Fizz" | |
| buzz :: FizzRule | |
| buzz = rule 5 "Buzz" | |
| fizzBuzz :: (Functor f, Foldable t) | |
| => t (Integer -> Maybe String) | |
| -> f Integer | |
| -> f String | |
| fizzBuzz rules = fmap (fromMaybe <$> show <*> ruleSet) | |
| where | |
| ruleSet = fold rules | |
| main :: IO () | |
| main = do | |
| putStr "Provide some integer: " | |
| (n :: Integer) <- read <$> getLine | |
| let res = fizzBuzz [fizz, buzz] [1..n] | |
| mapM_ putStrLn res |
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