Difference between revisions of "Haskell Quiz/FizzBuzz/Solution Syzygies"
< Haskell Quiz | FizzBuzz
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| − | Fizz comes before Buzz comes before an integer. Fizz and Buzz stick to each other, but hide integers. |
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| − | The lists for Fizz and Buzz are infinite, but zipping together with a finite list of integers, the result is finite. |
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| − | <haskell> |
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| − | module Main where |
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| − | main :: IO () |
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| − | main = mapM_ putStrLn $ zipWith3 join (loop 3 "Fizz") (loop 5 "Buzz") [1..100] |
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| − | where |
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| − | xor s t = if null s then t else s |
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| − | loop n s = cycle $ replicate (n-1) [] ++ [s] |
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| − | join s t n = xor (s ++ t) (show n) |
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| − | </haskell> |
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| − | If one has enabled all warnings as errors, then the integers need an explicit type, as shown below. |
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| − | The hiding logic can also be implemented by filtering for the first non-null element of a list: |
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| − | <haskell> |
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| − | module Main where |
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| − | module Main where |
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| − | main :: IO () |
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| − | main = sequence_ $ zipWith3 join (loop 3 "Fizz") (loop 5 "Buzz") [1..100 :: Int] |
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| − | where |
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| − | loop n s = cycle $ replicate (n-1) "" ++ [s] |
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| − | join s t n = putStrLn . head $ filter (not . null) [s ++ t, show n] |
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| − | </haskell> |
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