Created
August 3, 2011 13:39
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fizzbuzz :: Int -> String | |
fizzbuzz n = unlines $ map fizzbuzz' [1 .. n] | |
where | |
fizzbuzz' n = let p = n `mod` 3 == 0 | |
q = n `mod` 5 == 0 | |
in case (p, q) of | |
(p, q) | p && q -> "FizzBuzz" | |
| p -> "Fizz" | |
| q -> "Buzz" | |
| otherwise -> show n | |
main = putStr $ fizzbuzz 50 |
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fizzbuzz :: Int -> String | |
fizzbuzz n = unlines $ map fizzbuzz' [1 .. n] | |
where | |
fizzbuzz' n = f $ fizz ++ buzz | |
where | |
fizz = if n `mod` 3 == 0 then "Fizz" else "" | |
buzz = if n `mod` 5 == 0 then "Buzz" else "" | |
f [] = show n | |
f (x:xs) = (x:xs) | |
main = (putStr . fizzbuzz) 100 |
fizzbuzz4.hs:
fizzbuzz :: Int -> String
fizzbuzz n = unlines $ map fizzbuzz' [1 .. n]
where
fizzbuzz' n = defaultTo (show n) $ concat $ consIf (n `mod` 3 == 0) "Fizz" $ consIf (n `mod` 5 == 0) "Buzz" $ []
consIf :: Bool -> a -> [a] -> [a]
consIf False _ xs = xs
consIf True x xs = x : xs
defaultTo :: [a] -> [a] -> [a]
defaultTo ys [] = ys
defaultTo _ xs = xs
main = putStr $ fizzbuzz 50
I think that consIf
and defaultTo
can be useful in other circumstances.
Thanks for the tip! It became more simple. :)
They were my first Haskell programs..
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fizzbuzz3.hs (based on fizzbuzz1.hs):