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Ingy döt Net 2013-04-10 14:58:50 -07:00
parent 2dd7375f96
commit 051504d65b
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7
Task/Anonymous-recursion/Haskell/anonymous-recursion-1.hs Normal file
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fib :: Integer -> Maybe Integer
fib n
| n < 0 = Nothing
| otherwise = Just $ real n
where real 0 = 1
real 1 = 1
real n = real (n-1) + real (n-2)

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Task/Anonymous-recursion/Haskell/anonymous-recursion-2.hs Normal file
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import Data.Function (fix)
fib :: Integer -> Maybe Integer
fib n
| n < 0 = Nothing
| otherwise = Just $ fix (\f -> (\n -> if n > 1 then f (n-1) + f (n-2) else 1)) n

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Task/Anonymous-recursion/Haskell/anonymous-recursion-3.hs Normal file
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ghci> map fib [-4..10]
[Nothing,Nothing,Nothing,Nothing,Just 1,Just 1,Just 2,Just 3,Just 5,Just 8,Just 13,Just 21,Just 34,Just 55,Just 89]