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Diffstat (limited to 'entries/zgrannan/Fib.hs')
-rw-r--r-- | entries/zgrannan/Fib.hs | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/entries/zgrannan/Fib.hs b/entries/zgrannan/Fib.hs new file mode 100644 index 0000000..1918fc8 --- /dev/null +++ b/entries/zgrannan/Fib.hs @@ -0,0 +1,18 @@ +-- Point-less fibonacci +fib :: Int -> Int +fib = fix fib' + where + fib' = + ap (when 0 . (0 ==)) . + ap (when 1 . (1 ==)) . + ap (ap . ((+) .) . (. subtract 1)) (. subtract 2) + + when t c e = if c then t else e + + ap mf m = mf >>= (\f -> m >>= return . f) + + fix f = f (fix f) + + +main :: IO () +main = mapM_ (print . fib) [0 .. 10] |