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authorTom Smeding <tom.smeding@gmail.com>2018-04-19 11:45:46 +0200
committerTom Smeding <tom.smeding@gmail.com>2018-04-19 11:45:46 +0200
commitaf425841a63ee73603cc09510d95a36e646ddafd (patch)
tree08a1ef8435ec0ab07887256a1c86f908c2389a1a /utility.hs
parent8d9d27d64d9e39ea76fd878e928e553944735e45 (diff)
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-module Utility where
-
-import Data.List
-
---if any of the predicates returns true, options returns true
-options :: [a -> Bool] -> a -> Bool
-options l x = any id [f x | f <- l]
-
-fixpoint :: (Eq a) => (a -> a) -> a -> a
-fixpoint f x = let fx = f x in if fx == x then x else fixpoint f fx
-
-setcompareBy :: (a -> a -> Bool) -> [a] -> [a] -> Bool
-setcompareBy _ [] [] = True
-setcompareBy _ [] _ = False
-setcompareBy _ _ [] = False
-setcompareBy p a@(x:xs) b = length a == length b && setcompareBy p xs (deleteBy p x b)
-
-deleteIndex :: Int -> [a] -> [a]
-deleteIndex 0 (_:xs) = xs
-deleteIndex i (x:xs) | i > 0 = x : deleteIndex (i-1) xs
-
-fromLeft :: Either a b -> a
-fromLeft (Left a) = a
-fromLeft (Right _) = undefined
-
-fromRight :: Either a b -> b
-fromRight (Left _) = undefined
-fromRight (Right b) = b