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language:
Haskell (ghc-7.4.1)
date:
444 days 12 hours ago
link:
visibility:
publicprivateuser'sdeleted
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main =doprint$ safeHead ([]::[Int])print$ safeHead ([1,2]::[Int])
safeHead ::[a]->Maybe a
safeHead = partial head(not.null)
partial ::(a -> b)->(a ->Bool)-> a ->Maybe b
partial f p x | p x = Just $ f x |otherwise= Nothing
