Hi all, I have a list of entries for a directory (FilePaths) and I'd like to partition them into files and directories using Data.List.partition: partition :: [a] -> ([a], [a]) Now, one solution is to use unsafePerformIO: splitDirFile :: [FilePath] -> ([FilePath], [FilePath]) splitDirFile paths = do partition (\p -> unsafePerformIO (doesDirectoryExist p)) paths Two questions: a) Is it possible to do this without invoking unsafePerformIO? Ie with a function signature of say: partition :: [FilePath] -> IO ([FilePath], [FilePath]) b) Exactly how unsafe is the unsafePerformIO version? Erik -- ----------------------------------------------------------------- Erik de Castro Lopo ----------------------------------------------------------------- The main confusion about C++ is that its practitioners think it is simultaneously a high and low level language when in reality it is good at neither.