Re: [Haskell-cafe] printing a list of directories which don't exist

On Wed, 14 May 2008, Mike Jarmy wrote:

Newbie question: Given a list of type '[FilePath]', how do I create a list of all those directories which do not actually exist, and then print the list? I've figured out how to extract the ones which *do* exist, like so:

module Main where

import Control.Monad (filterM) import System.Directory (doesDirectoryExist) import System.Environment (getArgs)

main :: IO () main = do dirs <- getArgs let existing = filterM doesDirectoryExist dirs

should be

existing <- filterM doesDirectoryExist dirs

I think.