Haskell: hIsReadable: Check whether file handle is readable or not

hIsReadable takes a file handle and return IO True, if the handle is readable, else IO False.

Prelude System.IO> :t hIsReadable

hIsReadable :: Handle -> IO Bool

FileUtil.hs

import System.IO

main = do
        putStrLn "Enter file name (Including full path) to read"
        fileName <- getLine
        fileHandle <- openFile fileName ReadMode

        isReadable <- hIsReadable fileHandle
        isWritable <- hIsWritable fileHandle

        putStrLn $ "Is file handle readable " ++ show isReadable
        putStrLn $ "Is file handle writable " ++ show isWritable

$ runghc FileUtil.hs
Enter file name (Including full path) to read
today.txt
Is file handle readable True
Is file handle writable False

Previous                                                 Next                                                 Home