Haskell Cookbook

How to do it...

1. Create a new project io-monad with the simple Stack template:

        stack new io-monad simple

2. Open src/Main.hs; we will be editing this file.

3. After initial module definition, add the following imports. Only those functions that are used in the program are imported from the corresponding module:

        import System.IO (hGetLine, hIsEOF, withFile, Handle,         IOMode(..))        import System.Environment (getArgs)        import Control.Monad        import Data.List (intercalate)

4. Write the function getLineSeq, which returns a list of lines when given a file handle:

         -- From the file handle, check if we have reached end of file,         -- otherwise read the file line by line         getLinesSeq :: Handle -> IO [String]         getLinesSeq h = do         eof <- hIsEOF h -- Use (:) to ...