[Haskell-cafe] displaying conetents of a list

[Michael Snoyman]

listFilms = [Film] -> IO ()
listFilms = putStrLn . show -- point free style
listFilms films = putStrLn $ show films
listFilms = mapM_ (putStrLn . show) -- put each movie on a separate line,
point free style
listFilms films = mapM_ (putStrLn . show) films

Hope that makes sense...

Michael

On Sun, May 10, 2009 at 5:30 PM, applebiz89 <applebiz89 at hotmail.com> wrote:

>
> I want to write a function to output the entire contents of a list. not
> sure
> of how to do so...This is my list i want to output
>
> type Title = String
> type Director = String
> type Year = Int
> type Fan = String
>
> data Film = Film Title Director Year [Fan] deriving Show
>
> -- List of films
>
> testDatabase :: [Film]
> testDatabase = [(Film "Casino Royale" "Martin Campbell" 2006 ["Garry",
> "Dave", "Zoe"]) ]
>
> -------
>
> I know this isnt right but this is what I have so far
>
> listFilms :: [Film] -> [Film]
> listFilms (film@(Film title director year fans) : films) = putStrLn . show
> film
>
> I know to use show and putStrLn but I just don't know how to put them into
> the function correctly
>
> thank you.
> --
> View this message in context:
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> Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.
>
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