[Haskell-cafe] Doubting Haskell
Anton van Straaten
anton at appsolutions.com
Sun Feb 17 02:46:10 EST 2008
Colin Paul Adams wrote:
>>>>>> "Cale" == Cale Gibbard <cgibbard at gmail.com> writes:
> Cale> So, the first version:
> Cale> import System.IO import Control.Exception (try)
> Cale> main = do mfh <- try (openFile "myFile" ReadMode) case mfh
> Cale> of Left err -> do putStr "Error opening file for reading: "
> Cale> print err Right fh -> do mline <- try (hGetLine fh) case
> Cale> mline of Left err -> do putStr "Error reading line: " print
> Cale> err hClose fh Right line -> putStrLn ("Read: " ++ line)
> Left? Right?
> Hardly descriptive terms. Sounds like a sinister language to me.
I was thinking along the same lines. Politically-sensitive left-handed
people everywhere ought to be offended that "Left" is the alternative
used to represent errors, mnemonic value notwithstanding.
Is there a benefit to reusing a generic Either type for this sort of
thing? For code comprehensibility, wouldn't it be better to use more
specific names? If I want car and cdr, I know where to find it.
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