[Haskell-cafe] Conditional IO ?

[Eugene Kirpichov]

| otherwise = return ()

or:

handleParseErrors errors = when (not . null $ errors) $ writeFile .....

2011/6/20 Dmitri O.Kondratiev <dokondr at gmail.com>:
> Hi,
> What is right way to do conditional IO?
> For example, I need to write to file errors only in case they exist,
> otherwise my function should do nothing:
>
> handleParseErrors errors
>   | (not . null) errors =  writeFile "parse-errors.txt" (show errors)
>   | otherwise = ?
>
> What should be an 'otherwise' case ?
>
> Thanks!
>
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-- 
Eugene Kirpichov
Principal Engineer, Mirantis Inc. http://www.mirantis.com/
Editor, http://fprog.ru/