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Today's Topics:
1. Re: exception, not in IO (Lyndon Maydwell)
----------------------------------------------------------------------
Message: 1
Date: Sun, 14 Jul 2013 20:30:32 +1000
From: Lyndon Maydwell <[email protected]>
Subject: Re: [Haskell-beginners] exception, not in IO
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
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<cam5qztz7z_1zpgjiyvennqqdtamxbcj+1eamfkmtz+6nu0a...@mail.gmail.com>
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You can turn anything into an IO action with return, or you could catch the
exception at a level where you are performing IO. Would this be what you're
after?
On Sun, Jul 14, 2013 at 7:47 PM, Kees Bleijenberg <
[email protected]> wrote:
> The app I?am working on, converts a jsonString to another string encoding.
> ****
>
> The function I want to write is jsonString -> (encoding, errorMsg) so
> String-> (String, String) ****
>
> For this purpose I have a typeable datastructure Glass. Because it is
> typeable I can do (decodeJSON jsonString) :: Glass****
>
> But sometimes the jsonString is not valid (misformed or wrong fields).
> decodeJSON then throws a exception. I want to****
>
> catch that exection and transform the result to something like (?? ,
> theErrorMsg). Unfortunately all catch functions want IO parameters. ****
>
> What can I do?****
>
> ** **
>
> Kees****
>
> ** **
>
> _______________________________________________
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