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 < k.bleijenberg@lijbrandt.nl> 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?****
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Kees****
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