[Haskell-cafe] how to write a function to send a string to a tuple

[Deniz Dogan]

2010/3/8 Pradeep Wickramanayake <pradeep at talk.lk>:
> Hi,
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>
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> Im having problems with sending a string to a tuple.
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> My string contains integers and strings
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> The whole string stay as (“test,dfdf”,3,”dfsf”)
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> sortList2 :: String -> String
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> sortList2 (x:xs)
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>                 | x == ',' = ""
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>                 | otherwise = [x] ++ sortList2 xs
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>
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> The above function separating each words from the string
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> Now I need to put them to a tuple
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> putList :: String -> (Int, String, String, Int, Int)
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> putList (x:xs)
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>                                                 |xs /="" = sortList2 ++
> putList xs
>
>

I'm not sure what you're doing with the "sorting", but you could sort
of hack it using `read' as such:

Prelude> read "(3, \"hello\")" :: (Int, String)
(3, "hello")

Of course, this will crash if the input string is not parsable.

Prelude> read "(3, 'a')" :: (Int, String)
*** Exception: Prelude.read: no parse

-- 
Deniz Dogan