Hi folks,
I have a question to the State Monad or Monads in general - I'am not sure.
Lets assume I have functions to transform strings. I can use the State
Monad as follows:
strTrans :: String - String
strTrans s = s ++ s
f :: State String ()
f = do put hallo
modify strTrans
Am Mittwoch, 3. Mrz 2004 14:44 schrieb Georg Martius:
[...]
Now I have also functions to map from (a, String) - (a,String). I could
write:
modifyT :: ((a, String) - (a, String)) - a - State String a
modifyT trans a = do str - get
let (a', str') = trans (a, str)
hi,
Georg Martius wrote:
Now I have also functions to map from (a, String) - (a,String).
I could write:
modifyT :: ((a, String) - (a, String)) - a - State String a
modifyT trans a = do str - get
let (a', str') = trans (a, str)
put str'
return a'
f ::
Am Mittwoch, 3. Mrz 2004 18:15 schrieb Georg Martius:
Thanks for your answer. I got it now.
It works with lift instead of liftM.
Yes, of course.
Georg
Wolfgang
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Georg Martius wrote:
[...]
I could write:
modifyT :: ((a, String) - (a, String)) - a - State String a
modifyT trans a = do str - get
let (a', str') = trans (a, str)
put str'
return a'
f :: State String ()
f = do put hallo
modify strTrans
i -
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i know that
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especially the
