Manfred Wrote:
Hmm, not quite sure I'm understanding why Data.Map would help.
What I want to have is something like the following without the verboseness of it:
-- this is a minimal example. -- Assume I would have some 15 such values. a = "bla" b = "bla2"
valList = [ a, b ]
Now in my program on the one hand I want to do something with all values, thus: map doSomething valList
On the other hand I frequently want use single values in my program, like e.g.: let x = "suffix " ++ a
What I don't want to do is to write a definition like valList because if I add a new value I have to remind myself not to forget to add it to valList too.
Hi Manfred, I think that the Map type is about the best you are going to get. (I am a beginner, so take my advice with a few grains of salt.) Here is some code that does something like what you want. -- Start Code import Data.Map as M -- Makes a Map m1 = M.fromList [('a', "bla"), ('b', "bla2"), ('c', "bla3")] -- Function for looking up values in m1 look c = M.findWithDefault "fail" c m1 valList = M.keys m1 showSuffix = "suffix " ++ look 'a' -- Add three ! to the end of every string in m1 m2 = fmap ( ++"!!!") m1 -- Add a new key-value pair m3 = M.insert 'd' "blabla" m2 -- End Start Code Cheers, Hein