Thanks Oliver. That's good enough. I was ever curious about whether parse String to the function rather than a mapping. -Haisheng On Thu, Mar 15, 2012 at 1:26 PM, Oliver Batchelor wrote:

You could store your test data in a named map e.g.

import qualified Data.Map as M import System

testSets :: M.Map String [Int] testSets = M.fromList    [  ("testdata",   testdata)    ,  ("testdata2", testdata2)    ]

f :: Int -> Something f = ....

main = do  [arg] <- getArgs

 case M.lookup arg testSets of      Just testSet -> print (map f testSet)      Nothing        -> print "Test set not found!"

On Thu, Mar 15, 2012 at 12:59 PM, Haisheng Wu wrote:

...

Hi there,  Do you have any comments / suggestions for the following scenario?

 I have two list and a function over list  testdata :: [Int]  testdata2 :: [Int]  f testdata = map g testdata

 What I like to do is choosing what test data via command line arguments.  i.e. test.hs testdata2 will run against testdata2

 I could make it using pattern match between argument and data definition but it is annoy.  code here: https://github.com/freizl/dive-into-haskell/blob/master/sandbox/one-in-arith...

 I'm wondering it can be done simply in haskell.

 Thanks a lot. -Haisheng

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