[Haskell-cafe] Mapping string to a function
freizl at gmail.com
Thu Mar 15 07:21:37 CET 2012
Thanks Oliver. That's good enough.
I was ever curious about whether parse String to the function rather
than a mapping.
On Thu, Mar 15, 2012 at 1:26 PM, Oliver Batchelor <saulzar at gmail.com> 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 <freizl at gmail.com> 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-seq.hs
>> I'm wondering it can be done simply in haskell.
>> Thanks a lot.
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