in addition, a good example of how to apply quickcheck would be really awesome. without using the standard drop <g>
On 2/26/07, Thomas Hartman <[EMAIL PROTECTED]> wrote:
Here's my, probably very obvious, contribution. What I'd like feedback on is 1) code seem ok? (hope so!) 2) What do you think of the tests I did to verify that this behaves the way I want? Is there a better / more idiomatic way to do this? ********************************************** [EMAIL PROTECTED]:~/learning/haskell/lists$ cat drop.hs mydrop :: Int -> [Int] -> [Int] mydrop 0 xs = xs mydrop n xs = mydrop (n-1) (tail xs) main = test test = do print test1 print test2 print test3 test1 = mydrop 3 [1,2,3] == [] test2 = mydrop 2 [1,2,3] == [3] test3 = mydrop 0 [1,2,3] == [1,2,3] [EMAIL PROTECTED]:~/learning/haskell/lists$ runghc drop.hs True True True 2007/2/26, iliali16 <[EMAIL PROTECTED]>: > > Hi I am trying to implement the function drop in haskell the thing is that I > I have been trying for some time and I came up with this code where I am > trying to do recursion: > > drop :: Integer -> [Integer] -> [Integer] > drop 0 (x:xs) = (x:xs) > drop n (x:xs) > |n < lList (x:xs) = dropN (n-1) xs : > |otherwise = [] > > So I want to understand how would this work and what exacttly should I put > as an answer on line 4 couse that is where I am lost. I know I might got the > base case wrong as well but I don't know what to think for it. I have done > the lList as a function before writing this one. Thanks to those who can > help me understand this. Thanks alot in advance! Have a nice day! > -- > View this message in context: http://www.nabble.com/Hi-can-u-explain-me-how-drop-works-in-Haskell-tf3290490.html#a9152251 > Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com. > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
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