Probably you might need the "zip" function.Check here:http://haskell.org/ghc/docs/latest/html/libraries/base/Prelude.html#v:zip

Date: Tue, 9 Jun 2009 06:05:57 -0700 From: ptrash@web.de To: haskell-cafe@haskell.org Subject: [Haskell-cafe] Combine to List to a new List

Hi,

I have the following two lists:

a = [1,2,3] b = ["A","B","C"]

I want a combination of the to lists:

c = [(1,"A"), (2, "B"), (3, "C")]

How can I do this?

I have tried

c = [(x,y) | x <- a, y <- b]

But this just returns me a list with every possible combination of the 2 lists.

Thanks...

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On Tue, 2009-06-09 at 06:05 -0700, ptrash wrote:

Hi,

I have the following two lists:

a = [1,2,3] b = ["A","B","C"]

I want a combination of the to lists:

c = [(1,"A"), (2, "B"), (3, "C")]

How can I do this?

What you want is a function with the following type signature: [t1] -> [t2] -> [(t1,t2)] Search for that in hoogle[1] and you get the function "zip" as a result[2] (as already told in this thread). Hoogle is your friend (and helps you help yourself)! :) 1: http://haskell.org/hoogle/ 2: http://haskell.org/hoogle/?hoogle=%5Ba%5D+-%3E+%5Bb%5D+-%3E+%5B%28a% 2Cb%29%5D