Haskell

[Andrew Stribblehill]

Quoting Law <lawer@lineone.net>:
> hi, how do I define this function:
> 
> tupleWithf :: [Int] -> [(Int, Int)]
> 
> such that 
> 
> tupleWithf [x1,x2,.....,xn]
> = [ (f x1, x1), (f x2 x2),...., (f xn, xn) ]
                       ^ you wanted a comma there, I guess.

I don't see where you're getting `f' from. I think you want the type
to be:

tupleWithf :: (Int -> Int) -> [Int] -> [(Int, Int)]

Still, you can do this with a trivial list comprehension or map. I
leave the implementation as an exercise for the reader.

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