[Haskell-cafe] How to solve this problem?It's quite easy in PHP.

[Lennart Augustsson]

Using printf doesn't need Haskell'.  I wrote to require only Haskell98.

	-- Lennart


On Feb 14, 2007, at 11:36 , Neil Mitchell wrote:

> Hi
>
> Eeek, a solution that does monadic maps and require's rank 2 types!
>
> arr = [('a',1), ('b',2), ('c',3)]
> showAll = lines (map showItem arr)
> showItem (a,n) = a : " = " ++ show n
> main = putStr showAll
>
> I've broken this up a bit more than usual - most people would probably
> just put showAll inside main, but this separates out the concepts. arr
> is the data, which you could construct with a zip if that really is
> all there is to it. showItem shows a single item, showAll shows them
> all, and main just prints out the information.
>
> And this solution is Haskell 98, anything that uses printf is  
> Haskell' only.
>
> Thanks
>
> Neil
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