Re: [Haskell-cafe] Haskell vs OCaml

From: Matt Collins To: "Branimir Maksimovic" CC: Haskell-Cafe@haskell.org Subject: Re: [Haskell-cafe] Haskell vs OCaml Date: Sun, 25 Dec 2005 21:42:35 +1100

Perhaps something like

for :: Int -> Int -> (Int -> IO ()) -> IO () for begin end f = sequence_ [ f i | i <- [begin..end] ]

*Main> for 1 10 print 1 2 3 4 5 6 7 8 9 10

Great! what are constrains on [begin..end] could they be some type which supports (+) , but not Int. I need this cause perhaps there is possibility to impleemnt STL like algo's in Haskell and that would be even better then C++, cause Haskell has more powerfull parametric polimorfism and C++ badly needs lambda's. That's why STL is somewhat ugly, but lib tried to employ functional style programming over sequences and is not bad, though in C++ one has to make lot of auxiliary classes because of lack of lambda's. If I can make Iterator generic class and specialize for different containers that would be it. Last question is: Does creation of list of functions humpers performance? Greetings, Bane.

On 25/12/2005, at 9:35 PM, Branimir Maksimovic wrote:

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From: Lennart Augustsson To: Branimir Maksimovic CC: daniel.carrera@zmsl.com, Haskell-Cafe@haskell.org Subject: Re: [Haskell-cafe] Haskell vs OCaml Date: Sun, 25 Dec 2005 10:25:44 +0100

Branimir Maksimovic wrote:

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I've found that Haskell is pretty good in implementing recursive algorithms. Problem cames when one want's to implement non recursive algorithm by terms of recursion as Haskell does not support loops. Perhaps if we can get loops, situation will improve, but then that wouldn't be functional style.

Could you give an example of a loop you find awkward in Haskell?

Well I want simple loop for(int i =0;i<10;++i)doSomething(i); in haskell that would be for begin end f | begin /= end = do {f begin ; for (begin+1) end f} | otherwise = return ()

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I've often found that you can just define a control construct in Haskell when needed (e.g., some kind of loop).

I don't know how to do that.

Greetings, Bane.

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