[Haskell-cafe] haskell in online contests

Luke Palmer lrpalmer at gmail.com
Fri Nov 27 23:58:50 EST 2009

On Fri, Nov 27, 2009 at 9:18 PM, vishnu <pathsny at gmail.com> wrote:
> Hi Bulat
>    hmm ok I understand the issue of compiler maturity. But I thought
> lazyness was meant to be a bonus? Or is it that if you really try to squeeze
> performance it becomes more of a hindrance?

One of my favorite quotes by Heinrich Apfelmus, from

Well, it's highly unlikely that algorithms get faster by introducing
laziness. I mean, lazy evaluation means to evaluate only those things
that are really needed and any good algorithm will be formulated in a
way such that the unnecessary things have already been stripped off.
But laziness allows to simplify and compose algorithms. Sometimes,
seemingly different algorithms turn out to be two sides of the same
coin when formulated with lazy evaluation. Isn't it great that finding
the k-th minimum is not only an adaption of quicksort but can readily
be obtained from it by composing it with (!! k)?


> On Sat, Nov 28, 2009 at 1:47 AM, Bulat Ziganshin <bulat.ziganshin at gmail.com>
> wrote:
>> Hello Don,
>> Friday, November 27, 2009, 11:08:44 PM, you wrote:
>> >> it's just false assumption that you should got speed comparable to
>> >> other languages. haskell is lazy and ghc has much less mature compiler
>> > "comparable to other languages" eh?
>> > That seems a little too broad to be meaningful, Bulat, as we all know.
>> he compared to c++/java!
>> --
>> Best regards,
>>  Bulat                            mailto:Bulat.Ziganshin at gmail.com
> _______________________________________________
> Haskell-Cafe mailing list
> Haskell-Cafe at haskell.org
> http://www.haskell.org/mailman/listinfo/haskell-cafe

More information about the Haskell-Cafe mailing list