[Haskell-cafe] haskell.org

[amindfv at gmail.com]

As a replacement, what about:

[ n + 10 | n <- [1..9], odd n ]

Pithy and not equivalent to "id" :P

Tom


El Apr 20, 2015, a las 20:47, Tikhon Jelvis <tikhon at jelv.is> escribió:

> Are we constraining the examples to not use any external libraries? I can see why that's a good idea, but it also makes it hard to show something both pithy and useful.
> 
> On Mon, Apr 20, 2015 at 5:22 PM, <amindfv at gmail.com> wrote:
>> While we're at it, the "foldr (:) [] [1,2,3]" example probably isn't going to cause anyone to give away their worldly possessions and dedicate their lives to haskell.
>> 
>> Tom
>> 
>> 
>> El Apr 20, 2015, a las 18:53, Ertugrul Söylemez <ertesx at gmx.de> escribió:
>> 
>> > Hi everybody,
>> >
>> > I'd like to note that the prime "sieve" example that is sitting at the
>> > top of the homepage is not a real sieve and will more likely make people
>> > with number theory experience (like me) feel highly irritated rather
>> > than fascinated.  A real sieve does not only run a million times (!)
>> > faster and consumes far less memory, but is also much longer, even in
>> > Haskell.  Here is a real one:
>> >
>> >    <http://lpaste.net/101980>
>> >
>> > I don't want to make a mountain out of a molehill, but please note:  If
>> > I'd be new to Haskell, that example would have turned me off, because it
>> > would have hurt my ability to take Haskell programmers seriously.  You
>> > can easily promote your tools when you claim that they can build a car
>> > easily, except in reality it's just a toy bicycle.
>> >
>> > It's the same feeling to cryptographers when people call a regular
>> > stream cipher a "one-time pad" and promote it as such.  It rings the
>> > "this is snake oil!" alarm bell.
>> >
>> > So I propose to either rename the 'sieve' function to something more
>> > appropriate (like `trialDiv`) or replace the example altogether.  I
>> > would suggest an example that truly shows Haskell's strengths.  Trial
>> > division search is really just a bad substitute for the more common and
>> > equally inappropriate list quicksort example.
>> >
>> >
>> > Greets,
>> > Ertugrul
>> > _______________________________________________
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