On 18 Jun 2008, at 9:46 am, Jules Bean wrote:
This is exactly the sort of message that haskell-cafe does not
normally contain. Let's not start now.
Reactions/arguments like the ones on this thread are perfect for
Haskell - recursive and exponential.
:)
Could we have closure too? :-)
On 8 Oct 2009, at 00:41, Curt Sampson wrote:
On 2009-10-02 09:03 -0600 (Fri), John A. De Goes wrote:
[Haskell] is missing many key libraries that would be of great
commercial value.
Just out of curiousity, can you give me some examples of what you feel
these are?
Relational database
I'm looking for a library like Perl's Term-Readkey, so that I can
turn on and off the echo for secure password input from a terminal.
Anyone know which library I need to use for this?
Iain
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On 11 Oct 2009, at 13:58, John Lato wrote:
For anyone writing introductions to generic programming, take this as
a plea from Haskellers everywhere. If one of the RWH authors can't
understand how to make use of these techniques, what hope do the rest
of us have?
John Lato
P.S. Some might
On 11 Oct 2009, at 15:30, Andrew Coppin wrote:
Iain Barnett wrote:
I'm looking for a library like Perl's Term-Readkey, so that I can
turn on and off the echo for secure password input from a
terminal. Anyone know which library I need to use for this?
The package ansi-terminal allows you
On 24 Oct 2009, at 07:47, Curt Sampson wrote:
If you're doing something with any technological difficulty,
however, such as the next Twitter, Rails won't provide much of the
help
you really need.
Twitter was (originally, at least) done using ROR. What is it that
Haskell can do that Ruby
On 25 Oct 2009, at 03:42, Curt Sampson wrote:
There's the key difference between us, I suppose. You believe that
knowing the syntax and libraries of a language is the hardest part
of a
programming project. I believe it's a nearly trivial part.
I certainly didn't say that. Do you always
On 25 Oct 2009, at 08:31, Magnus Therning wrote:
Also, as I'm sure you've found out re libraries, more isn't
necessarily
better.
Definitely. Choice can become a real pain, especially in the face of
lacking documentation.
I'd argue that many, if not most, commonly used libraries
Curt,
I really do think you should lay off characterising other people's
comments. If you want clarification ask for it or ask a question. I
never said Haskell was failing, for example, but I would like an
example of it succeeding in the area that Ruby is being so heavily
criticised for.
[1 of 1] Compiling Main ( sha1.lhs, interpreted )
import qualified Data.ByteString as B
main = B.getLine = B.putStrLn
Ok, modules loaded: Main.
*Main :main
*** Exception: no buffering
And just to make sure it's not something to do with GHCi or anything
like that
main =
On 27 Oct 2009, at 15:47, Thomas DuBuisson wrote:
If you wanted to make sure it didn't have to do with ghci then you
should have compiled the original code, not tested different
functions.
That is a very good point!
On 27 Oct 2009, at 16:00, Daniel Fischer wrote:
Look at the sources:
On 25 Oct 2009, at 15:51, Curt Sampson wrote:
Funny, I do too. Still, when Luxuria opened for them in Vancouver
in the
'90s, I started to think about what Howard Devoto was doing
Anyone who recognises The Mark E. Smith is worthy of being master of
all he surveys.
But in others,
I was trying to go through some of the wxHaskell examples, and they
wouldn't work on my (Tiger) mac. Same thing happened with a few other
wx apps I downloaded from Hackage. A bit of a rummage on the internet
turned up an issue with wxMac[1]. You need to put the haskell
executable in an OSX
On 29 Oct 2009, at 15:41, Gregory Crosswhite wrote:
You don't have to turn a program into an application in order to
make the GUI work
This is true, but I don't think it's better to import extra code
where simple packaging (folders and a plist), which is actually very
convenient, can do
On 29 Oct 2009, at 20:52, Miguel Mitrofanov wrote:
Open up XCode and there are a lot of different types of projects
to choose from, and then you have to know how to use the IDE. This
is just a quick project set up for anything you want to do that is
straightforward.
So... Does it mean
Hi,
I'm trying to get to grips with HDBC and have the following problem. When I run
a query that returns a result set, each row comes back as a [SqlValue].
Naively, I thought the following function would convert a [SqlValue] into a
string, but instead I get the error below.
convrow2 ::
On 11 Feb 2010, at 10:05, Vasyl Pasternak wrote:
But fromSql function could convert everything to String, so you never
need to use `show`, just simply write
convrow2 :: [SqlValue] - String
convrow2 (x:xs) = foldl (\i j - i ++ | ++ (fromSql j)) (fromSql x) xs
But, IMO, this is more
On 7 Jun 2009, at 8:33 pm, ptrash wrote:
Hi,
is the are way (or a build in method) in haskell to get a random
number from
a number bottom to a number top?
Something like
let randomNumber = random 1 30
to get a random number between 1 and 30.
rand :: Int - Int - IO Int
rand low high =
On 10 Jun 2009, at 12:55 pm, ptrash wrote:
Now I have tried to write a Method which gives me a Number of
random numbers
the same way but it doesn't work.
randomList :: Int - [Integer]
randomList 0 = []
randomList n = do
r - randomRIO (1, 10)
Hi,
I'm trying to get my head around datatypes, and wondering how I might define
a simple Task datatype in Haskell.
data Task = Task { title :: String, completed :: Bool }
Ok, that's straightforward, but sometimes tasks become a list of tasks
themselves
data Task = Task { title :: String,
Ok, thanks to everyone, that's certainly answered my question and given me
some more avenues to pursue. I can see now that because I can pattern match
against the empty list it's not really a problem to have it there. I didn't
realise I could use Maybe in the constructor because it's a monad, but
Quick question: I've tested this in a couple of different terminals (roxterm
and xterm), so I'm fairly sure it's GHC that's the problem. Have I missed a
setting?
GHCi, version 6.10.4
Prelude putStrLn £
�
Hugs98 200609-3
Hugs putStrLn £
£
I get the same character output from a password generator
2009/8/19 David Leimbach leim...@gmail.com
Interesting... GHCI bug? Didn't the readline dependency go away not too
long ago? Could it be related?
I just tried this
Prelude putStrLn \£
ghc: panic! (the 'impossible' happened)
(GHC version 6.10.4 for i386-unknown-linux):
charType: '\163'
2009/8/19 Bulat Ziganshin bulat.zigans...@gmail.com
probably, terminals reports some unusual symbols. but any panic should
be reported to GHC Trac - anyway
I've added a new ticket here, in case you feel you want to add to it (or not
:)
http://hackage.haskell.org/trac/ghc/ticket/3443
Iain
2009/8/20 Ketil Malde ke...@malde.org
Stuart Cook sco...@gmail.com writes:
GHCi, version 6.8.2: http://www.haskell.org/ghc/ :? for help
Loading package base ... linking ... done.
Prelude map Data.Char.ord 饁
[39233]== 0x9941
Prelude putStrLn 饁
A ==
Got this back from the bug tracker
6.12.1 will have Unicode support in the IO library which mostly fixes this
problem. The rest is fixed by #3398.
Iain
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On 29 Sep 2009, at 03:19, Casey Hawthorne wrote:
If you do a student's homework, you are cheating that student out of
an education.
He/She may realize that t late in the future.
--
Regards,
Casey
I'm not sure I agree with that. If they're old enough to be doing
Haskell homework then
On 29 Sep 2009, at 12:48, Daniel Fischer wrote:
Am Dienstag 29 September 2009 13:04:38 schrieb Iain Barnett:
Personally, I tend to find exercises without access to the answers
a poor way to learn. You'll learn more from a well crafted example
than you ever will by struggling at something
On 7 Aug 2008, at 8:58 pm, Edward Ing wrote:
I am using the cabal system to build the hackage version of fastcgi.
I get the below messages with the runghc Setup.lhs build command.
Network\FastCGI.hsc:59:21: fcgiapp.h: No such file or directory
Network\FastCGI.hsc: In function `main':
, and that the task of
building on XP is quite different. Where are include headers and
libraries found in Windows XP system? What fastcgi implementation
would you need for a Windows XP? These are the probably the important
questions.
Edward Ing
On Thu, Aug 7, 2008 at 7:54 PM, Iain Barnett [EMAIL PROTECTED
Hi,
I have a function, that produces a random number between two given
numbers
rand :: Int - Int - IO Int
rand low high = getStdRandom (randomR (low,high))
(Naively) I'd like to write something like
take (rand 1 10 ) [1..10]
and see [1,2,3,4] ... or anything but nasty type-error
wrote:
Iain Barnett wrote:
Hi,
I have a function, that produces a random number between two
given numbers
rand :: Int - Int - IO Int
rand low high = getStdRandom (randomR (low,high))
(Naively) I'd like to write something like
take (rand 1 10 ) [1..10]
and see [1,2,3,4] ... or anything
of the other solutions
presented. Thanks for the links, I'll give them a read.
On Wed, Sep 24, 2008 at 5:10 PM, Lev Walkin [EMAIL PROTECTED] wrote:
forgot return, of course:
myTake :: IO [Int]
myTake = do
n - rand 1 10
return $ take n [1..10]
Lev Walkin wrote:
Iain Barnett wrote
of IO tutorials it just seems to be the 'do' syntax for
assigning a value to a symbol, but of course,
:t getLine
getLine :: IO String
On 24 Sep 2008, at 10:03 pm, Iain Barnett wrote:
Hi,
I have a function, that produces a random number between two given
numbers
rand :: Int - Int - IO Int
On 5 Oct 2008, at 7:06 pm, Henning Thielemann wrote:
Instead of separate calls to 'take' and 'drop' you may prefer
'splitAt':
requeue z xs =
let (prefix,pivot:suffix) = splitAt (z-1) xs
in prefix ++ suffix ++ [pivot]
Thanks. Took me a while to get the function to shuffle
If I were to create an object in C#, for instance, I could add code
to the constructor that might limit the type further e.g.
public class Car
{
string model;
int wheels;
public Car ( string model, int no_of_wheels )
{
if ( no_of_wheels = 2 )
PROTECTED] On Behalf Of Iain Barnett
Sent: 09 October 2008 2:03 pm
To: haskell-cafe@haskell.org
Subject: [Haskell-cafe] Constraints at construction
If I were to create an object in C#, for instance, I could
add code to the constructor that might limit the type further e.g.
public class Car
On 9 Oct 2008, at 9:33 pm, Andrew Coppin wrote:
I think it's just the teaching of the language that needs work,
not so much the language itself.
As a newer user myself, I'd agree with this statement. I'd like to
see far more mundane tasks solved in tutorials. The number of times
On 10 Oct 2008, at 7:05 pm, Jonathan Cast wrote:
On Fri, 2008-10-10 at 19:08 +0100, Iain Barnett wrote:
In Haskell it is.
Parsec makes recursive descent parsers as easy to use in Haskell as
regexps are in Perl. No reason not to expose newcomers to Haskell to
the thing it does best.
jcc
On 11 Oct 2008, at 6:34 pm, apfelmus wrote:
Andrew Coppin wrote:
Martin DeMello wrote:
http://blog.moertel.com/articles/2006/10/18/a-type-based-solution-
to-the-strings-problem
is a brilliant example of a common workaday problem found in other
languages, and solved elegantly in Haskell
On 11 Oct 2008, at 9:02 pm, Svein Ove Aas wrote:
On Sat, Oct 11, 2008 at 9:30 PM, Iain Barnett [EMAIL PROTECTED]
wrote:
Personally, I use stored procedures with a database as they
protect from sql
injection attacks (unless you write some really stupid procedures).
Isn't this what
On 12 Oct 2008, at 9:28 pm, Henning Thielemann wrote:
On Thu, 9 Oct 2008, Iain Barnett wrote:
If I were to create an object in C#, for instance, I could add
code to the constructor that might limit the type further e.g.
public class Car
{
string model;
int wheels
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