I'm a somewhat experienced coder but I am relatively new to Haskell.
I've got a question about whether a usage of do notation is idiomatic,
or whether it's better to use pattern matching.
I've got two functions which take an input and return Maybe SomeType.
If either returns Nothing, I also want
Hello Haskell Group,
I work in mainstream software industry.
I am going to make an assumption except for Jane Street
Capital all/most Wall Street software is written in an imperative
language.
Assuming this why is Wall Street not awaken to the dangers. As I
write, Knight
The do notation in this instance yields a nice advantage: if you want to
switch to a different monad to encapsulate failure you will meely need to
swap out the type signature and your function will need no further work.
On Aug 4, 2012 7:35 AM, Matthew wonderzom...@gmail.com wrote:
I'm a somewhat
Of course! I will have a play this weekend. Thanks for the advice.
On Aug 3, 2012 10:45 PM, Nathan Howell nathan.d.how...@gmail.com wrote:
On Fri, Aug 3, 2012 at 2:35 PM, Benjamin Edwards edwards.b...@gmail.com
wrote:
I am struggling to get ctags and / or haskell mode to work with
cabal-dev.
Also if you don't need foo and bar you can write:
callFoo callBar return baz
//Johan
On Aug 4, 2012 8:36 AM, Matthew wonderzom...@gmail.com wrote:
I'm a somewhat experienced coder but I am relatively new to Haskell.
I've got a question about whether a usage of do notation is idiomatic,
or
Vasili I. Galchin vigalc...@gmail.com writes:
I am going to make an assumption except for Jane Street
Capital all/most Wall Street software is written in an imperative
language.
Tsuru Captial and Standard Chartered are also known to hire functional
programmers.
Assuming this
On Fri, Aug 3, 2012 at 11:34 PM, Matthew wonderzom...@gmail.com wrote:
I'm a somewhat experienced coder but I am relatively new to Haskell.
I've got a question about whether a usage of do notation is idiomatic,
or whether it's better to use pattern matching.
I've got two functions which take
I'm writing a toy program (for a SPOJ problem--see
https://www.spoj.pl/problems/ABCDEF/ ) and the profiler says my
performance problem is that I'm spending too much time sorting. I'm
using Data.List.sort on [Int32] (it's a 32-bit architecture). Others,
using other languages, have managed to solve
On Sat, 4 Aug 2012, Vasili I. Galchin vigalc...@gmail.com wrote:
Hello Haskell Group,
I work in mainstream software industry.
I am going to make an assumption except for Jane Street
Capital all/most Wall Street software is written in an imperative
language.
Assuming this why
I feel like this thread is kind of surreal. Knight Capital's mistake
was to use imperative programming styles? An entire industry is
suffering because they haven't universally applied category theory to
software engineering and live systems? Am I just a victim of a small
troll/joke?
- Jake
On
On Fri, Aug 3, 2012 at 10:34 PM, damodar kulkarni
kdamodar2...@gmail.com wrote:
So, another doubt, if detecting spam is trivial, then why not just send the
detected spam to trash directly without any human inspection?
This may mean some trouble for the posters due to false positives; but the
On Sat, 4 Aug 2012, Jake McArthur jake.mcart...@gmail.com wrote:
I feel like this thread is kind of surreal. Knight Capital's mistake
was to use imperative programming styles? An entire industry is
suffering because they haven't universally applied category theory to
software engineering and
It's generally not advisable to use Data.List for performance-sensitive
parts of an application.
Try using Data.Vector instead: http://hackage.haskell.org/package/vector
On Sat, Aug 4, 2012 at 11:23 AM, David Feuer david.fe...@gmail.com wrote:
I'm writing a toy program (for a SPOJ problem--see
Yes.
On Sat, Aug 4, 2012 at 1:47 PM, Jay Sulzberger j...@panix.com wrote:
On Sat, 4 Aug 2012, Jake McArthur jake.mcart...@gmail.com wrote:
I feel like this thread is kind of surreal. Knight Capital's mistake
was to use imperative programming styles? An entire industry is
suffering
On Sat, 4 Aug 2012, Clark Gaebel cgae...@uwaterloo.ca wrote:
Yes.
Thank you!
Further, if you want:
Let us have two types s and t. Let _|_^s be the_|_ for type s,
and let _|_^t be the _|_ for type t.
For which famous equivalences of the Haskell System are these two
_|_ objects
As far as I know, you can't check equivalence of _|_. Since Haskell uses
_|_ to represent a nonterminating computation, this would be
synonymouswith solving the halting
problem.
On Sat, Aug 4, 2012 at 2:04 PM, Jay Sulzberger j...@panix.com wrote:
On Sat, 4 Aug 2012, Clark Gaebel
On Sat, 4 Aug 2012, Clark Gaebel cgae...@uwaterloo.ca wrote:
As far as I know, you can't check equivalence of _|_. Since Haskell uses
_|_ to represent a nonterminating computation, this would be
synonymouswith solving the halting
problem.
Ah, thanks. I will attempt to think about this.
Hello. What are the best practices in deprecating packages on Hackage?
I've seen packages marked DEPRECATED in the synopsis field on Hackage,
and one could add GHC deprecated pragmas for every module, but is that
the best one can do?
Thank you in advance,
Andrey Chudnov
On Sat, Aug 4, 2012 at 3:30 PM, Andrey Chudnov achud...@gmail.com wrote:
Hello. What are the best practices in deprecating packages on Hackage? I've
seen packages marked DEPRECATED in the synopsis field on Hackage, and one
could add GHC deprecated pragmas for every module, but is that the best
I realized my algorithm is insane. The correct way to sort [a*b|a-A, b-B]
is clearly to sort A and B, then for each a in A construct either map (a*)
B or map (a*) (reverse B), depending on the sign of a, then merge all these
results together with a merge that collapses duplicates. I was
Actually Haskell is used in a surprising number of trading groups. However
most people involved are contractually obligated to never talk about the
technology in use at their firm. We make no secret that we use Haskell as
our primary language in building trading systems. Other functional
* Vasili I. Galchin:
I am going to make an assumption except for Jane Street
Capital all/most Wall Street software is written in an imperative
language.
I expect that most of it is written in Excel, which doesn't really
qualify as an imperative language. High-frequency trading is
Hello Haskellers!
I'm going to give a talk on Haskell at Ubucon 2012 in Berlin (In
German). I want to give an introduction about the concept of functional
programming and the special language concepts of Haskell.
Any ideas what to focus on?
Yours, Robert Clausecker
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On Sat, Aug 4, 2012 at 7:05 AM, Alexander Solla alex.so...@gmail.com wrote:
On Fri, Aug 3, 2012 at 11:34 PM, Matthew wonderzom...@gmail.com wrote:
I'm a somewhat experienced coder but I am relatively new to Haskell.
I've got a question about whether a usage of do notation is idiomatic,
or
I've got a function which takes in two chars, describing a playing
card and a suit. An example would be 4C or TH for a 4 of Clubs or a
Ten of Hearts. I need to be able to compare the ranks of a card (e.g.
a King is 13), so a Card is a tuple of rank and suit. The function
which parses a Card is
On Sat, Aug 4, 2012 at 7:05 AM, Alexander Solla alex.so...@gmail.com wrote:
On Fri, Aug 3, 2012 at 11:34 PM, Matthew wonderzom...@gmail.com wrote:
...
With do notation, I can write something like this:
do
foo - callFoo x
bar - callBar x
return (baz)
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