Welcome to issue 218 of the HWN, an issue covering crowd-sourced bits
of information about Haskell from around the web. This issue cover the
weeks of February 26 to March 10, 2012.
You can find the HTML version at:
http://contemplatecode.blogspot.com/2012/03/haskell-weekly-news-issue-218.html
Quo
Just a little more interesting information: This is why impure languages
like OCaml have the value restriction. Haskell doesn't need it because it
is pure, but of course unsafePerformIO thwarts that.
On Mar 15, 2012 1:34 PM, "Tillmann Rendel"
wrote:
> Hi,
>
> this is one of the reasons why unsafe
El 15/03/12 19:53, Anthony Cowley escribió:
On Thursday, March 15, 2012 at 2:27 PM, Juan Miguel Vilar wrote:
Hello, café:
I am trying to use more than one array with runSTUArray but I don't seem
to be able to understand how it works. My first try is this:
test1 n = runSTUArray $ do
a <- newArr
El 15/03/12 20:07, Daniel Fischer escribió:
On Thursday 15 March 2012, 19:53:56, Daniel Fischer wrote:
On Thursday 15 March 2012, 19:27:18, Juan Miguel Vilar wrote:
Hello, café:
However, when I write
test2 n = runSTUArray $ do
let createArray v n = newArray (1, n) (v::Int)
On Thursday 15 March 2012, 19:53:56, Daniel Fischer wrote:
> On Thursday 15 March 2012, 19:27:18, Juan Miguel Vilar wrote:
> > Hello, café:
>
> > However, when I write
> >
> > test2 n = runSTUArray $ do
> >
> > let createArray v n = newArray (1, n) (v::Int)
>
> Here you create a
On Thursday, March 15, 2012 at 2:27 PM, Juan Miguel Vilar wrote:
> Hello, café:
>
> I am trying to use more than one array with runSTUArray but I don't seem
> to be able to understand how it works. My first try is this:
>
> test1 n = runSTUArray $ do
> a <- newArray (1, n) (2::Int)
> b <- newAr
On Thursday 15 March 2012, 19:27:18, Juan Miguel Vilar wrote:
> Hello, café:
>
> I am trying to use more than one array with runSTUArray but I don't seem
> to be able to understand how it works. My first try is this:
>
> test1 n = runSTUArray $ do
> a <- newArray (1, n) (2::Int)
>
Hello, café:
I am trying to use more than one array with runSTUArray but I don't seem
to be able to understand how it works. My first try is this:
test1 n = runSTUArray $ do
a <- newArray (1, n) (2::Int)
b <- newArray (1, n) (3::Int)
forM_ [1..n] $ \i -> do
Hi,
this is one of the reasons why unsafePerformIO is not type-safe. Lets
see what's going on by figuring out the types of the various definitions.
cell = unsafePerformIO $ newIORef []
newIORef returns a cell which can hold values of the same type as its
arguments. The type of the empty l
Maybe everytime you use 'cell' you tell haskell to create NEW cell.
Try this:
push' i cell = modifyIORef cell (++ [i])
main = do
cell <- newIORef []
push' "x" cell {- push' 3 cell will be incorrect in this case -}
push' "o" cell
readIORef cell >>= return
Why the original code pordu
Why does the following program compile and produce the results it does?
It seems like 3 and "x" got interpreted as the same type, (). Thanks in
advance for your help.
import Data.IORef
import System.IO.Unsafe
cell = unsafePerformIO $ newIORef []
push i = modifyIORef cell (++ [i])
main = do
pu
ArrowNavigatableTree can also get a following sibling Axis:
http://hackage.haskell.org/packages/archive/hxt/9.2.2/doc/html/Control-Arrow-ArrowNavigatableTree.html
Wilfried
2012/3/15 Никитин Лев :
> Oh, yes!
> In this situation with so poor structured source I can try to use tagsoup.
> (or I'll
Oh, yes!
In this situation with so poor structured source I can try to use tagsoup. (or
I'll take a look at xml-conduit).
Nevertheless for better undestanding HXT it will be interesting to solve this
problem in HXT. Or is it impossible?
15.03.2012, 20:08, "Asten, W.G.G. van (Wilfried, Studen
I absolutly agree with you but unfortunetly, it is not my xml file.It is extraction from html page of public web server. I cannot to change format of this html page.Sorry. I had to explain it in first letter. But than what about to get sibling text (geting sibling is an separate interesting tasks
On Thu, Mar 15, 2012 at 6:53 AM, Christopher Done
wrote:
> On 15 March 2012 06:53, Clint Moore wrote:
> > We're closing in on a month since this post. Did everyone decide to
> > do their own thing, do nothing, or ?
>
> Ah, I'd been traveling after posting this and then settling back in
> work, t
I'm am not really familiar with XML parsing in Haskell, but I am
wondering why, if you have an xml file, you not simply name the
element after the type of contents:
Some Story
This story about..
Tom Smith
Alternatively you could use the class or some type attribute to
indicate
On 15 March 2012 06:53, Clint Moore wrote:
> We're closing in on a month since this post. Did everyone decide to
> do their own thing, do nothing, or ?
Ah, I'd been traveling after posting this and then settling back in
work, this remains on my TODO list in my organizer. I have no plans
laid out
Hello, haskellers.
Suppose we have this xml doc (maybe, little stupid):
Some story
Description: This story about...
Author: Tom Smith
In the end I whant to get list: [("Title", "Some story"), ("Description","This
story about..."), ("Author", "Tom Smith")],
or, maybe this: Book "Some st
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