Type classes are the approach to constrain type variables, to bound
polymorphism and limit the set of types the variables can be
instantiated with. If we have two type variables to constrain,
multi-parameter type classes are the natural answer then. Let's take
this solution and see where it leads
Hi,
I'd like to start using web pages as the UI for apps. I found out for yesod,
snapp and happstack as the candidates.
Would you recommend any of them as better for app ui (not classical web
pages)? Or maybe another one?
thanks,
vlatko
___
Doing HTML UI with Happstack was a pleasant experience.
Отправлено с iPhone
21.05.2013, в 12:47, Vlatko Basic vlatko.ba...@gmail.com написал(а):
Hi,
I'd like to start using web pages as the UI for apps. I found out for yesod,
snapp and happstack as the candidates.
Would you recommend any
If you like to create a stand alone application I know that happstack was
created for stand-alone applications with no database, although Yesod and
Snap can do it as well. If your application is a-single-page-doit-all by
using a lot of JavaScript (or Fay) , then any of these restful frameworks
We are offering a MOOC on haskell :
https://moocfellowship.org/submissions/the-dance-of-functional-programming-languaging-with-haskell-and-python
Full Announcement on beginners list :
http://www.haskell.org/pipermail/beginners/2013-May/012013.html
One question that I have been grappling with in
Maybe you could look at Helium [
http://www.cs.uu.nl/wiki/bin/view/Helium/WebHome].
From what I understand, it's a subset of Haskell specially designed for
teaching. I heard that it provides also very good error messages and hints
about typical errors.
2013/5/21 Rustom Mody rustompm...@gmail.com
Rustom,
you should look at Helium
- http://www.cs.uu.nl/wiki/bin/view/Helium/WebHome
Andrew.
On 21 May 2013, at 10:55, Rustom Mody wrote:
We are offering a MOOC on haskell :
https://moocfellowship.org/submissions/the-dance-of-functional-programming-languaging-with-haskell-and-python
I was wondering about this too. I have a database-heavy,
performance-sensitive app in mind. It will serve approximately the same
logic over both a raw UDP socket and an HTML5 app generating its pages on
the fly. I know that sounds odd but some users still have ordinary phones
on cheap data
On Tue, May 21, 2013 at 06:18:16PM +0800, Adrian May wrote:
* can I use postgres from Haskell?
I've been successfully using
http://hackage.haskell.org/package/postgresql-simple
It's fine so far except it throws exceptions willy-nilly. (I find
exceptions very un-Haskell but some people
On 21 May 2013 18:24, Tom Ellis tom-lists-haskell-cafe-2...@jaguarpaw.co.uk
wrote:
I've been successfully using
http://hackage.haskell.org/package/postgresql-simple
It's fine so far except it throws exceptions willy-nilly. (I find
exceptions very un-Haskell but some people seem to
Hi Adrian,
What's an exception? I thought Haskell used Maybe.
Haskell also has exceptions:
dan@machine ~ ghci
Prelude head []
*** Exception: Prelude.head: empty list
I also consider them as quite problematic, especially if they're used in
libraries, but sometimes we're all a bit lazy and
Hello,
I'm attempting to write a parser for files that look like this:
Bruker Nano GmbH Berlin, Germany
Esprit 1.9
Date: 02/05/2013 10:06:49 AM
Real time: 15000
Energy Counts
-0.4740
.
The line before the ellipsis is repeated many times (such lines
represents a spectrum). I need to
* Roger Mason rma...@mun.ca [2013-05-21 12:22:53-0230]
Thus far, I have:
-- derived from RWH
-- file: ch16/csv2.hs
import Text.ParserCombinators.Parsec
headerLines = endBy csvFile endHeader
csvFile = endBy line eol
line = sepBy cell (char ',')
cell = many (noneOf ,\n)
eol = char '\n'
Hi Roman,
On 05/21/2013 12:36 PM, Roman Cheplyaka wrote:
Clearly, my naiive implementation of endHeader is no good.
Hi Roger,
Not in scope means that that thing is not defined.
So it's not a problem with your implementation, but with the way you
load it.
If you copy-paste your ghci session
* Roger Mason rma...@mun.ca [2013-05-21 13:33:47-0230]
Hi Roman,
On 05/21/2013 12:36 PM, Roman Cheplyaka wrote:
Clearly, my naiive implementation of endHeader is no good.
Hi Roger,
Not in scope means that that thing is not defined.
So it's not a problem with your implementation, but
Hi. I'd like to announce the vsim - the simulator for (small subset
of) VHDL language. Currently
the project contains pretty large Java part and is not maintained.
That's why I don't want to
publish it on Hackage. Still, as far as I now have a permission to
share the code, I would like to do it.
Thank you.
Roger
On 05/21/2013 03:15 PM, Roman Cheplyaka wrote:
So this is the real error. If you read it carefully, it says that it
expected [[String]] but got Char (i.e. [[[String]]]) as a
result of the headerLines parser. I don't have time right now to look
closer at your code,
Helium seems interesting, but the code is a little stale, no? The last
updates seem to be from 2008-2009. I couldn't get it to build with ghc
7.6.3, not that I tried too terribly hard.
On Tue, May 21, 2013 at 6:07 AM, Andrew Butterfield
andrew.butterfi...@scss.tcd.ie wrote:
Rustom,
you
I looked at MFlow a little and it looks promising.
I'll give it a try.
Thanks Alberto.
Original Message
Subject: Re: [Haskell-cafe] HTML framework for web-ui
From: Alberto G. Corona agocor...@gmail.com
To:
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