- Wikibook - Haskell.org

WikiBook Haskell
by laura_huber＠ist-willig.de 13 Apr '14

13 Apr '14

Hi, does it make sense to post here my comments reg. the WikiBook? I am currently learning Haskell and find it quite nice and in a good way structured, but nevertheless some things are still with questionmarks, eg. how to read the signature properly? The samples I find great and I have some ideas as well for additional resp. variation, e.g. Why is cons of a function cons8 n= n:8 not possible, but n:[8] or with the tuple (head n, tail n) works, but if I want to have only (firstelement, lastelement) (Int, Int) How to... The PDF has also some minor issue, e.g. page 38 empty. But all gets me back to the initial question: Is this the proper place for adding remarks? laura

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Lista de emails enviar email lista email
by Ed Soares 23 Nov '13

23 Nov '13

Lista de emails enviar email lista email mala direta em casa também lista de emails, como fazer uma mala direta emails de pessoas: http://www.maladiretaemails.com pode ser que o que e mala direta, é maravilhoso para muitos indivíduos. como fazer mala direta programa para enviar e mail além lista de emails, endereco de email marketing email, é realmente o objetivo de nosso Site. se você quer lista email, como fazer uma mala direta e também lista de emails gratis: http://www.maladiretaemails.com é muito bom lista de email tais como email cadastro, como fazer mala direta mala direta. é benéfico lista com emails e, além disso marketing email. emails de pessoas email marketing gratis, trabalho com mala direta. atualmente cadastro email compreendendo Enviar email, enderecos de email é fantástico. o objetivo de nosso website: como fazer uma mala direta, Enviar email, e bem como email em massa. Disponibilizamos o melhor em cadastro email email em massa, emails de pessoas.

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Lista dos aprovados em vestibular Campestre
by Edson 29 May '13

29 May '13

Lista dos aprovados em vestibular Campestre: Ribeirãozinho: ANA ANGELICA PEREIRA ALVES, LETICIA BAIRLE, FRANCISCO ANDERSON VALE DO NASCIMENTO, PAULO DE SIQUEIRA SILVA, JOÃO CARLOS MOREIRA DE CARVALHO, DAMIANA PEREIRA DE OLIVERIA, MARIA DO SOCORRO DE ALBURQUERQUE ARRUDA BARBOSA, JAIME CUSTODIO DA SILVA FILHO. SEBASTIANA MÁRCIA GOMES DE MELO, ÉRICA FRANCISCA BATISTA DE MELO, MAYRES RAQUEL DA SILVA PINHEIRO, JUCIMARA VICENTE DOS SANTOS, WEULLER TEIXEIRA DE MAGALHAES. Lago dos Rodrigues. Campestre, ADISSON SOUZA TAVARES, JULIO CESAR DA SILVA MOURA FILHO, ERIDAN FERREIRA LEITE, MICHAEL LIMA SILVA, JOÃO CARLOS MOREIRA DE CARVALHO, CARLOS EDNAELTON DE MELO FERREIRA, MANOEL MARQUES DA CUNHA FILHO, IEDA BENTO BARROSO. ROBERTO FERREIRA LOPES FILHO, DOMINGOS SAVIO VIDAL DE LIMA FILHO, MARIANA ISABEL E SILVA, JOSE ALDER BRAGA JUNIOR, THAYS RAQUEL DA SILVA. Caiana. Nova Soure e ANA CAROLINA PINTO COSTA, LISLY KATELLY DE PAULA MARTINS, FRANCISCO HELSON DE LIMA NERES, PAULO RAFAEL PEREIRA SOARES, JOÃO CARLOS MOREIRA DE CARVALHO, DAMIÃO JOVENAL DOS SANTOS, MARIA GORETTI LIMA FREIRE, JANIMERY BARBOSA DE ABREU MELO. SHYSLAINE ARAÚJO BEZERRA, ARIANE SOARES SILVA, LUCAS MOREIRA DIAS, GILSON POLICARPO DE SÁ, REBECA DE FREITAS BARROS. Itumbiara.

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Guide for Portable Haskell on windows
by Devil may Cry 05 Jul '12

05 Jul '12

I have started learning Haskell for second time :) First was attempt was failure. I have simple guide how to create portable Haskell for Windows: 1. Download Haskell Platform from http://hackage.haskell.org/platform/ runas admin and select "just extract files" in Haskell dir 2. make Haskell\hs.bat -> ---------------------------- @ECHO OFF rem %~dp0 survives runas admin, %CD% doesn't rem %~d0 current drive rem No spaces in Path! SET Path=%Path%;%~dp0;%~dp0bin;%~dp0lib;%~dp0lib\extralibs\bin;%~dp0mingw\bin;%~dp0code;C:\Users\%USERNAME%\AppData\Roaming\cabal\bin CMD /k "cd %~dp0MyCode" ---------------------------- MyCode is folder in Haskell dir. Content between --- should be written in hs.bat 3. start hs.bat and type: path // check paths ghci // check interpreter Prelude> :? Test it for yourself and put it in a book if you think it will do some good.

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One less red link in Haskell Basics
by Daniel Mlot 09 Apr '12

09 Apr '12

Hello, Since I am doing some moderately large scale changes to the Beginner's Track so that we can eventually dispense with that "in reorganization" warning on the main page, I guess it is a good idea to write regularly to the list so that anyone with an opinion can chime in. Last week some nice progress (IMHO) was done with the first two parts of the Beginner's Trail; and by now I believe a newbie wouldn't find any serious breakage disrupting his progress through them. Beyond switching the main focus of "Next steps" to a first presentation of pattern matching, the other major change was an attempt at writing one of the two new pages that Apfelmus, back in 2010 envisioned for Haskell Basics; namely, "Building a vocabulary". My realization of "Building a vocabulary" has the same goal Apfelmus originally outlined - making newbies aware of the existence and importance of Prelude and the hierarchical libraries. Unfortunately, it does so in a chatty rather than practical way. To counter that, we will need at least some of the following: 1. the Prelude cheat sheets we talked about in 2010 (see http://en.wikibooks.org/wiki/Haskell/Experimental_Modules/Cheat_sheet_proto… for a rough demo - though by now I believe that the text sections after the table are unnecessary); 2. to make better use of the "Libraries Reference" part of Haskell in Practice (by completing some pages, making others clearer and providing more references to them in the Beginner's Track); 3. more exercises which involve actually using Prelude and the libraries. Some of these suggestions could be incorporated into "Building a vocabulary"; others would fit better being diluted along the Beginner's Trail. For the moment, though, I believe the initial version of the new page can give newbies some useful pointers. As usual, it will be most appreciated if you have a few minutes to spend reading "Building a vocabulary" and share your opinions on whether the advice given is sound, the text is not too boring and the example I made up is not too ridiculous. Regards, Daniel Mlot

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Splitting of "More on Datatypes"
by Daniel Mlot 03 Apr '12

03 Apr '12

Hi all, One of the ideas I had while reading the book but didn't have the guts to pull off without asking for feedback was splitting the More on Datatypes module in Intermediate Haskell. As of now, it has a first part which describes an assortment of important datatype techniques (enumerations, records and a more formal presentation of parametrized types - using Maybe as example) and then moves on to a long discussion of binary trees and how to define maps and folds for arbitrary data structures. The coupling of these two parts is very loose (the only concept of the first part needed for the data structure discussions is parametrization) and probably does not justify them being glued together to make such a long (27k) module. Another related issue is that one important omission from the Beginner's Track is an explanation of newtype, and I guess More on Datatypes would be the right place to put it. That would make the module even longer, however, and would be another reason to make the split. The only thing I am not sure of is a good name for the second "half" of More on Datatypes in case of a split. The obvious choice would be "Trees and ???" (I have no idea of a good concise term to replace the ???), although maybe something more generic like "Introduction to Data Structures" could work. Thanks, and see you, Daniel Mlot P.S.: By the way, Apfelmus has moved Type Declarations to just before Pattern Matching. Probably the right thing to do (it just didn't fit very well in Haskell Basics), but it will also require some reworking of Type Declarations (when I made that module more verbose I envisioned it as a preparation for a more general Pattern Matching discussion several modules ahead, but with the rearranging the redundancies are probably too obvious). I will give it a try soon.

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Truth values and a couple other things
by Daniel Mlot 12 Jun '10

12 Jun '10

While trying to think about how I could tackle the section on numerical types in "Type basics" I found out that I couldn't reason properly about it without knowing to which extent types would be discussed in the previous sections. That led me to "jump the gun" and attempt writing the bulk of the section myself. Apfelmus, please forgive me if that bothers you in any way (for instance, if you had a draft of your own being prepared) - in any case, just as I took some liberties with your outline feel free to do the same and turn my text upside down if you feel the need to :) I will use this message to register some issues that are roaming in my mind lest I forget to mention them: * Since we are reorganizing and rewriting most of the first chapters anyway it could be a good opportunity to standardize the style of code blocks. One option would be just using <source> tags everywhere to get syntax highlighting (with recent changes to the Wikibooks CSS files <source> is also bundled with the standard grey background box). There would be a couple possible issues to consider, though. We would probably have to do some template engineering, although I don't think that would be too troublesome. Another source of annoyance would be that GHCi printouts, ubiquitous on the early chapters, wouldn't be subject to the same standardization. Finally, there is the didactic concern of whether highlighting can be distracting for complete newbies during the first few modules (I do not have a really strong position on the subject but feel that "plain" plain text does have some charm due to sheer simplicity and transparency). * One thing that occurred to me while writing about guards: is it even accurate to speak of our if/else and related constructs as "control structures"? Even if it is correct, is there any better term to use - one that does not have such imperative undertones? Regards, Daniel Mlot

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"List of topics" meta-module
by Daniel Mlot 29 May '10

29 May '10

As a product of the discussions we (mainly me and Apfelmus) had over the last few threads I created a "List of topics" page in http://en.wikibooks.org/wiki/Haskell/List_of_topics . It is a simple presentation of the key topics covered by the book modules with occasional comments. The intention is to make picturing the structure of the book and brainstorming about large-scale reorganizations easier. As of now it covers only "Haskell Basics", "Elementary Haskell" and "Intermediate Haskell". If you find the list useful feel free to discuss book structure in its talk page, expand it to cover the advanced chapters or make test edits to visualize the effects of changes to the book organization. Regards, Daniel Mlot

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Anyone around?
by Daniel David 10 May '10

10 May '10

Hello everybody, I joined this list after spending a good while learning Haskell basics with the Wikibook and at the same time trying to do some refactoring on the book itself. Consider this a test message: I am looking for other people interested in discussing ways to improve the contents, and I'm polling the reactions/activity of the subscribers of this list. I am particularly interested in the Beginner Modules - not only because it's the area I, as a newbie haskeller, feel more comfortable in contributing to right now, but also because it naturally would tend to be kind of overlooked by veterans willing to add interesting stuff in the advanced chapters (as far as I can be aware of, only one Wikibook regular has seen some of my contributions there so far, namely Apfelmus). Waiting for your replies ;-) Daniel Mlot P.S.: Forgive me for any etiquette mistakes, it is the first time I'm using a conventional mailing list as opposed to a phpBB forum or something in that vein.

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Haskell syntax highlighting on Wikibooks/Wikipedia
by Eric Kow 25 Jun '09

25 Jun '09

Hi everybody, I just wanted to point out that with https://bugzilla.wikimedia.org/show_bug.cgi?id=10967 resolved, Haskell syntax highlighting is now available on Wikibooks You can see a small sample in http://en.wikibooks.org/wiki/User:Kowey/Haskell <source lang="haskell"> -- foo let x = foo </source> I think I'll post this to Haskell cafe as well -- Eric Kow <http://www.nltg.brighton.ac.uk/home/Eric.Kow> PGP Key ID: 08AC04F9

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