Real World Haskell Epublibre

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Real World Haskell

Having been an imperative developer for some years now, I had never had the urge to learn functional programming.

The rap on haskell in the real world is that haskell is easy for beginner programmers and very powerful for advanced programmers who know it well, but it is one of the more difficult languages for intermediate programmers facing real-world complexity. The NY Times video I mention above even acknowledges some or the obstacles. Choice for real-world Haskell, it tends to be used in an id-iosyncratic way—with small transactions and with heavy use of the retry mechanism, which allows a transaction to wait for a programmer-specified precondition. We believe that a more performant implementation of STM in Haskell would allow it to be used effectively in a. Real World Haskell takes you through the basics of functional programming at a brisk pace, and then helps you increase your understanding of Haskell in real-worl You'll learn how to use Haskell in a variety of practical ways, from short scripts to large and demanding applications. 本文档是 Real World Haskell一书的简体中文翻译版本，翻译工作正在进行中，欢迎加入。以下列出的是本文档各个章节目前的翻译进度，以及完成这些翻译的译者们，感谢所有译者为本文档所做的贡献！章节译者翻译进度第 1. Haskell without the theory — beginner-friendly, real-world Haskell tutorials. Download real-world-haskell or read real-world-haskell online books in PDF, EPUB and Mobi Format. Click Download or Read Online button to get real-world-haskell book now. This site is like a library, Use search box in the widget to get ebook that you want.

A couple months ago at last I decided to learn Haskell. It's quite a cool language, but I'm puzzled about how an event driven real app would be programmed in such a language. Do you know of a good tutorial about it?

Note: When I say 'real app' I'm not talking of a real world, production ready app. I just mean a little sample app, just to get the grasp of it. I think something like a simplified version of the windows caculator would be great, and then perhaps something a bit more complex.

ravenraven

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closed as primarily opinion-based by Robert Longson, joran, John Doyle, Ozzy, WrikkenJul 17 '13 at 23:46

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

7 Answers

When you say 'real world' examples you are presumably thinking about problems that are inherently sequential or stateful or do lots of I/O, right?

So, how about games?

Frag is a Quake clone, implemented for an undergraduate thesis (Functional Programming and 3D Games, Mun Hon Cheong, 2005). Here's a video of it in action.
Super Monao Bros. (formerly known as Super Nario Bros.) is, well, you can probably figure out which game it is a clone of. (This is the author's English language weblog.)
Purely Functional Retrogames is a 4-part series of blog articles about how to write games in a purely functional language, explained using Pacman as the example. (Part 2, Part 3, Part 4.)

Or, what about an X Window Manager, an extensible Emacs clone text editor or an IDE?

Then, there is the book, which even has your question already in the title: Real World Haskelland which is also available for free!

Another thing you might want to look at, is Functional Reactive Programming. (It is used in Frag, for example.) The interesting thing about FRP is that it allows you to look at the problem of, say, GUI programming from a very different angle. If you read the GUI chapter in the RWH book, you will see that it talks about how you can write a GUI application just like in C, only better. FRP OTOH allows you to write it in a totally different way that wouldn't even be possible in C.

A lot of times (I'm not saying that this is the case in your question, but it is a recurring pattern) when someone says 'but can Haskell be used in the real world', what they are really saying is 'I know how to do this in C, and in Haskell I cannot do it in exactly the same way, therefore it must be impossible in Haskell, therefore Haskell is not ready for the real world'. But what they are missing out on, is that there might be a totally different and much better way to solve the problem. (It's like saying 'Erlang doesn't have threads, therefore it cannot possibly be used to implement concurrent systems.') And FRP is just one example.

Jörg W MittagJörg W Mittag

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For a lightning talk today I have assembled this list of show-case Haskell applications, deliberately excluding anything that only targets programmers:

darcs (since 2002, 35 000 loc): Distributedversion control system with an innovative focus on changes insteadof states.
xmonad (since 2007, 30000 loc): Well knowntiling window manager with a huge library of layout and otherplugins. Made it into the list despite its configuration file beinga Haskell file.
hledger (since 2007, 9000 loc): Text-filebased double-ledger accounting tool, a clone ofledger.
Raincat (since 2008, 2000 loc):Platform game with a cat that does not want to get wet.
arbtt (since 2009, 2000 loc): Myautomatic rule-based time tracker. Made it into the list as ashameless plug; probably not that popular. It has now a proper webpage contributed by Waldir Pimenta.
detexify (since 2010, 500 loc): Theback end of the very useful LaTeX character command finder iswritten in Haskell.
git-annex (since 2010, 28 000loc): Manages your files and their location, a mixture of dropboxand git. Written by famous Joey Hess, who made a living from it viakickstarterHe is currently running a second round offunding!
Nikki and the Robots (since 2010, 18 000loc): Platform game with Nikki and, well, his robots. It wasproduced as a commercial independent game and sold via apay-what-you-like scheme, but the company unfortunately closed down.
hoodle (since 2011, 13 000 loc): Anote-taking and PDF annotation software likexournal.
Chordify (since 2012, ? loc): Analysesmusic, e.g. from a YouTube video, and calculates the correspondingguitar chords. Closed software, but supposedly written in Haskell.

(Also featured on my blog, and on the slides of the talk, with nice representative pictures of each program.)

Joachim Breitner Real World Haskell Epublibre

Joachim Breitner

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Real World Haskell Amazon

xmonad is event driven (literally). It has a listener loop that wakes up on events, modifying an internal state modelling the X server, which is then rendered to the screen.

Don StewartDon Stewart

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I once found this irc bot written in haskell:

Mercer TraiesteMercer Traieste

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Here are some links as you requested.

This one explains a lot of things that doesn't 'make sense' to an imperative programmer about Haskell

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This one is a very good easy to follow tutorial

Raytracer written in Haskell