News aggregator - Thu, 10/09/2014 - 12:01pm
Categories: Offsite Blogs - Thu, 10/09/2014 - 12:01pm
Categories: Offsite Blogs

Haskell Weekly News: Issue 309

General haskell list - Thu, 10/09/2014 - 5:07am
Welcome to issue 309 of the HWN, an issue covering crowd-sourced bits of information about Haskell from around the web. This issue covers from September 28 to October 4, 2014 Quotes of the Week * Uh... I'ma have to read the IRC logs... No good quotes < at >remember'd Top Reddit Stories * Announcing needle: ASCII-fied arrow notation Domain:, Score: 103, Comments: 119 Original: [1] On Reddit: [2] * How we might abolish Cabal Hell, part 1 Domain:, Score: 95, Comments: 69 Original: [3] On Reddit: [4] * After some failed attempts to learn Parsec I came across this incredibly patient tutorial and now I'm writing parsers! Domain:, Score: 79, Comments: 17 Original: [5] On Reddit: [6] * Neil Mitchell's Haskell Blog: Why Traversable/Foldable should not be in the Prelu
Categories: Incoming News

Looking for a Google Hangouts tutor/advisor onHaskell

haskell-cafe - Thu, 10/09/2014 - 4:01am
I am looking for a Haskell developer who can review my code, suggest improvements, and generally help me become a better Haskell programmer more quickly. As such, you should be very proficient with Haskell yourself. Maybe you do Haskell work professionally; maybe you have contributed to a couple open-source projects, maybe you're a well-known Haskell blogger, writer or teacher. I am a beginner, although I have been programming professionally for many years. I do have a basic foundation in functional programming languages, including Haskell, but most of my background is with dynamic languages like Ruby and Python. I'm thinking we would meet once a week on a Google Hangout (or other technology) for an hour or so and I'd show you my code and have you review it. (Take it away and mark it up if you want.) I'd ask questions and we can discuss them. You can tell me about anything you think I might need to know to be more effective. I might also email questions to you or ask for more time than described abo
Categories: Offsite Discussion

Jop opening: web developers (with a taste forHaskell!) at Anchor

haskell-cafe - Thu, 10/09/2014 - 2:26am
Web Developers and Web Designers ================================ The engineering department at Anchor is building the analytics capabilities, internal systems, cloud infrastructure, deployment tooling, and operations practices that will be needed to take the company to the next level. These things all need front-ends. It goes without saying that the web is the platform for bringing new products to market, but we're a hosting company; most of our staff are operations-focused and our customers are too. What they really want are better tools to manipulate infrastructure. And even though Real Sysadmins™ prefer command-line tools (we build those too) there's still the need to cleanly present and visualize information, and the web is the place to do that. Haskell is the working language for internal development; the benefits of type safety, resilience when refactoring, and stability over time added to the power of functional programming has already paid dividends. An open question is how far we can push s
Categories: Offsite Discussion

type families with non-type indices

haskell-cafe - Wed, 10/08/2014 - 1:28pm
Is there an analog or variant of type families that is indexed by values rather than by types? An example of such a family is integers mod p. One wants to define the operations once for all p, so that a type for any particular p can be introduced by a one-line declaration. Of course this can be done with p being a run-time parameter: data Modp = Modp Integer Int instance Num (Modp) where (Modp x p) + (Modp y q) = if p==q then Modp ((x+y) 'mod' p) p else error "unequal moduli in Modp operation" But it would be better to catch the error at compile time and not have to check at every operation. Doug
Categories: Offsite Discussion

Proposal: Make a very slight change to the semantics of Data.List.isSuffixOf

libraries list - Wed, 10/08/2014 - 9:15am
Currently, isSuffixOf is defined like this: xs `isSuffixOf` ys = reverse xs `isPrefixOf` reverse ys If ys is much longer than xs, this is not so wonderful, because we have to reverse the whole spine of ys. It also will fail whenever either xs *or* ys is infinite. The following implementation seems a lot saner (although longer): isSuffixOf :: forall a . (Eq a) => [a] -> [a] -> Bool [] `isSuffixOf` _ = True needle `isSuffixOf` hay = maybe False (\fp -> needle `eq` getEndChunk hay fp) (getFrontPointer needle hay) where eq :: [a] -> [a] -> [a] (x:xs) `eq` (y:ys) = x==y && (xs `eq` ys) getEndChunk :: [a] -> [a] -> [a] getEndChunk (_:hy) (_:fp) = getEndChunk hy fp getEndChunk hy _ = hy getFrontPointer :: [a] -> [a] -> Maybe [a] getFrontPointer [] hy = Just hy getFrontPointer _ [] = Nothing getFrontPointer (_:nd) (_:hy) = getFrontPointer nd hy This doesn't do any of that crazy stuff, and it will w
Categories: Offsite Discussion

PLT Redex: The Summer School, Call for Participation

General haskell list - Tue, 10/07/2014 - 2:04pm
PLT REDEX: THE SUMMER SCHOOL CALL for PARTICIPATION Matthias Felleisen, Robert Bruce Findler, Matthew Flatt LOCATION: University of Utah, Salt Lake City DATES: July 27 - July 31, 2015 PLT Redex is a lightweight, embedded DSL for modeling programming languages, their reduction semantics, and their type systems. It comes with an IDE and a toolbox for exploring, testing, debugging, and type-setting language models. The PLT research group has successfully used Redex to model and analyze a wide spectrum of published models. The summer school will introduce students to the underlying theory of reduction semantics, programming in the Redex language, and using its tool suite effectively. The course is intended for PhD students and researchers in programming languages. Enrollment is limited to 25 attendees. While the workshop itself is free, attendees must pay for travel, room, and board. We expect room and board to be around $500, assuming an arrival in the evening of
Categories: Incoming News

New gtk2hs 0.12.4 release

gtk2hs - Wed, 11/21/2012 - 12:56pm

Thanks to John Lato and Duncan Coutts for the latest bugfix release! The latest packages should be buildable on GHC 7.6, and the cairo package should behave a bit nicer in ghci on Windows. Thanks to all!


Categories: Incoming News