Welcome to issue 207 of the HWN, a newsletter covering developments in the Haskell community. This release covers the week of October 30 to November 05, 2011. You can find the HTML version of this issue at: http://contemplatecode.blogspot.com/2011/11/haskell-weekly-news-issue-207.ht... New and Updated Projects * hierarchical-clustering-diagrams (Felipe Almeida Lessa; 0.1) Library to draw diagrams of dendrograms. [1] http://goo.gl/7deyG * websockets (Jasper Van der Jeugt; 0.4.0.0) Major re-write to the library with support for multiple versions of the protocol. [2] http://goo.gl/i6bVr * cereal (Trevor Elliott; 0.3.4.0) Provides support for IEEE754 encoded Float/Double values. [3] http://goo.gl/GwZk8 Quotes of the Week * wyfrn: whats broken? my brain or ghci? * dons: Being really mean to your software, and following up when it breaks, makes it a lot better. But you have to be really, really mean. * hpc: and when you want to get really ridiculous, agda has universe polymorphism, which is when you don't know how high up the tower of turtles you have managed to climb Top Reddit Stories * Quick and dirty reinversion of control. Domain: blog.sigfpe.com, Score: 59, Comments: 7 On Reddit: [4] http://goo.gl/J2oon Original: [5] http://goo.gl/pQYGA * Running a Startup on Haskell [Presentation] Domain: infoq.com, Score: 57, Comments: 12 On Reddit: [6] http://goo.gl/uqfqN Original: [7] http://goo.gl/QMu5c * LLVM patch is merged for inclusion in LLVM 3.0 release | GHC on ARM Domain: ghcarm.wordpress.com, Score: 48, Comments: 2 On Reddit: [8] http://goo.gl/UNRN6 Original: [9] http://goo.gl/h6q7I * Thunks and lazy blackholes: an introduction to GHC at runtime Domain: mainisusuallyafunction.blogspot.com, Score: 39, Comments: 0 On Reddit: [10] http://goo.gl/nQN3U Original: [11] http://goo.gl/HqKaL * GHC feature request: warn about unused constraints -- "I think this could make for a nice project for someone wanting to dig into hacking on GHC" Domain: byorgey.wordpress.com, Score: 34, Comments: 16 On Reddit: [12] http://goo.gl/MIMCN Original: [13] http://goo.gl/GPt0B * Haskell Implementors Workshop 2011 Videos Online! Domain: neilmitchell.blogspot.com, Score: 31, Comments: 3 On Reddit: [14] http://goo.gl/MqszQ Original: [15] http://goo.gl/LUsFe * What Constraints Entail, Part 1 Domain: comonad.com, Score: 29, Comments: 0 On Reddit: [16] http://goo.gl/Tt41V Original: [17] http://goo.gl/SdGdm * [Newbie]: Haskell code is really slow compared to same code in Python. Can anyone help me find what the problem is ? Domain: self.haskell, Score: 29, Comments: 51 On Reddit: [18] http://goo.gl/15bb8 Original: [19] http://goo.gl/15bb8 * Please help me gather information about Haskell installations on Macs Domain: gist.github.com, Score: 26, Comments: 14 On Reddit: [20] http://goo.gl/Yfc32 Original: [21] http://goo.gl/xQACw * Why learning Functional Programming (and Haskell in particular) can be hard Domain: harishankar.org, Score: 25, Comments: 46 On Reddit: [22] http://goo.gl/8Xb3V Original: [23] http://goo.gl/FKlcj * How do you write nontrivial tests in QuickCheck? Domain: self.haskell, Score: 23, Comments: 15 On Reddit: [24] http://goo.gl/FL6jh Original: [25] http://goo.gl/FL6jh Top StackOverflow Questions * Calling Haskell from Java with C in between votes: 14, answers: 1 Read on SO: [26] http://goo.gl/RyN00 * Is “List” specially handled in Haskell's pattern matching? votes: 14, answers: 5 Read on SO: [27] http://goo.gl/y3hdi * Why does this simple use of the State monad cause a stack overflow? votes: 12, answers: 1 Read on SO: [28] http://goo.gl/bLlnX * Why does this Haskell code not terminate? votes: 10, answers: 4 Read on SO: [29] http://goo.gl/LStfr * Is it possible to make a type an instance of a class if its type parameters are in the wrong order? votes: 10, answers: 4 Read on SO: [30] http://goo.gl/aRh0b * How to make a type with restrictions votes: 9, answers: 3 Read on SO: [31] http://goo.gl/SRTfY * Desugaring do-notation for Monads votes: 9, answers: 1 Read on SO: [32] http://goo.gl/CqoQF * Equation from “Programming Pearls” - can somebody explain me? votes: 8, answers: 1 Read on SO: [33] http://goo.gl/kUr67 * ADT names. What is `Left a`, and then what is `a`, in Haskell? votes: 8, answers: 2 Read on SO: [34] http://goo.gl/IVoN0 * Why are boxed vectors so slow? votes: 8, answers: 1 Read on SO: [35] http://goo.gl/4RrQX Until next time, Daniel Santa Cruz References 1. http://permalink.gmane.org/gmane.comp.lang.haskell.bio/156 2. http://permalink.gmane.org/gmane.comp.lang.haskell.web/2204 3. http://permalink.gmane.org/gmane.comp.lang.haskell.cafe/93644 4. http://blog.sigfpe.com/2011/10/quick-and-dirty-reinversion-of-control.html 5. http://www.reddit.com/r/haskell/comments/luyf4/quick_and_dirty_reinversion_o... 6. http://www.infoq.com/presentations/Running-a-Startup-on-Haskell 7. http://www.reddit.com/r/haskell/comments/lv9ge/running_a_startup_on_haskell_... 8. https://ghcarm.wordpress.com/2011/11/03/llvm-patch-is-merged-for-inclusion-i... 9. http://www.reddit.com/r/haskell/comments/lzaa7/llvm_patch_is_merged_for_incl... 10. http://mainisusuallyafunction.blogspot.com/2011/10/thunks-and-lazy-blackhole... 11. http://www.reddit.com/r/haskell/comments/luxzj/thunks_and_lazy_blackholes_an... 12. https://byorgey.wordpress.com/2011/11/05/wanted-ghc-feature-warn-about-unuse... 13. http://www.reddit.com/r/haskell/comments/m23h2/ghc_feature_request_warn_abou... 14. http://neilmitchell.blogspot.com/2011/11/haskell-implementors-workshop-2011.... 15. http://www.reddit.com/r/haskell/comments/lwpzf/haskell_implementors_workshop... 16. http://comonad.com/reader/2011/what-constraints-entail-part-1/ 17. http://www.reddit.com/r/haskell/comments/lyqnx/what_constraints_entail_part_... 18. http://www.reddit.com/r/haskell/comments/m03p9/newbie_haskell_code_is_really... 19. http://www.reddit.com/r/haskell/comments/m03p9/newbie_haskell_code_is_really... 20. https://gist.github.com/f8f0464fb76e9fa2cfa1 21. http://www.reddit.com/r/haskell/comments/lz26e/please_help_me_gather_informa... 22. http://harishankar.org/blog/entry.php/why-learning-functional-programming-an... 23. http://www.reddit.com/r/haskell/comments/lv84d/why_learning_functional_progr... 24. http://www.reddit.com/r/haskell/comments/lvupa/how_do_you_write_nontrivial_t... 25. http://www.reddit.com/r/haskell/comments/lvupa/how_do_you_write_nontrivial_t... 26. http://stackoverflow.com/questions/7961335/calling-haskell-from-java-with-c-... 27. http://stackoverflow.com/questions/7992524/is-list-specially-handled-in-hask... 28. http://stackoverflow.com/questions/7998458/why-does-this-simple-use-of-the-s... 29. http://stackoverflow.com/questions/7960543/why-does-this-haskell-code-not-te... 30. http://stackoverflow.com/questions/8005372/is-it-possible-to-make-a-type-an-... 31. http://stackoverflow.com/questions/7978191/how-to-make-a-type-with-restricti... 32. http://stackoverflow.com/questions/8019670/desugaring-do-notation-for-monads 33. http://stackoverflow.com/questions/7967337/equation-from-programming-pearls-... 34. http://stackoverflow.com/questions/7969499/adt-names-what-is-left-a-and-then... 35. http://stackoverflow.com/questions/7978130/why-are-boxed-vectors-so-slow