Welcome to issue 199 of the HWN, a newsletter covering developments in the Haskell community. This release covers the week of September 4 to 10, 2011. Announcements Johannes Waldmann open the invitation to the 6th Haskell in Leipzig workshop, on October 7, 2011. It "will present an absolutely thrilling mixture of tutorials and talks, with special enphasis on parallel programming." [1] http://goo.gl/u0PwF New and Updated Projects * Hs2lib (Phyx; v-0.5.5) A preprocesor and library which allow you to create dynamic libs from arbitrary annotated Haskell programs with one click. It also allows you to use the generated lib in C, C++, and C# just by including the generated header files. [2] http://goo.gl/xCSXc * Netwire (Ertugrul Soeylemez; 1.2.0) Lots of new features! [3] http://goo.gl/VCwb1 * network-address (Sebastian Nowicki; 0.2.0) Provides data structures and textual representation of network addresses (IPv4, IPv6, subnets). [4] http://goo.gl/DBRI6 * Webrexp (Vincent Berthoux; 1.1) A web scraping command line utility. [5] http://goo.gl/OlovQ * eddie (Mike Meyer; 0.5) Is a tool for applying haskell filters to text files via the unix command line. [6] http://goo.gl/NPc0b * cabal-ghci (Etienne Laurin; 0.1) Package to ease the development of projects using cabal. [7] http://goo.gl/fiDKZ Quotes of the Week * gosu: Type parameters are covariant. This is not sound, and that does not matter. * turtlesalltheway: if haskell is so great why cant it improve itself * mm_freak: bosses are generally quite strong, static and lazy * cmccann: newtype Natural = N { denature :: Integer } Top Reddit Stories * Constraint Kinds for GHC Domain: blog.omega-prime.co.uk, Score: 115, Comments: 12 On Reddit: [8] http://goo.gl/bCXgf Original: [9] http://goo.gl/7aWzn * Yesod :: The Limitations of Haskell Domain: yesodweb.com, Score: 108, Comments: 42 On Reddit: [10] http://goo.gl/5q7wW Original: [11] http://goo.gl/gisIh * Frege: haskell like language on JVM (tries to adhere to haskell 2010 where possible) Domain: code.google.com, Score: 58, Comments: 58 On Reddit: [12] http://goo.gl/6KWEg Original: [13] http://goo.gl/56AkX * Sharing in Haskell – How the let and lambda constructs give a precise way to control sharing Domain: neilmitchell.blogspot.com, Score: 34, Comments: 18 On Reddit: [14] http://goo.gl/Uf1vq Original: [15] http://goo.gl/4Hmfu * Let's play a game : How to implement functions from their type signatures Domain: blog.ezyang.com, Score: 24, Comments: 13 On Reddit: [16] http://goo.gl/T2FiD Original: [17] http://goo.gl/SmbYO * Impredicativity + injectivity + type case analysis = inconsistency (Russell paradox) :: Oleg Domain: okmij.org, Score: 23, Comments: 10 On Reddit: [18] http://goo.gl/zoThI Original: [19] http://goo.gl/jFr5U * Functional Pearls Domain: haskell.org, Score: 23, Comments: 1 On Reddit: [20] http://goo.gl/RVyng Original: [21] http://goo.gl/1A7t0 * An EventSource broker written in Haskell Domain: mathias-biilmann.net, Score: 22, Comments: 0 On Reddit: [22] http://goo.gl/7yywu Original: [23] http://goo.gl/Y5mGj * Haskell For Kids: Week 4 Domain: cdsmith.wordpress.com, Score: 22, Comments: 2 On Reddit: [24] http://goo.gl/KwlqD Original: [25] http://goo.gl/xlNh2 * apfelmus - Vault - a persistent store for values of arbitrary types Domain: apfelmus.nfshost.com, Score: 19, Comments: 2 On Reddit: [26] http://goo.gl/VAE4n Original: [27] http://goo.gl/vvQ7A * Tau is available in Haskell, you can safely avoid Pi Domain: hackage.haskell.org, Score: 19, Comments: 26 On Reddit: [28] http://goo.gl/u5GN8 Original: [29] http://goo.gl/VnrMh * Zipper from any Traversable :: Oleg Domain: okmij.org, Score: 18, Comments: 2 On Reddit: [30] http://goo.gl/xi4ZF Original: [31] http://goo.gl/nqZ3T Top StackOverflow Questions * More on generic Scala functions votes: 20, answers: 4 Read on SO: [32] http://goo.gl/DGH14 * Why is a “type class” called “type class”? votes: 20, answers: 2 Read on SO: [33] http://goo.gl/YbVXX * Is there a Haskell idiom for updating a nested data structure? votes: 14, answers: 2 Read on SO: [34] http://goo.gl/jKEjv * How to tell if a list is infinite? votes: 14, answers: 4 Read on SO: [35] http://goo.gl/fc3e6 * Select random element from a set, faster than linear time (Haskell) votes: 9, answers: 5 Read on SO: [36] http://goo.gl/IRJf3 * GHC not optimising modules other than the main module votes: 9, answers: 0 Read on SO: [37] http://goo.gl/8Ephm * A chess board representation in Haskell votes: 8, answers: 4 Read on SO: [38] http://goo.gl/iSM7d * How to cap memory usage of Haskell threads votes: 7, answers: 2 Read on SO: [39] http://goo.gl/dvLnE * Is this Haskell type inference in action, or something else? votes: 7, answers: 2 Read on SO: [40] http://goo.gl/hTaK7 * Assymmetry in the bind function votes: 6, answers: 7 Read on SO: [41] http://goo.gl/KqMTn About the Haskell Weekly News To help create new editions of this newsletter, please send stories to dstcruz@gmail.com. Until next time, Daniel Santa Cruz References 1. http://permalink.gmane.org/gmane.comp.lang.haskell.cafe/92287 2. http://permalink.gmane.org/gmane.comp.lang.haskell.cafe/92182 3. http://permalink.gmane.org/gmane.comp.lang.haskell.cafe/92225 4. http://permalink.gmane.org/gmane.comp.lang.haskell.general/18916 5. http://permalink.gmane.org/gmane.comp.lang.haskell.general/18929 6. http://permalink.gmane.org/gmane.comp.lang.haskell.general/18930 7. http://permalink.gmane.org/gmane.comp.lang.haskell.cafe/92279 8. http://blog.omega-prime.co.uk/?p=127 9. http://www.reddit.com/r/haskell/comments/kbf14/constraint_kinds_for_ghc/ 10. http://www.yesodweb.com/blog/2011/09/limitations-of-haskell 11. http://www.reddit.com/r/haskell/comments/k4lc4/yesod_the_limitations_of_hask... 12. http://code.google.com/p/frege/ 13. http://www.reddit.com/r/haskell/comments/kadx6/frege_haskell_like_language_o... 14. http://neilmitchell.blogspot.com/2011/09/sharing-in-haskell.html 15. http://www.reddit.com/r/haskell/comments/k4bq9/sharing_in_haskell_how_the_le... 16. http://blog.ezyang.com/2011/09/lets-play-a-game/ 17. http://www.reddit.com/r/haskell/comments/k5okh/lets_play_a_game_how_to_imple... 18. http://okmij.org/ftp/Haskell/impredicativity-bites.html 19. http://www.reddit.com/r/haskell/comments/k5bdb/impredicativity_injectivity_t... 20. http://www.haskell.org/haskellwiki/Research_papers/Functional_pearls 21. http://www.reddit.com/r/haskell/comments/kb3w5/functional_pearls/ 22. http://mathias-biilmann.net/posts/2011/9/a-haskell-eventsource-broker 23. http://www.reddit.com/r/haskell/comments/k6fva/an_eventsource_broker_written... 24. http://cdsmith.wordpress.com/2011/09/10/haskell-for-kids-week-4/ 25. http://www.reddit.com/r/haskell/comments/kbqn0/haskell_for_kids_week_4/ 26. http://apfelmus.nfshost.com/blog/2011/09/04-vault.html 27. http://www.reddit.com/r/haskell/comments/k4l6c/apfelmus_vault_a_persistent_s... 28. http://hackage.haskell.org/package/tau 29. http://www.reddit.com/r/haskell/comments/kazfn/tau_is_available_in_haskell_y... 30. http://okmij.org/ftp/continuations/zipper.html#traversable 31. http://www.reddit.com/r/haskell/comments/k5bci/zipper_from_any_traversable_o... 32. http://stackoverflow.com/questions/7337582/more-on-generic-scala-functions 33. http://stackoverflow.com/questions/7360024/why-is-a-type-class-called-type-c... 34. http://stackoverflow.com/questions/7365425/is-there-a-haskell-idiom-for-upda... 35. http://stackoverflow.com/questions/7371730/how-to-tell-if-a-list-is-infinite 36. http://stackoverflow.com/questions/7349080/select-random-element-from-a-set-... 37. http://stackoverflow.com/questions/7367070/ghc-not-optimising-modules-other-... 38. http://stackoverflow.com/questions/7309554/a-chess-board-representation-in-h... 39. http://stackoverflow.com/questions/7297654/how-to-cap-memory-usage-of-haskel... 40. http://stackoverflow.com/questions/7342222/is-this-haskell-type-inference-in... 41. http://stackoverflow.com/questions/7319424/assymmetry-in-the-bind-function