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 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_haskell/

12. http://code.google.com/p/frege/

13. http://www.reddit.com/r/haskell/comments/kadx6/frege_haskell_like_language_on_jvm_tries_to/

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_let_and_lambda/

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_implement_functions_from/

18. http://okmij.org/ftp/Haskell/impredicativity-bites.html

19. http://www.reddit.com/r/haskell/comments/k5bdb/impredicativity_injectivity_type_case_analysis/

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_in_haskell/

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_store_for_values_of/

28. http://hackage.haskell.org/package/tau

29. http://www.reddit.com/r/haskell/comments/kazfn/tau_is_available_in_haskell_you_can_safely_avoid/

30. http://okmij.org/ftp/continuations/zipper.html#traversable

31. http://www.reddit.com/r/haskell/comments/k5bci/zipper_from_any_traversable_oleg/

32. http://stackoverflow.com/questions/7337582/more-on-generic-scala-functions

33. http://stackoverflow.com/questions/7360024/why-is-a-type-class-called-type-class

34. http://stackoverflow.com/questions/7365425/is-there-a-haskell-idiom-for-updating-a-nested-data-structure

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-faster-than-linear-time-haskell

37. http://stackoverflow.com/questions/7367070/ghc-not-optimising-modules-other-than-the-main-module

38. http://stackoverflow.com/questions/7309554/a-chess-board-representation-in-haskell

39. http://stackoverflow.com/questions/7297654/how-to-cap-memory-usage-of-haskell-threads

40. http://stackoverflow.com/questions/7342222/is-this-haskell-type-inference-in-action-or-something-else

41. http://stackoverflow.com/questions/7319424/assymmetry-in-the-bind-function