[Haskell] Haskell Weekly News: Issue 175
Daniel Santa Cruz
dstcruz at gmail.com
Thu Mar 31 04:26:03 CEST 2011
Welcome to issue 175 of the HWN, a newsletter covering developments in
the [1]Haskell community. This release covers the week of March 20 -
26.
You can find the HTML version at: http://bit.ly/gs9Rr8
Announcements
Wren Ng Thornton [2]announced the release of unix-bytestring:
Unix/Posix-specific functions for ByteStrengs.
John Lato [3]announced an incremental update to the ListLike package.
"This version adds newtype wrappers for strict and lazy ByteString,
CharString, and CharStringLazy..."
Mario Blazevic [4]announced the release of incremental-parser, which
provides the usual set of Applicative and monad combinators with a few
twists that make it unique.
Duncan Coutts [5]announced the release of version 0.16.3 of c2hs, the
FFI preprocessor tool.
Jeff Wheeler [6]announced a new release of Yi, the text editor written
in and extensible in Haskell.
Christiaan Baaij [7]announced an incremental upgrade to 0.1.3.0 to
CLaSH.
Mario Blazevic [8]announced updates to monad-parallel, monad-coroutine,
and SCC (Streaming Component Combinators).
John Millikin [9]announced an update to enumerator to version 0.4.8.
Quotes of the Week
* Squarism: wo utilizing any tricks, i want 20 miljon rabbits to mate
with each other once.. how many mate event will there be
* mm_freak: using combinators instead of explicit recursion can be
justified with about the same reasoning as using 'while' instead of
explicit 'goto' in imperative programming
* monochrom: <$> is pronounced Jacquelin von Brionée
* geheimdienst: what does a pirate say when starting a sentence, then
suddenly being hit in the nadgers? arr- ow!
* monochrom: 1985 is way more than a decade ago
* copumpkin: matlab is horrible as far as language design goes[.]
it's fairly convenient for doing stuff in but I need to shower
after every time I use it
Top Reddit Stories
* Debugging trick
From (self.haskell), scored 60 with 11 comments.
Read on [10]reddit.
* Your friendly Haskell JSON library's encoding performance just got
4x faster
From (serpentine.com), scored 45 with 2 comments.
Read on [12]reddit.
Read the [13]original post.
* A monad for deterministic parallelism (ICFP'2011 submission)
From (community.haskell.org), scored 41 with 8 comments.
Read on [14]reddit.
Read the [15]original post.
* Haskell servers benchmarked against node/ruby/python/php/java.
From (docs.yesodweb.com), scored 36 with 12 comments.
Read on [16]reddit.
Read the [17]original post.
* The Yesod Framework and the Case of the Eight Level Monad
Transformer Stack
From (docs.yesodweb.com), scored 35 with 16 comments.
Read on [18]reddit.
Read the [19]original post.
* Improving Persistent Performance (Yesod Blog)
From (docs.yesodweb.com), scored 29 with 1 comments.
Read on [20]reddit.
Read the [21]original post.
* Fast, clean Haskell bindings to Google's Snappy library
From (hackage.haskell.org), scored 22 with 8 comments.
Read on [22]reddit.
Read the [23]original post.
* Open Quark on Github (Haskell like Lang on the JVM)
From (github.com), scored 15 with 3 comments.
Read on [24]reddit.
Read the [25]original post.
* EclipseFP 2.0.4 released: supports GHC 7
From (jpmoresmau.blogspot.com), scored 15 with 7 comments.
Read on [26]reddit.
Read the [27]original post.
* Demonstrating a Time Leak in Arrowized FRP
From (blog.edwardamsden.com), scored 14 with 12 comments.
Read on [28]reddit.
Read the [29]original post.
Top StackOverflow Answers
* [30]Reading large file in haskell ? votes: 19
The construct "seq x x" is always useless. If y = seq x x and I force
y then this forces x then returns x. This is equivalent to y=x and
forcing y. Thus "seq forceEval forceEval" does nothing more than
"forceEval".
The error with your use of a fold is a common one.
You are using a fold to perform a count of the bytes in the
input. You should be using ...
* [31]What to call a function that splits lists? votes: 12
I believe the function you're describing is breakBefore from
the list-grouping package.
Data.List.Grouping:
http://hackage.haskell.org/packages/archive/list-grouping/0.1.1/doc/html/Data-Li
st-Grouping.html
ghci:: breakBefore even
[3,1,4,1,5,9,2,6,5,3,5,8,9,7,9,3,2,3,8,4,6,2,6]
[[3,1],[4,1,5,9],[2],[6,5,3,5],[8,9,7,9,3],[2,3],[8],[4],[6],[2],[6]]
Top StackOverflow Questions
* [32]Haskell record syntax
votes: 16, answers: 1
* [33]Reading large file in haskell?
votes: 12, answers: 1
* [34]Haskell laziness - how do I force the IO to happen sooner?
votes: 9, answers: 3
* [35]case on monadic value
votes: 7, answers: 2
* [36]Simplest way to find which data types are most garbage
collected?
votes: 7, answers: 2
About the Haskell Weekly News
To help create new editions of this newsletter, please send stories to
dstcruz at gmail.com. I'm in dire need of finding good "quotes of the
week". If you happen to come across any, please don't hesitate to send
it along.
Until next time,
Daniel Santa Cruz
References
1. http://haskell.org/
2. http://article.gmane.org/gmane.comp.lang.haskell.libraries/15484
3. http://article.gmane.org/gmane.comp.lang.haskell.general/18590
4. http://article.gmane.org/gmane.comp.lang.haskell.libraries/15492
5. http://article.gmane.org/gmane.comp.programming.c2hs/247
6. http://article.gmane.org/gmane.editors.yi.devel/5346
7. http://article.gmane.org/gmane.comp.lang.haskell.general/18592
8. http://article.gmane.org/gmane.comp.lang.haskell.cafe/87540
9. http://article.gmane.org/gmane.comp.lang.haskell.libraries/15506
10. http://www.reddit.com/r/haskell/comments/gbd7w/debugging_trick/
12. http://www.reddit.com/r/haskell/comments/g8s0t/your_friendly_haskell_json_librarys_encoding/
13. http://www.serpentine.com/blog/2011/03/22/a-new-week-a-new-json-performance-improvement/
14. http://www.reddit.com/r/haskell/comments/gainp/a_monad_for_deterministic_parallelism_icfp2011/
15. http://community.haskell.org/~simonmar/papers/monad-par.pdf
16. http://www.reddit.com/r/haskell/comments/g7uia/haskell_servers_benchmarked_against/
17. http://docs.yesodweb.com/blog/preliminary-warp-cross-language-benchmarks
18. http://www.reddit.com/r/haskell/comments/ga40w/the_yesod_framework_and_the_case_of_the_eight/
19. http://docs.yesodweb.com/blog/hamlet-lucius-widgets
20. http://www.reddit.com/r/haskell/comments/gbz43/improving_persistent_performance_yesod_blog/
21. http://docs.yesodweb.com/blog/improving-persistent-performance
22. http://www.reddit.com/r/haskell/comments/ga080/fast_clean_haskell_bindings_to_googles_snappy/
23. http://hackage.haskell.org/package/snappy
24. http://www.reddit.com/r/haskell/comments/g7vcj/open_quark_on_github_haskell_like_lang_on_the_jvm/
25. https://github.com/levans/Open-Quark
26. http://www.reddit.com/r/haskell/comments/g8du0/eclipsefp_204_released_supports_ghc_7/
27. http://jpmoresmau.blogspot.com/2011/03/eclipsefp-204-released-supports-ghc-7.html
28. http://www.reddit.com/r/haskell/comments/g943x/demonstrating_a_time_leak_in_arrowized_frp/
29. http://blog.edwardamsden.com/2011/03/demonstrating-time-leak-in-arrowized.html
30. http://stackoverflow.com/questions/5410777/reading-large-file-in-haskell/5411119#5411119
31. http://stackoverflow.com/questions/5438558/what-to-call-a-function-that-splits-lists/5438633#5438633
32. http://stackoverflow.com/questions/5367167/haskell-record-syntax
33. http://stackoverflow.com/questions/5410777/reading-large-file-in-haskell
34. http://stackoverflow.com/questions/5373883/haskell-laziness-how-do-i-force-the-io-to-happen-sooner
35. http://stackoverflow.com/questions/5395517/case-on-monadic-value
36. http://stackoverflow.com/questions/5410345/simplest-way-to-find-which-data-types-are-most-garbage-collected
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