Welcome to issue 223 of the HWN, an issue covering crowd-sourced bits of information about Haskell from around the web. This issue covers the week of April 8 to 14, 2012. Quotes of the Week * merijn: I'm tempted to just do unsafePerformIO newEmptyMVar at the top level quicksilver: I can't really be expected to deal with your sinfulness. That's between you and your god. * acowley: Good haskell code is 20 LANGUAGE pragmas, 40 imports, then one line of perl. * deggis: oh. running GHC HEAD. must try that next week if coffee just someday isn't enough * dmwit: hGetContents does not close its handle. dmwit: hGetContents semicloses its handle. * monochrom: isTrue = (unsafeCoerce :: Either a b -> Bool) . (unsafeCoerce :: Maybe c -> Either a b) . (unsafeCoerce :: Bool -> Maybe c) * dmwit: For basically all good properties P, IEEE 754 is not P. * Cale: Little known fact: For any positive integer n, the infinite sequence of Project Euler problems has only finitely many elements whose solution is not divisible by n. Top Reddit Stories * Announcing Yesod 1.0 Domain: yesodweb.com, Score: 101, Comments: 42 On Reddit: [1] http://goo.gl/izD19 Original: [2] http://goo.gl/oTSto * Why reasoning about space usage in Haskell is hard Domain: ro-che.info, Score: 63, Comments: 14 On Reddit: [3] http://goo.gl/yIkI4 Original: [4] http://goo.gl/IAQtu * GHC HEAD now has type level natural number/ literals Domain: github.com, Score: 63, Comments: 18 On Reddit: [5] http://goo.gl/GfGbB Original: [6] http://goo.gl/Lkp6v * Working Together Domain: yesodweb.com, Score: 62, Comments: 31 On Reddit: [7] http://goo.gl/o3G85 Original: [8] http://goo.gl/jBdJA * How less is more : polymorphic types can improve safety even in monomorphic functions Domain: blog.malde.org, Score: 61, Comments: 13 On Reddit: [9] http://goo.gl/fzUlO Original: [10] http://goo.gl/WHE3A * A Hopefully Fair and Useful Comparison of Haskell Web Frameworks Domain: softwaresimply.blogspot.com, Score: 60, Comments: 30 On Reddit: [11] http://goo.gl/WuDuL Original: [12] http://goo.gl/DXBA8 * First impressions of Haskell: A review of my Haskell adventure Domain: binarysculpting.com, Score: 46, Comments: 36 On Reddit: [13] http://goo.gl/gG0fl Original: [14] http://goo.gl/ZqUT3 * A "radix tree" import syntax? Domain: self.haskell, Score: 41, Comments: 26 On Reddit: [15] http://goo.gl/kBOLZ Original: [16] http://goo.gl/kBOLZ * Using ContT to please the eye Domain: self.haskell, Score: 28, Comments: 15 On Reddit: [17] http://goo.gl/hbFrs Original: [18] http://goo.gl/hbFrs * Designing a DCPU-16 emulator in Haskell: on determinism and I/O Domain: jaspervdj.be, Score: 28, Comments: 6 On Reddit: [19] http://goo.gl/KHIgP Original: [20] http://goo.gl/NT89i Top StackOverflow Questions * What are type quantifiers? votes: 15, answers: 3 Read on SO: [21] http://goo.gl/d3hnH * Haskell: How does 'atomicModifyIORef' work? votes: 12, answers: 2 Read on SO: [22] http://goo.gl/3b5dK * Is there a runtime penalty associated with typeclasses? votes: 12, answers: 1 Read on SO: [23] http://goo.gl/Isw7k * Timing out pure functions votes: 11, answers: 1 Read on SO: [24] http://goo.gl/aTzVG * Haskell - simple constructor comparison (?) function votes: 11, answers: 3 Read on SO: [25] http://goo.gl/ZC6CC * Partial Application with Infix Functions votes: 10, answers: 3 Read on SO: [26] http://goo.gl/QvabF * Haskell: Why is there no type mismatch (and why does this compile)? votes: 9, answers: 2 Read on SO: [27] http://goo.gl/1gxFE * “Dependent optional” data in Haskell votes: 9, answers: 4 Read on SO: [28] http://goo.gl/9K5Wx * How can I help SpecConstr in GHC? votes: 8, answers: 2 Read on SO: [29] http://goo.gl/PGa4C * How to get good performance when writing a list of integers from 1 to 10 million to a file? votes: 7, answers: 2 Read on SO: [30] http://goo.gl/Kym6r * Efficiently turn a ByteString into a hex representation votes: 7, answers: 1 Read on SO: [31] http://goo.gl/aq2ct Until next time, Daniel Santa Cruz References 1. http://www.yesodweb.com/blog/2012/04/announcing-yesod-1-0 2. http://www.reddit.com/r/haskell/comments/s0tr2/announcing_yesod_10/ 3. http://ro-che.info/articles/2012-04-08-space-usage-reasoning.html 4. http://www.reddit.com/r/haskell/comments/rzu8a/why_reasoning_about_space_usa... 5. https://github.com/ghc/packages-base/blob/b5b5ec18819fb85ebf1bdb6345ac031787... 6. http://www.reddit.com/r/haskell/comments/s0vln/ghc_head_now_has_type_level_n... 7. http://www.yesodweb.com/blog/2012/04/working-together 8. http://www.reddit.com/r/haskell/comments/s2ei5/working_together/ 9. http://blog.malde.org/posts/polymorphic-types-are-safer.html 10. http://www.reddit.com/r/haskell/comments/s7q3b/how_less_is_more_polymorphic_... 11. http://softwaresimply.blogspot.com/2012/04/hopefully-fair-and-useful-compari... 12. http://www.reddit.com/r/haskell/comments/s3pbm/a_hopefully_fair_and_useful_c... 13. http://binarysculpting.com/2012/04/12/a-review-of-my-haskell-adventure/ 14. http://www.reddit.com/r/haskell/comments/s6okb/first_impressions_of_haskell_... 15. http://www.reddit.com/r/haskell/comments/s2o8p/a_radix_tree_import_syntax/ 16. http://www.reddit.com/r/haskell/comments/s2o8p/a_radix_tree_import_syntax/ 17. http://www.reddit.com/r/haskell/comments/s49kk/using_contt_to_please_the_eye... 18. http://www.reddit.com/r/haskell/comments/s49kk/using_contt_to_please_the_eye... 19. http://jaspervdj.be/posts/2012-04-12-st-io-dcpu-16.html 20. http://www.reddit.com/r/haskell/comments/s5xqb/designing_a_dcpu16_emulator_i... 21. http://stackoverflow.com/questions/10062253/what-are-type-quantifiers 22. http://stackoverflow.com/questions/10102881/haskell-how-does-atomicmodifyior... 23. http://stackoverflow.com/questions/10148897/is-there-a-runtime-penalty-assoc... 24. http://stackoverflow.com/questions/10071560/timing-out-pure-functions 25. http://stackoverflow.com/questions/10112733/haskell-simple-constructor-compa... 26. http://stackoverflow.com/questions/10131300/partial-application-with-infix-f... 27. http://stackoverflow.com/questions/10091874/haskell-why-is-there-no-type-mis... 28. http://stackoverflow.com/questions/10136222/dependent-optional-data-in-haske... 29. http://stackoverflow.com/questions/10145954/how-can-i-help-specconstr-in-ghc 30. http://stackoverflow.com/questions/10080273/how-to-get-good-performance-when... 31. http://stackoverflow.com/questions/10099921/efficiently-turn-a-bytestring-in...