Welcome to issue 314 of the HWN, an issue covering crowd-sourced bits of information about Haskell from around the web. This issue covers from December 7, 2014 to January 3, 2015 I know... I know. It's been a while Quotes of the Week * arianvp__: after 5 hours of hacking my code works || now its 3 am || Types make a lot more sense when I'm tired for some reason * dmwit: "Any coder worth his salt can do the impossible." * hodapp: Math is too hard. Let's use JavaScript. * Zemyla: I imagine if [Edward Kmett] had found C++, he would be writing template definitions that would make the faces of the Boost team melt off. Top Reddit Stories * Kronos Haskell Notebook (Mac App) Domain: kronosnotebook.com, Score: 114, Comments: 21 Original: [1] http://goo.gl/nOnLuz On Reddit: [2] http://goo.gl/SNLxjo * The "What Are Monads?" Fallacy Domain: two-wrongs.com, Score: 112, Comments: 93 Original: [3] http://goo.gl/Beu6wO On Reddit: [4] http://goo.gl/CxcK1f * Learn You Some Algebras for Glorious Good! - A fun, easy-to-read math textbook. Domain: self.haskell, Score: 109, Comments: 106 Original: [5] http://goo.gl/3623n6 On Reddit: [6] http://goo.gl/3623n6 * GHC illustrated [PDF] Domain: takenobu-hs.github.io, Score: 108, Comments: 30 Original: [7] http://goo.gl/yj7ySL On Reddit: [8] http://goo.gl/sro7qH * The Haskell Cast #9 - Conal Elliott on FRP and Denotational Design Domain: haskellcast.com, Score: 94, Comments: 34 Original: [9] http://goo.gl/tls8K3 On Reddit: [10] http://goo.gl/NIJZ1X * GHC 7.10.1 will support 'static values', allowing you to create stable references to values across programs/machines for serialization, RPC, etc... Domain: phabricator.haskell.org, Score: 91, Comments: 26 Original: [11] http://goo.gl/bsfROl On Reddit: [12] http://goo.gl/weGkIq * 24 Days of GHC Extensions: Thanks! Domain: ocharles.org.uk, Score: 82, Comments: 11 Original: [13] http://goo.gl/6ee2Jb On Reddit: [14] http://goo.gl/CYoai5 * git clone in Haskell from the bottom up Domain: stefan.saasen.me, Score: 81, Comments: 9 Original: [15] http://goo.gl/nWSXV On Reddit: [16] http://goo.gl/ULS3YO * A commentary on 24 days of GHC extensions Domain: augustss.blogspot.com, Score: 78, Comments: 5 Original: [17] http://goo.gl/C4nKNN On Reddit: [18] http://goo.gl/cGBdss * Haskell for all: A very general API for relational joins Domain: haskellforall.com, Score: 77, Comments: 29 Original: [19] http://goo.gl/WVGtQl On Reddit: [20] http://goo.gl/8McEkB * Elm 0.14 - Simpler Core, Better Tools Domain: elm-lang.org, Score: 76, Comments: 38 Original: [21] http://goo.gl/7Oq4Xe On Reddit: [22] http://goo.gl/e9wbAm * Rethinking webservice and APIs in Haskell: servant 0.2 Domain: alpmestan.com, Score: 74, Comments: 59 Original: [23] http://goo.gl/Jl2CMS On Reddit: [24] http://goo.gl/HsB5zi * ANNOUNCE: GHC 7.10.1 Release Candidate 1 Domain: permalink.gmane.org, Score: 74, Comments: 4 Original: [25] http://goo.gl/I9ezar On Reddit: [26] http://goo.gl/SRNHG9 * 24 Days of GHC Extensions: Rank N Types Domain: ocharles.org.uk, Score: 69, Comments: 27 Original: [27] http://goo.gl/1OuyNg On Reddit: [28] http://goo.gl/5m79zT * A Haskell Implementation Reading List Domain: stephendiehl.com, Score: 66, Comments: 0 Original: [29] http://goo.gl/YnFyTs On Reddit: [30] http://goo.gl/3TudIF * Learning Curves for different programming languages (including Haskell) Domain: github.com, Score: 66, Comments: 106 Original: [31] http://goo.gl/SxsT10 On Reddit: [32] http://goo.gl/KNsLqh * Functional Education Domain: bitemyapp.com, Score: 66, Comments: 10 Original: [33] http://goo.gl/f4EI02 On Reddit: [34] http://goo.gl/wDxjkj * Snowdrift.coop hiring lead programmer (Haskell/Yesod) Domain: snowdrift.coop, Score: 65, Comments: 8 Original: [35] http://goo.gl/Nh0GL2 On Reddit: [36] http://goo.gl/8tLsy8 * 24 Days of GHC Extensions: Functional Dependencies Domain: ocharles.org.uk, Score: 58, Comments: 4 Original: [37] http://goo.gl/mBkf8n On Reddit: [38] http://goo.gl/uv3Mhs * So you want to learn type theory... but where to start? Here are some suggestions. Domain: purelytheoretical.com, Score: 58, Comments: 9 Original: [39] http://goo.gl/z73MMM On Reddit: [40] http://goo.gl/9AuJJl * 24 Days of Hackage: Static Pointers (guest post by Mathieu Boespflug) Domain: ocharles.org.uk, Score: 57, Comments: 32 Original: [41] http://goo.gl/4mhlNL On Reddit: [42] http://goo.gl/jsSYr9 * 24 Days of GHC Extensions: Type Families Domain: ocharles.org.uk, Score: 56, Comments: 11 Original: [43] http://goo.gl/uwLBsA On Reddit: [44] http://goo.gl/ykn06l * 24 Days of GHC Extensions: Nullary Type Classes Domain: ocharles.org.uk, Score: 54, Comments: 23 Original: [45] http://goo.gl/4k5bQw On Reddit: [46] http://goo.gl/crIJbb * 24 Days of GHC Extensions: DeriveGeneric Domain: ocharles.org.uk, Score: 54, Comments: 27 Original: [47] http://goo.gl/gKijr1 On Reddit: [48] http://goo.gl/SRMNuR * 24 Days of GHC Extensions: Existential Quantification (guest post by Roman Cheplyaka) Domain: ocharles.org.uk, Score: 54, Comments: 0 Original: [49] http://goo.gl/wXwsDU On Reddit: [50] http://goo.gl/vLaS92 * 24 Days of GHC Extensions: Multi-parameter Type Classes Domain: ocharles.org.uk, Score: 52, Comments: 11 Original: [51] http://goo.gl/2sWnsC On Reddit: [52] http://goo.gl/h4mRBb * A demo written in Haskell got 3rd place in Experience Domain: youtube.com, Score: 48, Comments: 37 Original: [53] http://goo.gl/9l7B6h On Reddit: [54] http://goo.gl/8Np97P * 24 Days of GHC Extensions: Overloaded Strings Domain: ocharles.org.uk, Score: 48, Comments: 23 Original: [55] http://goo.gl/u6aiAi On Reddit: [56] http://goo.gl/Xtww0S * Intro to Machines & Arrows (Part 1: Stream and Auto) Domain: blog.jle.im, Score: 48, Comments: 25 Original: [57] http://goo.gl/MwouKm On Reddit: [58] http://goo.gl/934frV * 24 Days of GHC Extensions: Recursive Do Domain: ocharles.org.uk, Score: 47, Comments: 7 Original: [59] http://goo.gl/iejmP8 On Reddit: [60] http://goo.gl/H8uEQS * 24 Days of GHC Extensions: Scoped Type Variables (guest post by Tim Docker) Domain: ocharles.org.uk, Score: 47, Comments: 18 Original: [61] http://goo.gl/sWS0dT On Reddit: [62] http://goo.gl/jFPZAC * ANNOUNCE: GHC version 7.8.4 Domain: permalink.gmane.org, Score: 47, Comments: 19 Original: [63] http://goo.gl/0ygVbv On Reddit: [64] http://goo.gl/2eWUsJ * Categories Great and Small (From Bartosz Milewski's Categories for Programmers series) Domain: bartoszmilewski.com, Score: 46, Comments: 8 Original: [65] http://goo.gl/NfpA7X On Reddit: [66] http://goo.gl/ghq472 * Denotational design does not work Domain: ro-che.info, Score: 45, Comments: 39 Original: [67] http://goo.gl/8hOm0A On Reddit: [68] http://goo.gl/tf4JVc Top StackOverflow Questions * What is happening when I compose * with + in Haskell? votes: 35, answers: 5 Read on SO: [69] http://goo.gl/S9h6Xi * Difference in performance of compiled accelerate code ran from ghci and shell votes: 22, answers: 0 Read on SO: [70] http://goo.gl/zxojbX * Why does this Haskell program diverge? votes: 20, answers: 1 Read on SO: [71] http://goo.gl/NDasIA * Is it possible to skip the nursery? votes: 20, answers: 1 Read on SO: [72] http://goo.gl/Qk4K5i * Haskell performance implementing unix's “cat” program with Data.ByteString votes: 19, answers: 3 Read on SO: [73] http://goo.gl/ekoeor * showsPrec and operator precedences votes: 15, answers: 1 Read on SO: [74] http://goo.gl/ifxaUB * Why does let y = 1 + y compile, and what does it mean? votes: 15, answers: 1 Read on SO: [75] http://goo.gl/vp1Q02 * Type Family Shenanigans in GHCi votes: 13, answers: 1 Read on SO: [76] http://goo.gl/fvJzzO * Quirkiness in Haskell 7.8.3 votes: 13, answers: 1 Read on SO: [77] http://goo.gl/KprcEM * What is the difference between value constructors and tuples? votes: 11, answers: 2 Read on SO: [78] http://goo.gl/5ybmYY * Efficient version of 'inits' votes: 11, answers: 2 Read on SO: [79] http://goo.gl/Qwoirp * Working out the details of a type indexed free monad votes: 11, answers: 7 Read on SO: [80] http://goo.gl/oMjYQn * How to model a currencies, money, and banks that exchange money between currencies? votes: 10, answers: 3 Read on SO: [81] http://goo.gl/svZY2T * Why are these functions differently evaluated votes: 10, answers: 2 Read on SO: [82] http://goo.gl/nrD5pA * Why does a more general type affect runtime in Haskell? votes: 10, answers: 2 Read on SO: [83] http://goo.gl/oVeQKg * List based on right Kan extension votes: 9, answers: 2 Read on SO: [84] http://goo.gl/VxPhv0 * How to inject the result of an IO action into a non-IO monadic computation votes: 9, answers: 3 Read on SO: [85] http://goo.gl/WzrvDP * Why I get the “class Num a where” instead of the “class (Eq a, Show a) => Num a”? votes: 9, answers: 4 Read on SO: [86] http://goo.gl/glKEeK * How to avoid default return value when accessing a non-existent field with lenses? votes: 9, answers: 2 Read on SO: [87] http://goo.gl/RROrVM * How much does Haskell/GHC memoize? votes: 9, answers: 1 Read on SO: [88] http://goo.gl/PuUKt4 Until next time, [89]+Daniel Santa Cruz References 1. http://www.kronosnotebook.com/haskell 2. http://www.reddit.com/r/haskell/comments/2r43q0/kronos_haskell_notebook_mac_... 3. http://two-wrongs.com/the-what-are-monads-fallacy 4. http://www.reddit.com/r/haskell/comments/2r2cpe/the_what_are_monads_fallacy/ 5. http://www.reddit.com/r/haskell/comments/2qu7w8/learn_you_some_algebras_for_... 6. http://www.reddit.com/r/haskell/comments/2qu7w8/learn_you_some_algebras_for_... 7. http://takenobu-hs.github.io/downloads/haskell_ghc_illustrated.pdf 8. http://www.reddit.com/r/haskell/comments/2qxcmz/ghc_illustrated_pdf/ 9. http://www.haskellcast.com/episode/009-conal-elliott-on-frp-and-denotational... 10. http://www.reddit.com/r/haskell/comments/2pdhe9/the_haskell_cast_9_conal_ell... 11. https://phabricator.haskell.org/rGHCfc45f32491313d2a44e72d8d59cdf95b1660189d 12. http://www.reddit.com/r/haskell/comments/2otl0f/ghc_7101_will_support_static... 13. https://ocharles.org.uk/blog/posts/2014-12-24-conclusion.html 14. 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http://www.reddit.com/r/haskell/comments/2q6oln/announce_ghc_version_784/ 65. http://bartoszmilewski.com/2014/12/05/categories-great-and-small/ 66. http://www.reddit.com/r/haskell/comments/2phex1/categories_great_and_small_f... 67. http://ro-che.info/articles/2014-12-31-denotational-design-does-not-work 68. http://www.reddit.com/r/haskell/comments/2qvbhp/denotational_design_does_not... 69. http://stackoverflow.com/questions/27664213/what-is-happening-when-i-compose... 70. http://stackoverflow.com/questions/27541609/difference-in-performance-of-com... 71. http://stackoverflow.com/questions/27421598/why-does-this-haskell-program-di... 72. http://stackoverflow.com/questions/27630833/is-it-possible-to-skip-the-nurse... 73. http://stackoverflow.com/questions/27463669/haskell-performance-implementing... 74. http://stackoverflow.com/questions/27471937/showsprec-and-operator-precedenc... 75. http://stackoverflow.com/questions/27557380/why-does-let-y-1-y-compile-and-w... 76. http://stackoverflow.com/questions/27490352/type-family-shenanigans-in-ghci 77. http://stackoverflow.com/questions/27663435/quirkiness-in-haskell-7-8-3 78. http://stackoverflow.com/questions/27476446/what-is-the-difference-between-v... 79. http://stackoverflow.com/questions/27672585/efficient-version-of-inits 80. http://stackoverflow.com/questions/27676294/working-out-the-details-of-a-typ... 81. http://stackoverflow.com/questions/27408873/how-to-model-a-currencies-money-... 82. http://stackoverflow.com/questions/27568791/why-are-these-functions-differen... 83. http://stackoverflow.com/questions/27683108/why-does-a-more-general-type-aff... 84. http://stackoverflow.com/questions/27381133/list-based-on-right-kan-extensio... 85. http://stackoverflow.com/questions/27391293/how-to-inject-the-result-of-an-i... 86. http://stackoverflow.com/questions/27561604/why-i-get-the-class-num-a-where-... 87. http://stackoverflow.com/questions/27567664/how-to-avoid-default-return-valu... 88. http://stackoverflow.com/questions/27570371/how-much-does-haskell-ghc-memoiz... 89. https://plus.google.com/105107667630152149014/about