Haskell vs. F# vs. Scala: A High-level Language Features and Parallelism Support Comparison
Haskell vs. F# vs. Scala: A High-level Language Features and Parallelism Support Comparison Prabhat Totoo, Pantazis Deligiannis, Hans-Wolfgang Loidl. To appear in FHPC'12, ACM SIGPLAN Workshop on Functional High-Performance Computing, Copenhagen, Denmark, 15 September 2012 This paper provides a performance and programmability comparison of high-level parallel programming support in Haskell, F# and
Announcing esqueleto, a type-safe EDSL for SQL queries – Felipe Lessa
I’m very pleased to announce a preview release of esqueleto, a bare bones, type-safe EDSL for SQL queries. On the first part of this blog post I’ll talk about persistent and HaskellDB. You may jump right into where I talk about esqueleto if you want, though. Background Yesod is very modular, and each of its components may be used separately. You may also take libraries from other web frameworks. H
Haskellã§CIã™ã‚‹ãªã‚‰ - maoeã®ãƒ–ãƒã‚°
函数プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®é›†ã„ã®ãƒ©ãƒ³ãƒã§èžã‹ã‚ŒãŸã®ã§Haskellã®ãƒ†ã‚¹ãƒˆç’°å¢ƒã«ã¤ã„ã¦ã¾ã¨ã‚ã¾ã™ã€‚ githubã«ç½®ã„ã¦ã„るコードをé¢å€’ãªè¨å®šãªã—ã«ãƒ†ã‚¹ãƒˆã—ãŸã„ → cabal test + travis-ciãŒãŠã™ã™ã‚ クãƒãƒ¼ã‚ºãƒ‰ãªã‚³ãƒ¼ãƒ‰ãªã‚“ã ã‘ã©ã€ã©ã†ã—よㆠ→ jenkinsã§ã‚‚セットアップã—ã¾ã—ょㆠもã†å°‘ã—ç´°ã‹ã„メトリクスã¨ã‹ã¨ã‚ŠãŸã„ → test-framework + jenkins cabal test + travis-ci cabal testã«å¯¾å¿œã—ãŸã‚³ãƒ¼ãƒ‰ã‚’GitHubã«ç½®ã„ã¦ã„ã¦ã€ãŠæ‰‹è»½ã«æ¸ˆã¾ã›ãŸã„ãªã‚‰ã“ã‚ŒãŒä¸€ç•ªã§ã™ã€‚特徴ã¯ã€ ã¨ã«ã‹ãカンタン セットアップã¯ãƒªãƒã‚¸ãƒˆãƒªã®ãƒˆãƒƒãƒ—ã«language: haskellã¨ã ã‘書ã„ãŸ.travis.ymlã¨ã„ã†ãƒ•ã‚¡ã‚¤ãƒ«ã‚’ç½®ã„ã¦ã€travis-ciã‹ã‚‰ONã«ã™ã‚‹ã ã‘。 http://about.travis-ci.org/docs
Haskell ã§ã®ãƒ‡ãƒãƒƒã‚° - ã‚ã©ã‘ãªã„話
「純粋関数型言語ã¯ãƒ‡ãƒãƒƒã‚°ã—ã«ãã„。ã ã£ã¦ç´”粋ãªé–¢æ•°ã§ printf デãƒãƒƒã‚°ã§ããªã„ã‹ã‚‰ã€ã¨ã¤ã¶ã‚„ã„ã¦ã„る人をよã見ã‹ã‘ã¾ã™ã€‚ã“ã‚Œã¾ã§æ”¾ç½®ã—ã¦ãã¾ã—ãŸãŒã€ãƒªãƒ„イートãŒ50を超ãˆãŸã®ã§ã€Haskellã§ã®ãƒ‡ãƒãƒƒã‚°ã«ã¤ã„ã¦æ›¸ãã¾ã™ã€‚ 例外処ç†ã¨åŒã˜ã‚ˆã†ã«ã€Haskell ã§ã®ãƒ‡ãƒãƒƒã‚°ã§ã¯ã€ç´”粋ãªé–¢æ•°ã¨ IO を分ã‘ã¦è€ƒãˆã‚‹å¿…è¦ã‚ã‚Šã¾ã™ã€‚ IO ã§ã® printf デãƒãƒƒã‚° IO ã§ã¯ã€putStrLn ã‚„ print ãŒä½¿ãˆã‚‹ã‹ã‚‰å•é¡Œãªã„ã§ã™ã‚ˆã？ foo :: Int -> IO Bool foo i = do x <- ã‚ã‚Œã—㦠i putStrLn $ "x = " ++ show x ã“ã‚Œã—㦠putStrLn "ã“ã“も通éŽ" -- ãれもã™ã‚‹ y <- ãれもã™ã‚‹ print y return y ã¡ãªã¿ã«ã€forkIO èµ·å‹•ã—ãŸè»½é‡ã‚¹ãƒ¬ãƒƒãƒ‰ã‹ã‚‰ putStrLn ã™ã‚‹å ´åˆã€è»½é‡ã‚¹
関数プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®æ¥½ã—ã¿ - ã‚ã©ã‘ãªã„話
レビューã«å‚åŠ ã—ãŸã€Œé–¢æ•°ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®æ¥½ã—ã¿ã€ãŒå±Šãã¾ã—ãŸã€‚ã“ã‚Œã¯ã€é–¢æ•°ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®å…¥é–€æ›¸ã‚’ã„ãã¤ã‹èªã‚“ã 人ãŒã€ã‚‚ã£ã¨é«˜ã¿ã‚’目指ã™ãŸã‚ã®æœ¬ã§ã™ã€‚ 関数プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®æ¥½ã—㿠作者: Ｊｅｒｅï½ï½™ã€€ï¼§ï½‰ï½‚ｂï½ï½Žï½“　ï½ï½Žï½„　Ｏｅｇｅ　ｄｅ　ï¼ï½ï½ï½’,山下伸夫出版社/メーカー: オーム社発売日: 2010/06/23メディア: å˜è¡Œæœ¬ï¼ˆã‚½ãƒ•ãƒˆã‚«ãƒãƒ¼ï¼‰è³¼å…¥: 3人 クリック: 98回ã“ã®å•†å“ã‚’å«ã‚€ãƒ–ãƒã‚° (17件) を見る 目次 ã“ã®æœ¬ã¯ã€é–¢æ•°ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®çˆ¶ Richard Bird ãŒé‚„暦を迎ãˆã‚‹ã“ã¨ã‚’記念ã—ã¦ã€è‘—å人ãŒå„ç« ã‚’å¯„ç¨¿ã—ã€ç·¨é›†ã—ãŸæ§‹æˆã¨ãªã£ã¦ã„ã¾ã™ã€‚コードã¯ã™ã¹ã¦ Haskell ã§æ›¸ã‹ã‚Œã¦ã„ã¾ã™ã€‚目次ã¯ä»¥ä¸‹ã®é€šã‚Šã§ã™ã€‚ 二分ヒープ木ã®æ¥½ã—㿠仕様ã«åŸºã¥ãテスト -- QuickCheck を使ã£ã¦ ãŠã‚ŠãŒã¿ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚° Haskellã§éŸ³æ¥½ã‚’記述ã—解釈ã™ã‚‹ èžåˆå¤‰æ›ã‚’自
ã‚„ã•ã—ã„Functional reactive programming（Event編） - maoeã®ãƒ–ãƒã‚°
å‰å›žã¯FRPã®Behaviorã¨Eventã¨ã„ã†é‡è¦ãªæ¦‚念ã¨ã€Haskellã§ã®ä»£è¡¨çš„ãªãƒ©ã‚¤ãƒ–ラリを簡å˜ã«ç´¹ä»‹ã—ã¾ã—ãŸã€‚今回ã¯ç´¹ä»‹ã—ãŸã‚‚ã®ã®ä¸ã‹ã‚‰reactiveã¨ã„ã†ãƒ©ã‚¤ãƒ–ラリをå–り上ã’ã¾ã™ã€‚ ãªãŠã€reactiveã‚’ç†è§£ã™ã‚‹ã«ã‚ãŸã£ã¦Less Sugar/More Meat » Blog Archive » Introducing Reactive: Eventsã¨ã„ã†ãƒãƒ¥ãƒ¼ãƒˆãƒªã‚¢ãƒ«ãŒã¨ã¦ã‚‚å½¹ã«ç«‹ã£ãŸã“ã¨ã‚’書ã„ã¦ãŠãã¾ã™ã€‚ã“ã®å¾Œå‡ºã¦ãる解説も冒é 部分ã¯ã“ã®ãƒãƒ¥ãƒ¼ãƒˆãƒªã‚¢ãƒ«ã‹ã‚‰ã¨ã£ã¦ãã¦ã„ã¾ã™ã€‚ãã‚Œã¨ã€å‹•ä½œç’°å¢ƒã¯Linux上ã®GHC 6.12.1ã§ã‚³ãƒ³ãƒ‘イルã—ãŸreactive 0.11.4を使ã£ã¦ã„ã¾ã™ã€‚ reactiveã®ç‰¹å¾´ reactiveã¯Conal ElliottãŒä½œã£ãŸæœ€æ–°ã®FRPライブラリã§ã€ãƒ©ã‚¤ãƒ–ラリã®ãƒ¦ãƒ¼ã‚¶å´ã‹ã‚‰è¦‹ãŸå¤§ããªç‰¹å¾´ã¯ã€Arrowを使ã‚ãªã„å¤å…¸çš„FRPã‚’Fun
ã‚„ã•ã—ã„Functional reactive programming（概è¦ç·¨ï¼‰ - maoeã®ãƒ–ãƒã‚°
ã‚ã¨ã€ã‚„ã¯ã‚Šãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯å‘¨ã‚Šãªã©I/Oã®å¤šã„プãƒã‚°ãƒ©ãƒ ã®æ›¸ãã«ãã•ãŒèª²é¡Œã«ãªã£ã¦ã„ã‚‹å°è±¡ã€‚関数的ãªI/Oã¯FRPã§è§£æ±ºã§ããã†ãªæ°—ãŒã™ã‚‹ã‚“ã ã‘ã©èª¿ã¹ã¦ãªã„。ãã‚ãã‚FRPã‚’ã¡ã‚ƒã‚“ã¨ç†è§£ã—ãŸã„ãªãƒ¼ã€‚ Parsec 3活用事例: Keepalived構文ãƒã‚§ãƒƒã‚« - maoeã®ãƒ–ãƒã‚° ãªã‚“ã¦æ›¸ã„ã¦ã‹ã‚‰æ—©1ヶ月åŠã€ã‚ˆã†ã‚„ãFRPãŒæŽ´ã‚ã¦ããŸã®ã§ã‚ã‹ã£ãŸã“ã¨ã‚’ã¾ã¨ã‚ã¦ã¿ã¾ã™ã€‚ Reactive programmingã£ã¦ä½•ï¼Ÿ FRPã®å‰ã«ã€ä¸€èˆ¬çš„ã«wikipedia:en:Reactive programmingã¨å‘¼ã°ã‚Œã‚‹ãƒ‘ラダイムã«ã¤ã„ã¦è§¦ã‚Œã¦ãŠãã¾ã™ã€‚reactive programmingã¨ã¯ç–‘似言語を使ã£ã¦ã‹ãªãƒ¼ã‚Šå¤§é›‘把ã«èª¬æ˜Žã™ã‚‹ã¨ã€ var a = 1 var b = a + 1 a = 10 // aを書ãæ›ãˆã‚‹ print b // => 11print bã®å‡ºåŠ›ã¯2ã§ã¯ãªã11ã§ã™
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