Haskellã§ã® éŸ³æ¥½è¡¨ç¾ - Qiita
以å‰,Clojureã§éŸ³æ¥½çµ„織プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã«ã¤ã„ã¦æ›¸ã„ãŸã€‚ ãれを今度ã¯Haskellã§æ›¸ã“ã†ã¨æ€ã†ã€‚ Haskellã«ã‚ˆã‚‹éŸ³æ¥½æ§‹é€ プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã«ã¤ã„ã¦ã€‚ プãƒã‚°ãƒ©ãƒžãŒéŸ³æ¥½ã™ã‚‹ã“ã¨ã«ã¤ã„㦠音楽家ã§ãªã„人ãŒæ–°ã—ã„音楽を作るã“ã¨ã ã£ã¦ã‚ã‚‹ ç¾ä»£éŸ³æ¥½ã§ã¯æœ‰åãªãƒ¤ãƒ‹ã‚¹ クセナã‚スã¨ã„ã†äººãŒã„ã¾ã—ãŸã€‚å½¼ã¯éŸ³æ¥½å®¶ã‚’目指ã™ä»¥å‰ã¯ã€å»ºç¯‰å®¶ã§ã‚ã‚Šæ•°å¦ã«å ªèƒ½ãªäººã§ã—ãŸã€‚ãã—ã¦ã€éŸ³æ¥½å®¶ã‚’目指ã—ã€ãã—ã¦å‰å¤§ãªç¾ä»£éŸ³æ¥½å®¶ã‚ªãƒªãƒ´ã‚£ã‚¨ãƒ»ãƒ¡ã‚·ã‚¢ãƒ³ã«ã€å¸«äº‹ã—ã€å°‹ãã¾ã—ãŸã€‚ 音楽家ã«ãªã‚‹ãŸã‚ã«ã€ç§ã¯éŸ³æ¥½ã®ç†è«–ã‚’å¦ã³ãŸã„。何をå¦ã¶ã¹ãã§ã—ょã†ã‹? ãã—ã¦ã€ãƒ¡ã‚·ã‚¢ãƒ³ã¯è¨€ã„ã¾ã—ãŸã€‚ å›ã¯æ•°å¦ã‚’知ã£ã¦ã„る。ãªãœãれを作曲ã«å¿œç”¨ã—ãªã„ã®ã‹ã€‚ä¼çµ±çš„ãªä¿®ç·´ã¯ã€ã‚ã£ã¦ã‚‚ãªãã¦ã‚‚åŒã˜ã§ã¯ãªã„ã‹ ãã—ã¦ã€ã‚¯ã‚»ãƒŠã‚スã¯æ°—ã¥ãã¾ã—ãŸã€‚ãã—ã¦ã€éŸ³æ¥½ã®æ§‹ç¯‰ã«å½¼ã®æŒã¤æ•°å¦çš„ãªçŸ¥è˜ã€å»ºç¯‰ã®æ„Ÿè¦šã‚’音楽ã«å¿œç”¨ã—ã¦ã€æ–°ã—ã„音楽を作曲ã—ã¦ã„ãã¾ã™ã€‚大変ã™ã”ã„
A tutorial on the universality and expressiveness of fold (PDF)
J. Functional Programming 9 (4): 355–372, July 1999. Printed in the United Kingdom c ! 1999 Cambridge University Press 355 A tutorial on the universality and expressiveness of fold GRAHAM HUTTON University of Nottingham, Nottingham, UK http://www.cs.nott.ac.uk/-gmh Abstract In functional programming, fold is a standard operator that encapsulates a simple pattern of recursion for processing lists.
第25回　Haskellæµã®ä¾‹å¤–処ç†ã‚’å¦ã¶
Haskellã®é™çš„ãªåž‹æ¤œæŸ»ã¯å¼·åŠ›ã§ã™ãŒï¼Œãƒ—ãƒã‚°ãƒ©ãƒ ã®å®Ÿè¡Œæ™‚ã«èµ·ã“ã‚Šå¾—ã‚‹ã™ã¹ã¦ã®å•é¡Œã‚’解決ã§ãã‚‹ã‚ã‘ã§ã¯ã‚ã‚Šã¾ã›ã‚“。例ãˆã°ç¬¬5回ã§æŒ‡æ‘˜ã—ãŸã‚ˆã†ã«ï¼Œä¾å˜åž‹ã‚’æŒãŸãªã„ç¾åœ¨ã®æ¨™æº–Haskellã§ã¯ï¼Œæ¤œè¨¼ã§ãã‚‹å•é¡Œã®ç¯„囲ã«é™ç•ŒãŒã‚ã‚Šã¾ã™ã€‚ã¾ãŸï¼ŒFFIを使ã£ã¦å‘¼ã³å‡ºã™å¤–部関数ã«ã¯ï¼ŒHaskellã®åž‹æ¤œæŸ»ã¯è¡Œã届ãã¾ã›ã‚“。実行å‰ã«é™çš„ã«è§£æ±ºã§ããªã„å•é¡Œã¯ï¼Œå®Ÿè¡Œæ™‚ã«å‹•çš„ã«è§£æ±ºã™ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚ã“ã®ãŸã‚ã®æ‰‹æ®µã‚’æä¾›ã™ã‚‹ã®ãŒä¾‹å¤–処ç†ã§ã™ã€‚ 例外処ç†ã«ã¤ã„ã¦ã¯ï¼Œã“ã‚Œã¾ã§ä½•åº¦ã‹æ–片的ã«èª¬æ˜Žã—ã¾ã—ãŸãŒï¼Œå…¨ä½“åƒã‚’ã¾ã¨ã‚ã¦è§£èª¬ã—ãŸã“ã¨ã¯ã‚ã‚Šã¾ã›ã‚“ã§ã—ãŸã€‚次回以é™ã«FFIã¨ä¾‹å¤–処ç†ã¨ã®é–¢ä¿‚ã«ã¤ã„ã¦èª¬æ˜Žã™ã‚‹å‰ã«ï¼Œä»Šå›žã¯Haskellã®ä¾‹å¤–処ç†ã«ã¤ã„ã¦ãã¡ã‚“ã¨èª¬æ˜Žã—ã¦ãŠãã¾ã—ょã†ã€‚ 例外処ç†ã®ä»•çµ„ã¿ã¯ï¼ŒGHC 6.10ã«åŽéŒ²ã•ã‚Œã‚‹base 4.0パッケージ以é™ã§å¤§ãã変更ã•ã‚Œã¾ã™ã€‚baseパッケージã¯ãƒ‡ãƒ•ã‚¡ã‚¯ãƒˆãƒ»ã‚¹ã‚¿ãƒ³ãƒ€
Yale Computer Science has moved
Yale Computer Science has moved Please bookmark our new URL http://cpsc.yale.edu If you are not automatically redirected to the new site in a few seconds, please click on the link above.
Chapters - Learn You a Haskell for Great Good!
Introduction About this tutorial So what's Haskell? What you need to dive in Starting Out Ready, set, go! Baby's first functions An intro to lists Texas ranges I'm a list comprehension Tuples Types and Typeclasses Believe the type Type variables Typeclasses 101 Syntax in Functions Pattern matching Guards, guards! Where!? Let it be Case expressions Recursion Hello recursion! Maximum awesome A few m
モナドã£ã¦çµå±€ä½•ãªã®ã‚ˆ? — join to Monad v0.1 documentation
モナドã£ã¦çµå±€ä½•ãªã®ã‚ˆ?¶ Haskell を勉強ã—よã†ã¨ã™ã‚‹ã¨å¿…ãšã€Œãƒ¢ãƒŠãƒ‰ã€ã£ã¦ã®ãŒå‡ºã¦ãã¾ã™ã€‚å›°ã£ãŸã‚‚ã®ã§ã™ã€‚æ•°å¦ã¨ã‹åœè«–ã¨ã‹é–¢ä¿‚ãŒã‚るらã—ãã£ã¦ã€ä½•ãŒæ›¸ã„ã¦ã‚ã‚‹ã‚“ã ã‹åˆ†ã‹ã‚‰ãªãã£ã¦å«Œã«ãªã£ã¦ã—ã¾ã„ã¾ã™ã€‚ã§ã‚‚ãã€Haskell ã£ã¦å‡„ã„らã—ã„ã˜ã‚ƒãªã„ã§ã™ã‹ã€æ ¼å¥½è‰¯ã„らã—ã„ã˜ã‚ƒãªã„ã§ã™ã‹ã€‚ã“ã“ã¯ã¡ã‚‡ã£ã¨ãŒã‚“ã°ã£ã¦è‰²ã€…考ãˆã¦ã¿ã¾ã—ょã†ã€‚ ãã‚‚ãã‚‚ Haskell ã£ã¦ä½•ãªã®ã‚ˆ?¶ 何ãªã‚“ã§ã—ょã†ãã€Haskell ã£ã¦ã€‚コンピュータ言語らã—ã„ã‚“ã§ã™ã€ã‚ã€ãã‚Œã¯åˆ†ã‹ã£ã¦ã‚‹ã¨ã€‚良ã挙ã’られる性質ã¯æ¬¡ãªæ„Ÿã˜?: 関数型言語 å¼·ã„型付㑠é…延評価 å‚ç…§é€éŽ ã“ã“ã§ã¡ã‚‡ã£ã¨åž‹ã«é–¢ã—ã¦è¦‹ã¦ã¿ã¾ã—ょã†ã€‚試ã—ã« Haskell ã®å®Ÿè£…ã® 1 ã¤ã§ã‚ã‚‹ Hugs 㧠1 ã«ã¤ã„ã¦è€ƒãˆã¦ã¿ã¾ã™: $ hugs __ __ __ __ ____ ___ _____________________________
Make room for Functional Programming (1)
I’ve spilt this post into two so I can cover one concept from a couple of different angles. What I want to do first is explain the major elements of Functional Programming (FP) to those who, like me, might struggle with a lot of mathematical hoopla, Haskell and Lisp code, and second show by simple example where all this stuff is useful in the real world. Meaning I have struggled through the hoopla
純粋関数型雑記帳
TL;DR ç°¡æ½”ã§ç›´æ„Ÿçš„ã«æ‰±ãˆã‚‹ã€å®£è¨€çš„ãªRustå‘ã‘ã®ã‚³ãƒžãƒ³ãƒ‰ãƒ©ã‚¤ãƒ³å¼•æ•°ãƒ‘ーザーを作りã¾ã—ãŸã€‚ https://crates.io/crates/argopt モãƒãƒ™ãƒ¼ã‚·ãƒ§ãƒ³ Rustã«structoptã¨ã„ã†ãƒ©ã‚¤ãƒ–ラリãŒã‚ã‚Šã¾ã™ã€‚ã“ã‚Œã¯ã‚³ãƒžãƒ³ãƒ‰ãƒ©ã‚¤ãƒ³å¼•æ•°ã‚’パーズã™ã‚‹ãƒ©ã‚¤ãƒ–ラリãªã‚“ã§ã™ãŒã€åƒ•ã¯ã“ã®ãƒ©ã‚¤ãƒ–ラリãŒå¤§å¥½ããªã‚“ã§ã™ã€‚Rustã®ãƒ©ã‚¤ãƒ–ラリã®ä¸ã§ä¸€äºŒã‚’争ã†ã»ã©å¥½ãã§ã™ã€‚ãªã‚“ãªã‚‰ã‚³ãƒžãƒ³ãƒ‰ãƒ©ã‚¤ãƒ³ãƒ„ールをRustを書ãç†ç”±ã®å¤§éƒ¨åˆ†ãŒã“ã®ãƒ©ã‚¤ãƒ–ラリã®å˜åœ¨ã¨ã„ã£ã¦ã‚‚éŽè¨€ã§ã¯ãªã„ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“（éŽè¨€ã§ã™ã‘ã©ï¼‰ã€‚ ã—ã‹ã—structoptも使ã„続ã‘ã¦ã„ã‚‹ã¨ã€ã©ã†ã«ã‚‚ã‚‚ã£ã¨ä¾¿åˆ©ã«ã§ãã‚‹ã‚“ã˜ã‚ƒãªã„ã®ã‹ã¨æ€ã†éƒ¨åˆ†ãŒå‡ºã¦ãã¾ã™ã€‚structoptã§ã¯åå‰ã®é€šã‚Šã‚³ãƒžãƒ³ãƒ‰ãƒ©ã‚¤ãƒ³å¼•æ•°ã‚’structã§å®šç¾©ã—ã¦ã€ãã‚Œã«#[derive(StructOpt)] ã¨StructOptã‚’deriveã™ã‚‹ã“ã¨ã§ãƒ‘ーザーã®ã‚³
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Developing Web Applications with Haskell and Yesod
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