ã¯ã¦ãªãƒ–ックマーク in Scala2015-08-01 Scala関西 Summit 2015 発表資料 (関係モナドã«ã¤ã„ã¦ç™ºè¡¨å¾Œã«å…¬é–‹ã—ãŸã‚³ãƒ¼ãƒ‰ãªã©ã¸ã®ãƒªãƒ³ã‚¯ã®ã‚¹ãƒ©ã‚¤ãƒ‰ã‚’è¿½åŠ )
My Vim setup for Scala | bleibinha.us/blog
In this post, I give an overview of my current Vim [1] setup. I use Vim as my main editor for text files, among them also code and especially Scala [2] code. The post introduces the Vim plugins I use, my .vimrc configuration file and shows a way to combine Vim with Eclipse [3] using Eclim [4] . This post had a major update in January 2014. It has inspired a vim-scala-setup [5] project available on
Coding Scala with Vim
There are Vim users and there are Scala coders and, occassionally those two wonderful things happen to get mixed up into the same person. I'm one of those people, and have finally gotten around to sharing how I code Scala with Vim in a screencast. Watch it on Vimeo using this link, or just watch it below. The Workflow This is exceedingly simple; it involves only two GUI elements: Vim and a termina
The Dark Side of Scala
val is better than Java's final? JavaScript hoisting var r = double(1) + triple(1); function double(x) {return x * 2;} var triple = function(x) {return x * 3;} Throws: java.lang.NullPointerException at Vals.<init>(Vals.scala:2) Simplified class Vals { println(answer) private[this] val answer = 42 } Prints... 0 return in lambda def samples(xs: TraversableOnce[Int]) { xs map {x => return x * 10} for
Log4J徹底解説～使ã„æ–¹(logback)
ã“ã®ãƒšãƒ¼ã‚¸ã§ã¯ã€å¤§ä½“ 使ã„方（1,2)ã§ã‚„ã£ãŸã®ã«æº–ã˜ã¦ã€Logback ã®ä½¿ã„方を解説ã™ã‚‹ã€‚ 目次 Logback ã®å‘¼ã³æ–¹ã€ã¨ã„ã†ã‹ slf4j 解説 slf4jã®ãƒã‚¬ãƒ¼å®Ÿè£…切替ãˆãƒ¡ã‚«ãƒ‹ã‚ºãƒ logback.xml ãƒã‚°å‡ºåŠ› レイアウト Logback ã®å‘¼ã³æ–¹ã€ã¨ã„ã†ã‹ slf4j 解説 ã¾ã‚ã€æŠ½è±¡è«–よりもã€å…·ä½“çš„ãªã‚³ãƒ¼ãƒ‰ã‚’見よã†ã˜ã‚ƒãªã„ã‹ã€‚サンプルコードã¯ã“ã‚“ãªã‚‚ã®ã 。 import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class Test { protected static Logger log = LoggerFactory.getLogger( TestLogback.class ); public static void main( String [] args ) { new SimpleTe
Reflectionã§åž‹æƒ…å ±ã‚’å–å¾— | Scala Cookbook
Scalaã§ã¯Reflectionを使ã†ã¨ã‚ˆã‚Šè©³ç´°ãªåž‹æƒ…å ±ã‚’å–å¾—ã™ã‚‹ã“ã¨ãŒã§ãã¾ã™ã€‚ ã‚¯ãƒ©ã‚¹æƒ…å ±ã‚’å–å¾— (Scala2.10以å‰) Scala2.10以å‰ã§ã¯ã€ä»¥ä¸‹ã®ã‚ˆã†ã«åž‹æƒ…å ±ã‚’å–å¾—ã§ãã¾ã™ã€‚ case class Person(id:Int, name:String, age:Option[Int]) val c = classOf[Person] // Class[Person]ã‚’å–å¾— c.getSimpleName // Person c.getName // Personクラスã®ãƒ‘ッケージåã‚’å«ã‚€full path ã—ã‹ã—ã€Personクラスã«ã©ã®ã‚ˆã†ãªåž‹ã®å¤‰æ•°ãŒå®šç¾©ã•ã‚Œã¦ã„るを知りãŸã„å ´åˆã€ javaã®Reflection機能を使ã†ã€‚Class.getDeclaredFields/Methodsãªã© javapã‚„ASMãªã©ã§ã‚³ãƒ³ãƒ‘イル後ã®ãƒã‚¤ãƒˆã‚³ãƒ¼ãƒ‰ã‚’直接å‚ç…§ ScalaSig
「Scalaを使ã„始ã‚ã¦ã‹ã‚‰åŠå¹´ã ã‘ã©å°è±¡ã‚’ã¾ã¨ã‚ã¦ã¿ã‚‹ã€ã¸ã®ã‚³ãƒ¡ãƒ³ãƒˆ
kmizu @kmizu 率直ãªå°è±¡ã¨ã—ã¦èˆˆå‘³æ·±ã„ã®ã§ã€è‡ªåˆ†ã®è¦‹è§£ã‚’ã“ã£ã‹ã‚‰ã¡ã‚‡ã£ã¨æ›¸ã„ã¦ã¿ã‚‹ã€‚ #scalajp #scala_impression "Scalaを使ã„始ã‚ã¦ã‹ã‚‰åŠå¹´ã ã‘ã©å°è±¡ã‚’ã¾ã¨ã‚ã¦ã¿ã‚‹ - ã½ã«ãã™ã˜ã‚ƒãªã„ブãƒã‚° http://t.co/K4ojux3naK" 2013-12-20 12:42:53 kmizu @kmizu ã¨ã‚Šã‚ãˆãšã€æœ€åˆã«æ–ã£ã¦ãŠãã¨ã€ @erukiti ã•ã‚“(id:erukitiã•ã‚“)ã«ã¯æ‚ªå°è±¡ã¯æŒã£ã¦ã„ã¾ã›ã‚“。Scalaを始ã‚ã¦ã‹ã‚‰ã®çŽ‡ç›´ãªå°è±¡ãŒæ›¸ã‹ã‚Œã¦ã„ã‚‹ãªã¨ç´ ç›´ã«æ€ã„ã¾ã™ã€‚ #scala_impression 2013-12-20 12:46:24
Scalaを使ã„始ã‚ã¦ã‹ã‚‰åŠå¹´ã ã‘ã©å°è±¡ã‚’ã¾ã¨ã‚ã¦ã¿ã‚‹ - ã½ã«ãã™ã˜ã‚ƒãªã„ブãƒã‚°
2013-12-19 Scalaを使ã„始ã‚ã¦ã‹ã‚‰åŠå¹´ã ã‘ã©å°è±¡ã‚’ã¾ã¨ã‚ã¦ã¿ã‚‹ Scala 僕ã¯Scalaを使ã„始ã‚ã¦ã ã„ãŸã„åŠå¹´ã¨ã„ã†ã¨ã“ã‚ã§ã™ã€‚æ¥å‹™ã§ä½¿ã£ã¦ã‚‹ã‚“ã§ã™ãŒã€æœ€è¿‘ã«ãªã£ã¦ã‚„ã£ã¨æ¥½ã—ã•ãŒå°‘ã—ã‚ã‹ã‚Šå§‹ã‚ãŸã¨ã“ã‚ã§å°è±¡ã‚’ã¾ã¨ã‚ã¦ã¿ã¾ã—ãŸã€‚主観性ãŒé«˜ã„ã®ã§ç•°è«–ï½¥åè«–ã®ã‚る人も多ã„ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“ 覚ãˆã‚‹ã“ã¨ãŒå¤šã„ ※個人差ãŒã‚ã‚Šã¾ã™ Scala ã¯æ§˜ã€…ãªæ–‡åŒ–ã®ã”ã£ãŸç…®ãªã¨ã“ã‚ãŒã‚ã‚‹ãŸã‚ã€æ§˜ã€…ãªæ–‡åŒ–を知ã£ã¦ãªã„ã¨ãƒ„ライã§ã™ã€‚よã better Java ã¨ã—ã¦ç°¡å˜ã«ä½¿ãˆã‚‹ã‚ˆã¨ã„ã†ç”˜è¨€ã‚’ã•ã•ã‚„ã人ãŒã„ã¾ã™ãŒã€better Java ã¨ã—ã¦ä½¿ã†ã«ã¯ãã‚‚ãã‚‚ Java ã®çŸ¥è˜ãŒå¿…è¦ãªã‚ã‘ã§ã™ã—ã€better Java ãªã‚³ãƒ¼ãƒ‰ã‚’書ã„ã¦ã‚‹ã¨ã€ã€Œvarやミュータブルコレクション使ã£ã¦ã„ã„ã®ã¯å°å¦ç”Ÿã¾ã§ã よãã€ã¨ã‹ã€Œwhileæ–‡ãªã‚“ã¦æ™®é€šä½¿ã‚ãªã„ã€ã¨ã‹ã€ŒEnumerationã˜ã‚ƒãªãã¦ä»£æ•°åž‹ãƒ‡ãƒ¼ã‚¿æ§‹é€
Sprayã®ç°¡å˜ãªç´¹ä»‹ - アドファイブ日記（ミラー版）
Scala Advent Calendar 2013ã®10日目担当記事ã§ã™ã€‚ã¿ã‚“ãªã‚¬ãƒãªäººã°ã‹ã‚Šã§æ€–ã„ã§ã™ã€‚ã‚ã¾ã‚ŠæœŸå¾…ã—ãªã„ã§ãã ã•ã„。 ã‚°ã‚°ã£ã¦ã‚‚日本ã®è¨˜äº‹ãŒã‚ã¾ã‚Šãªã„Sprayã®ç´¹ä»‹ã‚’ã—ã¦ã¿ã¾ã™ã€‚ ã‚ã¨è¡¨é¡Œã¨é–¢ä¿‚ãªã„ã§ã™ãŒæœ€è¿‘書ã„ãŸPlayFrameworkã«Slickã‚„SecureSocialを入れãŸãƒ¡ãƒ¢ã‚’掲載ã—ã¦ãŠãã¾ã™ã€‚ Play2.2ã¸ã®Slickã®ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ« Play2ã®èªè¨¼ãƒ©ã‚¤ãƒ–ラリSecuaSocialを使ㆠSprayã«ã¤ã„㦠Akkaをベースã«éžåŒæœŸãƒ¢ãƒ‡ãƒ«ã§å®Ÿè£…ã•ã‚ŒãŸè¶…ãƒã‚¤ãƒ‘フォーマンスãªHTTP処ç†ãƒ•ãƒ¬ãƒ¼ãƒ ワークã¨ã„ã†æ„Ÿã˜ã®ã‚‚ã®ã€‚型システムãŒã‚ã£ã¦éžåŒæœŸã§ãƒžãƒ«ãƒã‚¹ãƒ¬ãƒƒãƒ‰ï¼ˆã‚¢ã‚¯ã‚¿ãƒ¼ï¼‰å¯¾å¿œã—ã¦ã¦ãƒ—ラグインãŒã‚る程度æƒã£ã¦ã‚‹HTTPサーãƒã‚„Webフレームワークã£ã¦Scalaã«ã—ã°ã‚‰ãªãã¦ã‚‚å°‘ãªãã†ã§ã™ã€‚ãƒã‚¤ãƒ•ãƒªãƒ¼ã‚¯ã‚¨ãƒ³ã‚·â€•ãªWebアプリケーションやREST-APIを作る
Scalaã§åž‹ã‚¯ãƒ©ã‚¹å…¥é–€ - still deeper
型クラスã«ã¤ã„ã¦ã¤ã‚‰ã¤ã‚‰è€ƒãˆã¦ã„ãŸã“ã¨ã‚’ã¾ã¨ã‚ã¦ãŠãã¾ã™ã€‚マサカリæ“迎。 型クラスã£ã¦ï¼Ÿ 型クラスã¨ã¯ä¸€è¨€ã§ã„ã†ã¨ã€‚ アドホック多相 を実ç¾ã™ã‚‹ã‚‚ã® ã§ã™ã€‚モã‹ã‚‰å§‹ã¾ã‚‹å状ã—難ã„ã‚ã‚Œã¨ã¯ç›´æŽ¥ã¯é–¢ä¿‚ã‚ã‚Šã¾ã›ã‚“。 ã§ã¯ã‚¢ãƒ‰ãƒ›ãƒƒã‚¯å¤šç›¸ã¨ã¯ä½•ã‹ã¨ã„ã†ã¨ ç•°ãªã‚‹åž‹ã®é–“ã§å…±é€šã—ãŸã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ã§ã®ç•°ãªã‚‹æŒ¯ã‚‹èˆžã„ã‚’ 定義済ã¿ã®åž‹ã«å¯¾ã—ã¦æ‹¡å¼µã™ã‚‹ よã†ãªå¤šç›¸ã®ã“ã¨ã§ã™ã€‚ ç•°ãªã‚‹åž‹é–“ã§ã®å…±é€šã—ãŸã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ã§ã®ç•°ãªã‚‹æŒ¯ã‚‹èˆžã„ Javaã®ç¶™æ‰¿ã‚„インターフェースã€Scalaã®traitを用ã„ã‚‹ã“ã¨ã§ã€ç•°ãªã‚‹åž‹é–“ã§ã®å…±é€šã—ãŸã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ã‚’管ç†ã™ã‚‹ã“ã¨ãŒã§ãã¾ã™ã€‚ trait SomeTrait { def someMethod(): String } class Foo extends SomeTrait { def someMethod(): String = "foo" } class Bar ex
Scala partial functions (without a PhD)
The first time I saw this kind of things I was a bit puzzled: in which situations could case be used without match? Well, it turns out 1 that a block with a bunch of case inside is one way of defining an anonymous function. There is nothing new with anonymous functions of course, and Scala has a very compact notation for those that doesn’t involve case. But this particular way of defining anonymou
Scalaã®PartialFunctionãŒä¾¿åˆ©ã§ã™ã‚ˆ - ( ꒪⌓꒪) ゆるよã‚日記
Scalaã«ã¯ã€PartialFunctionã¨ã„ã†ã‚‚ã®ãŒã‚ã‚Šã¾ã™ã€‚ 直訳ã™ã‚‹ã¨éƒ¨åˆ†é–¢æ•°ã§ã™ãŒã€ã“ã‚Œã¯ãªã«ã‹ã£ã¦ã„ã†ã¨ã€Œç‰¹å®šã®å¼•æ•°ã«å¯¾ã—ã¦ã¯çµæžœã‚’è¿”ã™ã‘ã©ã€çµæžœã‚’è¿”ã›ãªã„引数もã‚るよã†ãªä¸é€”åŠç«¯ãªé–¢æ•°ã€ã§ã™ã€‚ ã©ã†ã‚„ã£ã¦ä½¿ã†ã®ã‚“? ã¾ãã€ã¡ã‚‡ã£ã¨ä¾‹ã‚’見ã¦ã¾ã—ょã†ã‚„。PartialFunctionã§ã‚ã‚‹fooPfã¯ã€å¼•æ•°ãŒ"foo"ã ã£ãŸã‚‰"bar"ã‚’è¿”ã—ã¦ã€"foo"以外ã¯çŸ¥ã‚‰ã‚“ã¨ã„ã†ã¦ãã¨ãƒ¼ãªé–¢æ•°ã§ã™ã€‚ scala> val fooPf:PartialFunction[String,String] = { case "foo" => "bar" } fooPf: PartialFunction[String,String] = <function1> scala> fooPf("foo") res5: String = bar scala> fooPf("hoge") scala.Mat
Hadoop/Storm ã®çµ±åˆã‚’実ç¾ã™ã‚‹ Twitter ã® SummingBird - Okapies' Archive
Twitter ㌠SummingBird ã‚’æ£å¼ãƒªãƒªãƒ¼ã‚¹ã—ã¦æ—©äºŒãƒ¶æœˆã€‚「日本語ã®ç´¹ä»‹è¨˜äº‹ãŒã»ã¨ã‚“ã©å‡ºã¦ãªã„ãªã€ã¨æ°—付ã„ãŸã®ã§ã€èª¿æŸ»ãŒã¦ã‚‰ã¾ã¨ã‚ã¦ã¿ã¾ã—ãŸã€‚ SummingBird ã¨ã¯ï¼Ÿ MapReduce ãªãƒ—ãƒã‚°ãƒ©ãƒ を書ããŸã‚ã® Scala/Java ライブラリ。最大ã®ç‰¹å¾´ã¯ã€ã²ã¨ãŸã³ SummingBird ã§æ›¸ã„ãŸã‚¸ãƒ§ãƒ–㯠Hadoop ã§ã‚‚ Storm ã§ã‚‚åŒã˜ã‚ˆã†ã«å®Ÿè¡Œã§ãã‚‹ã“ã¨ã€‚ SummingBird ã§ã¯ã€Hadoop を使ã†ã€Œãƒãƒƒãƒãƒ¢ãƒ¼ãƒ‰ã€ã¨ã€Storm を使ã†ã€Œãƒªã‚¢ãƒ«ã‚¿ã‚¤ãƒ モードã€ã«åŠ ãˆã¦ã€äºŒã¤ã‚’åŒæ™‚ã«å®Ÿè¡Œã™ã‚‹ã€Œãƒã‚¤ãƒ–リッドモードã€ãŒã‚る。ãƒã‚¤ãƒ–リッドモードã§ã¯ã€ã‚¸ãƒ§ãƒ–ã®ä½œè€…ãŒç‰¹ã«é…æ…®ã—ãªãã¦ã‚‚ã€ãƒãƒƒãƒã¨ãƒªã‚¢ãƒ«ã‚¿ã‚¤ãƒ ã®å‡¦ç†çµæžœã‚’自動的ã«ãƒžãƒ¼ã‚¸ã§ãる。 ãƒã‚¤ãƒ–リッドモードã§ã¯ã€åŒã˜ã‚¸ãƒ§ãƒ–ã‚’ Hadoop 㨠Storm ã§åŒæ™‚ã«å®Ÿè¡Œã§ãã‚‹ã®ã§ã€Hadoop ã®è€éšœå®³æ€§
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[Japanese] Skinny Framework ã§å§‹ã‚ã‚‹ Scala #jjug_ccc #ccc_r24![[Japanese] Skinny Framework ã§å§‹ã‚ã‚‹ Scala #jjug_ccc #ccc_r24](https://cdn-ak-scissors.b.st-hatena.com/image/square/4669f5549d4f88f36be68b2081573352794a87e6/backend=imagemagick;height=288;version=1;width=512/https%3A%2F%2Fcdn.slidesharecdn.com%2Fss_thumbnails%2Fjjugccc2014spring-140518040446-phpapp02-thumbnail.jpg%3Fwidth%3D640%26height%3D640%26fit%3Dbounds)
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Scala object private scope with inner classes and methods
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