[B! Scala] pokutunaã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

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Scalaã«é–¢ã™ã‚‹pokutunaã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (229)

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Scala macrosä¸ç´šè€…ã®å£: symbolã¨owner - Qiita
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pokutuna 2017/02/06
Scala
ãƒªãƒ³ã‚¯
Scala's either with tuple as Right
pokutuna 2016/08/19
Scala
ãƒªãƒ³ã‚¯
sbt on Twitter: "@ottu sorry, sbt stands for é…¢è±š."
@ottu sorry, sbt stands for é…¢è±š.
pokutuna 2016/08/05
Scala
ãƒªãƒ³ã‚¯
What does the `#` operator mean in Scala?
I see this code in this blog: Type-Level Programming in Scala: // define the abstract types and bounds trait Recurse { type Next <: Recurse // this is the recursive function definition type X[R <: Recurse] <: Int } // implementation trait RecurseA extends Recurse { type Next = RecurseA // this is the implementation type X[R <: Recurse] = R#X[R#Next] } object Recurse { // infinite loop type C = Rec
pokutuna 2016/04/12
Scala
ãƒªãƒ³ã‚¯
ã€Œãƒ¢ãƒŠãƒ‰ã¯è±¡ã (Monads are Elephants)ã€æ—¥æœ¬èªžè¨³ â€” Japanese Translation of Monads are Elephants v1.0 documentation
ã€Œãƒ¢ãƒŠãƒ‰ã¯è±¡ã (Monads are Elephants)ã€æ—¥æœ¬èªžè¨³Â¶ ã“ã®æ–‡ç« ã¯ã€ä»¥ä¸‹ã®è¨˜äº‹ã®ç¿»è¨³ã§ã™ã€‚ Monads are Elephants: http://james-iry.blogspot.com/2007/09/monads-are-elephants-part-1.html http://james-iry.blogspot.com/2007/10/monads-are-elephants-part-2.html http://james-iry.blogspot.com/2007/10/monads-are-elephants-part-3.html http://james-iry.blogspot.com/2007/11/monads-are-elephants-part-4.html JAMES IRY:ONE DIV ZERO: http://james-iry
pokutuna 2016/04/12
Scala

Functional
ãƒªãƒ³ã‚¯
æ€§èƒ½ç‰¹æ€§
ã“ã‚Œã¾ã§ã®èª¬æ˜Žã§ç•°ãªã‚‹ã‚³ãƒ¬ã‚¯ã‚·ãƒ§ãƒ³ãŒç•°ãªã‚‹æ€§èƒ½ç‰¹æ€§ (performance characteristics) ã‚’æŒã¤ã“ã¨ãŒåˆ†ã‹ã£ãŸã€‚æ€§èƒ½ç‰¹æ€§ã¯ã‚³ãƒ¬ã‚¯ã‚·ãƒ§ãƒ³åž‹ã‚’æ¯”è¼ƒã™ã‚‹ç¬¬ä¸€ã®åŸºæº–ã¨ã—ã¦ã‚ˆãä½¿ã‚ã‚Œã‚‹ã€‚ä»¥ä¸‹ã® 2ã¤ã®è¡¨ã«ã‚³ãƒ¬ã‚¯ã‚·ãƒ§ãƒ³ã®ä¸»ãªæ¼”ç®—ã®æ€§èƒ½ç‰¹æ€§ã‚’ã¾ã¨ã‚ãŸã€‚ åˆ—åž‹ã®æ€§èƒ½ç‰¹æ€§: head tail apply æ›´æ–° å…ˆé ã«è¿½åŠ æœ€å¾Œã«è¿½åŠ æŒ¿å…¥
pokutuna 2016/04/12
Scala
ãƒªãƒ³ã‚¯
Scaladoc â€” Scala Style Guide v1.2.5 documentation
ScaladocÂ¶ å…¨ã¦ã®ãƒ‘ãƒƒã‚±ãƒ¼ã‚¸ï¼Œã‚¯ãƒ©ã‚¹ï¼Œãƒˆãƒ¬ã‚¤ãƒˆï¼Œãƒ¡ã‚½ãƒƒãƒ‰ï¼Œãã®ä»–ã®ãƒ¡ãƒ³ãƒã«ãƒ‰ã‚ãƒ¥ãƒ¡ãƒ³ãƒˆã‚’æä¾›ã™ã‚‹ã“ã¨ã¯ã¨ã¦ã‚‚é‡è¦ã§ã™ã€‚Scaladocã¯ä¸€èˆ¬ã«Javadocã®æ…£ç¿’ã«å¾“ã„ã¾ã™ãŒï¼Œè¨˜è¿°ã‚’ç°¡æ½”ã«ã™ã¾ã›ã‚‹ãŸã‚ã®æ©Ÿèƒ½ãŒå¤šæ•°è¿½åŠ ã•ã‚Œã¦ã„ã¾ã™ã€‚ æ™®é€šã¯ï¼Œæ›¸å¼ã‚ˆã‚Šã‚‚ãã®å†…å®¹ã‚„æ›¸ãæ–¹ã‚’æ°—ã«ã—ãŸã„ã¨æ€ã„ã¾ã™ã€‚Scaladocã¯çµŒé¨“è±Šå¯Œãªãƒ¦ãƒ¼ã‚¶ã¨åŒæ§˜ã«åˆå¿ƒè€…ã«ã‚‚ä¾¿åˆ©ã§ç„¡ãã¦ã¯ãªã‚Šã¾ã›ã‚“ã€‚ã“ã®ç›®çš„ã‚’é”æˆã™ã‚‹æ–¹æ³•ã¯ã¨ã¦ã‚‚å˜ç´”ã§ã™ã€‚ã™ãªã‚ã¡ï¼Œèª¬æ˜Žã®è©³ç´°åº¦ã‚’ä¸Šã’ã¦ï¼Œç°¡æ˜Žãªè¦ç´„ã‹ã‚‰å§‹ã‚ï¼ˆç†Ÿé”ã—ãŸãƒ¦ãƒ¼ã‚¶ã®å‚è€ƒã¨ã—ã¦æœ‰ç›Šã§ã™ï¼‰ï¼Œè©³ç´°éƒ¨ã§ã¯ã‚ˆã‚Šä¸å¯§ãªä¾‹ï¼ˆç†Ÿç·´è€…ã¯ç„¡è¦–ã™ã‚‹ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“ãŒï¼Œåˆå¿ƒè€…ã«ã¯ä½•ã‚ˆã‚Šã‚‚è²´é‡ãªã‚‚ã®ã§ã™ï¼‰ã‚’æä¾›ã™ã‚‹ã“ã¨ã§ã™ã€‚ Scaladocã®ä¸€èˆ¬çš„ãªæ›¸å¼ã¯æ¬¡ã®æ§˜ãªã‚‚ã®ã§ã™ã€‚ /** * ã“ã‚Œã¯ä½•ã‚’èª¬æ˜Žã—ã‚ˆã†ã¨ã—ã¦ã„ã‚‹ã‹ã®ç°¡æ½”ãªè¨˜è¿°ã§ã™ã€‚ * * ã“ã‚Œã¯æˆ‘ã€…ãŒãƒ‰ã‚ãƒ¥ãƒ¡ãƒ³ãƒˆåŒ–ã—ã‚ˆã†ã¨ã—ã¦ã„ã‚‹ã‚‚ã®ã‚’æ›´ã«è¨˜è¿°
pokutuna 2016/04/11
Scala
ãƒªãƒ³ã‚¯
dotfiles/init.el at master Â· fommil/dotfiles Â· GitHub
pokutuna 2016/04/07
Scala

Emacs
ãƒªãƒ³ã‚¯
Scala 2.10.0 Try ï¼† NonFatal - CLOVERðŸ€
ãªã‚“ã‹ã€æƒ…å ±ã ã‘ãƒãƒ©ãƒãƒ©è¦‹ã‹ã‘ã¦ã„ã¦æ°—ã«ãªã£ã¦ã„ãŸã®ã§ã€‚ã¾ã‚ã€åŠåˆ†ãã‚‰ã„Futureã®æ™‚ã«ä½¿ã£ã¦ã„ã‚‹ã®ã§ã™ãŒã€‚ Try Futureã®çµæžœã¨ã—ã¦ä½¿ã£ã¦ã„ãŸã€Successã¨Failureã®è¦ªã‚¯ãƒ©ã‚¹ã§ã™ã€‚SuccessãŒæˆåŠŸã€FailureãŒå¤±æ•—ã‚’è¡¨ã™ã‚ã‘ã§ã™ãŒã€Failureã¯ä¾‹å¤–ã‚’æƒ…å ±ã¨ã—ã¦æŒã¡ã¾ã™ã€‚ãã‚Œä»¥å¤–ã¯Successã§ã™ã¨ã€‚ Futureã®æ™‚ã¯ã€è¨ˆç®—çµæžœãŒSuccessã¾ãŸã¯Failureã¨ã—ã¦å¾—ã‚‰ã‚Œã¾ã—ãŸãŒã€ã“ã‚Œã‚’å˜ç‹¬ã§ä½¿ã†å ´åˆã«ã¯Tryã‚³ãƒ³ãƒ‘ãƒ‹ã‚ªãƒ³ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã®applyãƒ¡ã‚½ãƒƒãƒ‰ã‚’ä½¿ç”¨ã—ã¾ã™ã€‚ println(Try { 10 }) // => Success(10) println(Try { throw new Exception("Oops!") }) // => Failure(java.lang.Exception: Oops!) Try.applyã®ã‚·ã‚°ãƒãƒãƒ£ã¯
pokutuna 2016/04/05
Scala
ãƒªãƒ³ã‚¯
scala/src/library/scala/util/control/NonFatal.scala at v2.11.8 Â· scala/scala
pokutuna 2016/04/05
Scala
ãƒªãƒ³ã‚¯
GitHub - nscala-time/nscala-time: A new Scala wrapper for Joda Time based on scala-time
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pokutuna 2016/04/01
Scala
ãƒªãƒ³ã‚¯
ç«¹æ·»ã•ã‚“ãŒç´¹ä»‹ã—ã¦ãªã„Scalaã®Webãƒ•ãƒ¬ãƒ¼ãƒ ãƒ¯ãƒ¼ã‚¯ã‚‚å«ã‚ã¦2015å¹´ç¾åœ¨ã®çŠ¶æ³ã‚’è‰²ã€…ç´¹ä»‹ - xuwei-k's blog
Scalaã®Webãƒ•ãƒ¬ãƒ¼ãƒ ãƒ¯ãƒ¼ã‚¯äº‹æƒ… 2015å¹´ç‰ˆ - ãŸã‘ãžã†ç€•æ»ãƒ–ãƒã‚° Scalaç•Œéšˆã®Webãƒ•ãƒ¬ãƒ¼ãƒ ãƒ¯ãƒ¼ã‚¯ã‚„Jsonãƒ©ã‚¤ãƒ–ãƒ©ãƒªã¯è‰¯ãã‚‚æ‚ªãã‚‚æ··æ²Œã‚’æ¥µã‚ã¦ã„ã‚‹(?)ã‚ã‘ã§ã™ãŒã€ãã‚Œã«ã—ã¦ã‚‚ç«¹æ·»ã•ã‚“ãŒç´¹ä»‹ã—ã¦ã‚‹ã‚„ã¤ã ã‘ã§ã¯å€‹äººçš„ã«ä¸å…¬å¹³æ„Ÿã¨ã„ã†ã‹ã€æ··æ²Œã¨ã—ã¦ã„ã‚‹æ„ŸãŒå…¨ç„¶ä¼ã‚ã‚‰ãªã„ã¨æ€ã£ãŸã®ã§ã€å…¨éƒ¨ã«è©³ã—ã„è¨³ã§ã¯ã„ã§ã™ãŒã€è‡ªåˆ†ãªã‚Šã«ç¾çŠ¶ã‚’æ›¸ããŸããªã£ãŸã®ã§ç´¹ä»‹ã—ã‚ˆã†ã¨æ€ã„ã¾ã™ã€‚ ã©ã†ã›å…¨éƒ¨ã‚’æœ¬å½“ã«çŸ¥ã‚Šå°½ãã—ã¦ã„ã‚‹äººãªã‚“ã§ã„ãªã„ã®ã§ã€ã“ã‚Œã¯ã“ã‚Œã§ä¸å…¬å¹³ã¨ã„ã†ã‹åã£ãŸè¦‹æ–¹ã«ã‚‚ãªã£ã¦ã‚‹ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“ãŒã€ãã‚“ãªã“ã¨è¨€ã£ã¦ãŸã‚‰ã“ã†ã„ã†è¨˜äº‹ã‚’ã„ã¤ã¾ã§çµŒã£ã¦ã‚‚æ›¸ã‘ãªã„ã®ã§ã€æ€ã„åˆ‡ã£ã¦æ›¸ãã“ã¨ã«ã—ã¾ã—ãŸã€‚ ã„ã¤ã‚‚ã®æ³¨æ„æ›¸ãã§ã™ãŒã€ã‚ãã¾ã§ã“ã‚Œæ›¸ã„ã¦ã‚‹2015å¹´10æœˆç¾åœ¨ã®çŠ¶æ³ã§ã‚ã‚Šã€1å¹´ç¨‹åº¦çµŒéŽã—ãŸã ã‘ã§çŠ¶æ³ã¯åŠ‡çš„ã«å¤‰åŒ–ã™ã‚‹å¯èƒ½æ€§ã‚ã‚‹ã®ã§ã€ã”äº†æ‰¿ãã ã•ã„ã€‚ ãã‚‚ãã‚‚ã€ã‚ã¾ã‚Šã“ã†ã„ã†ã®æ›¸ããŸããªã„ã®ã¯ã€ã‚ã‚Š
pokutuna 2016/04/01
Scala
ãƒªãƒ³ã‚¯
Cake Pattern ã‚’ç†è§£ã™ã‚‹ - daimatz.net -
Posted on 2014-01-28 tags: scala, oop ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆæŒ‡å‘ã¨ãƒ†ã‚¹ãƒˆã«ã¤ã„ã¦ ç§ã¯ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆæŒ‡å‘ã‚„ç‰¹ã«è‡ªå‹•ãƒ†ã‚¹ãƒˆå‘¨ã‚Šã®å®Ÿå‹™çµŒé¨“ã«ä¹ã—ã„ã‚ã‘ã§ã™ãŒã€æœ€è¿‘ã«ãªã£ã¦ã‚ˆã†ã‚„ããƒ†ã‚¹ãƒˆã‚’ãã¡ã‚“ã¨æ›¸ã„ãŸã‚Šãƒ†ã‚¹ãƒˆãƒ•ã‚¡ãƒ¼ã‚¹ãƒˆã«ã‚ˆã£ã¦è‰¯ã„è¨è¨ˆã«ãªã‚‹ã¿ãŸã„ãªå®Ÿæ„Ÿã‚’å¾—ãŸã‚Šã—ã¦ã„ã¾ã™ã€‚é•·ã‚‰ããƒ†ã‚¹ãƒˆã‚’æ›¸ã‹ãªã„æ–‡åŒ–ã«ã„ãŸã®ã§ã€æ³¨æ„ã—ãªã„ã¨ã™ãã«ãƒ¢ãƒŽãƒªã‚·ãƒƒã‚¯ãªè¨è¨ˆã«ãªã£ã¦ã—ã¾ã„ã€å¾Œã‹ã‚‰ã€Œãƒ†ã‚¹ãƒˆæ›¸ãã®ã©ã†ã™ã‚“ã ã“ã‚Œã€ã¿ãŸã„ã«ãªã£ã¦ã—ã¾ã†ã“ã¨ã‚‚å¤šã„ã€‚ ã§ã€æœ€è¿‘ Dependency Injection ã¨ã„ã†ä¾å˜æ€§ã‚’ã†ã¾ã„ã“ã¨æŠ½è±¡åŒ–ã—ã¦ãŠãä»•çµ„ã¿ã«ã¤ã„ã¦å¦ã‚“ã ã®ã§ã€ãã® Scala ã«ãŠã‘ã‚‹ä»£è¡¨çš„ãªãƒ‡ã‚¶ã‚¤ãƒ³ãƒ‘ã‚¿ãƒ¼ãƒ³ã§ã‚ã‚‹ Cake Pattern ã§å®Ÿè£…ã—ãŸè©±ã§ã™ã€‚ Dependency Injection ä¾å˜æ€§ã®æ³¨å…¥ã¨ã‹è¨³ã•ã‚Œã‚‹ã€ä¾å˜ã—ã¦ã„ã‚‹ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã‚’ç›´æŽ¥ã‚¯ãƒ©ã‚¹ã®ä¸ã«æŒã£ã¦ãŠãã®ã§ã¯
pokutuna 2016/03/30
Scala
ãƒªãƒ³ã‚¯
Scala FAQ
Frequently asked questions, with brief answers and/or links to longer answers. This list only includes questions that actually come up over and over again in Scala chat rooms and forums. General questions Where can I ask Scala questions? See our Community page. Whatâ€™s a good book about Scala? Our Books page lists a few especially popular, well-known books. We donâ€™t have a list of all the Scala boo
pokutuna 2015/07/08
Scala
ãƒªãƒ³ã‚¯
é¢å€’ãã•ã„ãƒ‘ãƒ¼ã‚µã®å®Ÿè£…ã‚‚DSLã§æ›¸ãã ã‘ï¼ãã†ã€Scalaãªã‚‰ã - Qiita
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pokutuna 2015/07/03
Scala
ãƒªãƒ³ã‚¯
Flatten your code
When dealing with nested containers in Scala, like Future[Option[A]], you code quickly gets messy from deep nesting. This presentation shows a way toâ€¦
pokutuna 2015/06/26
Scala
ãƒªãƒ³ã‚¯
GitHub - lihaoyi/Metascala: A JVM written in Scala
Metascala is a tiny metacircular Java Virtual Machine (JVM) written in the Scala programming language. Metascala is barely 3000 lines of Scala, and is complete enough that it is able to interpret itself metacircularly. Being written in Scala and compiled to Java bytecode, the Metascala JVM requires a host JVM in order to run. The goal of Metascala is to create a platform to experiment with the JVM
pokutuna 2015/05/26
Scala
ãƒªãƒ³ã‚¯
refactor.scala
refactor.scala ï¿½P ï¿½ï¿½U ï¿½ï¿½U def index(id:String) = Action { getFirstData(id) } private def getFirstData(id:String) = { Cache.get(id) match { case Some(id2) => getSecondData(id2) case None => NotFound } } private def getSecondData(id2:String) = { Cache.get(id2) match { case Some(result) => Ok(result) case None => NotFound } } sample.scala Puï¿½ï¿½ï¿½U ï¿½ï¿½ï¿½ï¿½ï¿½U def index(id:String) = Action { Cache.get(id)
pokutuna 2014/07/12
Scala
ãƒªãƒ³ã‚¯
ç‹¬ç¿’ Scalaz â€” ç‹¬ç¿’ Scalaz
ç‹¬ç¿’ ScalazÂ ã“ã‚Œã¾ã§ã„ãã¤ã®ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°è¨€èªžãŒç¾Šã®è¡£ã‚’ç€ãŸ Lisp ã«å–©ãˆã‚‰ã‚ŒãŸã ã‚ã†ã‹? Java ã¯é¦´æŸ“ã¿è¦ªã—ã‚“ã C++ ã®ã‚ˆã†ãªæ–‡æ³•ã« GC ã‚’æŒã¡è¾¼ã‚“ã ã€‚ãã‚Œã¾ã§ä»–ã«ã‚‚ GC ã‚’è¼‰ã›ãŸè¨€èªžã¯ã‚ã£ãŸã‘ã©ã‚‚ã€ç¾å®Ÿçš„ã« C++ ã®ä»£æ›¿ã¨ãªã‚Šã†ã‚‹è¨€èªžã« GC ãŒè¼‰ã£ãŸã“ã¨ã¯ 1996å¹´ã«ã¯ç”»æœŸçš„ã«æ€ã‚ã‚ŒãŸã€‚ã‚„ãŒã¦æ™‚ã¯çµŒã¡ã€äººã€…ã¯è‡ªåˆ†ã§ãƒ¡ãƒ¢ãƒªç®¡ç†ã‚’ã—ãªã„ã“ã¨ã«æ…£ã‚Œã¦ã„ã£ãŸã€‚JavaScript ã¨ Ruby ã®ä¸¡è¨€èªžã‚‚ãã®ç¬¬ä¸€ç´šé–¢æ•° (first-class function) ã‚„ãƒ–ãƒãƒƒã‚¯æ§‹æ–‡ã‚’æŒã¤ã“ã¨ã‹ã‚‰ç¾Šã®è¡£ã‚’ç€ãŸ Lisp ã¨å‘¼ã°ã‚ŒãŸã“ã¨ãŒã‚ã‚‹ã€‚Så¼ã®åŒå›³åƒæ€§ãŒãƒžã‚¯ãƒã«é©ã™ã‚‹ã“ã¨ã‹ã‚‰ Lispç³»ã®è¨€èªžã¯ã¾ã é¢ç™½ã„ã¨æ€ã†ã€‚ è¿‘å¹´ã®è¨€èªžã¯ã‚‚ã†å°‘ã—æ–°ã—ã„é–¢æ•°åž‹è¨€èªžã‹ã‚‰æ¦‚å¿µã‚’å€Ÿã‚Šã‚‹ã‚ˆã†ã«ãªã£ã¦ããŸã€‚åž‹æŽ¨è«–ã‚„ãƒ‘ã‚¿ãƒ¼ãƒ³ãƒžãƒƒãƒãƒ³ã‚°ã¯ ML ã«ã•ã‹ã®ã¼ã‚‹ã“ã¨ãŒã§ãã‚‹ã¨æ€ã†ã€‚æ™‚ãŒçµŒã¦ã°ã€äºº
pokutuna 2014/06/19
Scala
ãƒªãƒ³ã‚¯
å€¤ã‚¯ãƒ©ã‚¹ã¨æ±Žç”¨ãƒˆãƒ¬ã‚¤ãƒˆ
Mark Harrah è‘— Eugene Yokota è¨³ ã¯ã˜ã‚ã« å€¤ã‚¯ãƒ©ã‚¹ (value class) ã¯å®Ÿè¡Œæ™‚ã®ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã®å‰²ã‚Šå½“ã¦ã‚’å›žé¿ã™ã‚‹ãŸã‚ã® Scala ã®æ–°ã—ã„æ©Ÿæ§‹ã ã€‚ ã“ã‚Œã¯æ–°ãŸã«å®šç¾©ä»˜ã‘ã•ã‚Œã‚‹ AnyVal ã®ã‚µãƒ–ã‚¯ãƒ©ã‚¹ã«ã‚ˆã£ã¦å®Ÿç¾ã•ã‚Œã‚‹ã€‚ ã“ã‚Œã¯ SIP-15 ã«ã¦ææ¡ˆã•ã‚ŒãŸã€‚ ä»¥ä¸‹ã«æœ€å°é™ã®å€¤ã‚¯ãƒ©ã‚¹ã®å®šç¾©ã‚’ç¤ºã™: ã“ã‚Œã¯ãŸã 1ã¤ã®ã€public ãª val ãƒ‘ãƒ©ãƒ¡ãƒ¼ã‚¿ã‚’æŒã¡ã€ã“ã‚ŒãŒå†…éƒ¨ã§ã®å®Ÿè¡Œæ™‚ã®ãƒ‡ãƒ¼ã‚¿æ§‹é€ ã¨ãªã‚‹ã€‚ ã‚³ãƒ³ãƒ‘ã‚¤ãƒ«æ™‚ã®åž‹ã¯ Wrapper ã ãŒã€å®Ÿè¡Œæ™‚ã®ãƒ‡ãƒ¼ã‚¿æ§‹é€ ã¯ Int ã ã€‚ å€¤ã‚¯ãƒ©ã‚¹ã¯ def ã‚’å®šç¾©ã™ã‚‹ã“ã¨ãŒã§ãã‚‹ãŒã€valã€varã€ã¾ãŸã¯å…¥ã‚Œåã® traitã€classã€object ã¯è¨±ã•ã‚Œãªã„:
pokutuna 2014/05/14
Scala
ãƒªãƒ³ã‚¯
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