Adventures with Scala Macros
This article was originally posted on my own blog but is cross posted here, where the subsequent articles in the series will appear. With the arrival of Scala 2.10 came two interesting new features: the reflection API and macros. The possibilities for macros are many, and one that I want to explore is how you can use a macro to create a Play Framework REST API from a data model represented as a se
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scala.util.control.Exception._を使ã£ãŸã‚µãƒ³ãƒ—ル集 - seratch's weblog in Japanese
å‚考 Scala Standard Library 2.9.1.final /scala/tags/R_2_9_1_final/src/library/scala/util/control/Exception.scala – Scala Scalaã§ã®ä¾‹å¤–å‡¦ç† - Either,Option,util.control.Exception - ( ꒪⌓꒪) ゆるよã‚日記 サンプル 以下ã®ã‚µãƒ³ãƒ—ルã¯scala.util.control.Exception._ãŒimportã•ã‚Œã¦ã„ã‚‹ã“ã¨ã‚’å‰æã«ã—ã¦ã„ã¾ã™ã€‚ import scala.util.control.Exception._ allCatch val result = try { throw new Exception } catch { case e => } ã¾ãšå˜ã«allCatchã‚’ã¤ã‘ã‚‹ã ã‘ã ã¨ä½•ã‚‚変ã‚ã‚Šã¾ã›ã‚“。例外ã¯ãã®ã¾ã¾th
Why does the Scala compiler disallow overloaded methods with default arguments?
While there might be valid cases where such method overloadings could become ambiguous, why does the compiler disallow code which is neither ambiguous at compile time nor at run time? Example: // This fails: def foo(a: String)(b: Int = 42) = a + b def foo(a: Int) (b: Int = 42) = a + b // This fails, too. Even if there is no position in the argument list, // where the types are the same. def foo(a:
プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°è¨€èªžScala æ—¥æœ¬èªžæƒ…å ±ã‚µã‚¤ãƒˆ - é™çš„åž‹ã§ã§ãã‚‹ã“ã¨(1)
ã„ããªã‚Šã§ã™ãŒã€ã“ã®ã‚³ãƒ©ãƒ ã‚’èªã‚“ã§ãŠã‚‰ã‚Œã‚‹æ–¹ã€…ã¯ã€é™çš„型付ã‘ã«å¯¾ã—ã¦ã©ã®ã‚ˆã†ãªã‚¤ãƒ¡ãƒ¼ã‚¸ã‚’ã‚‚ã£ã¦ãŠã‚‰ã‚Œã‚‹ã§ã—ょã†ã‹ã€‚今ã¾ã§ã€é™çš„型付㑠VS. 動的型付ã‘ã®è°è«–ã‚’ã•ã‚“ã–ん見ã¦ãã¾ã—ãŸãŒã€é™çš„åž‹ã®èƒ½åŠ›ã«é–¢ã—ã¦æ£ã—ãç†è§£ã•ã‚Œã¦ã„ã‚‹è°è«–ã‚’ã‚ã¾ã‚Šè¦‹ã‹ã‘ãŸã“ã¨ãŒã‚ã‚Šã¾ã›ã‚“。é™çš„型付㑠VS. 動的型付ã‘ã®è°è«–ã§ã€é™çš„型付ã‘(ãŠã‚ˆã³æ˜Žç¤ºçš„ãªåž‹ä»˜ã‘)ã®ãƒ¡ãƒªãƒƒãƒˆã¨ã—ã¦ä¸»ã«æŒ™ã’られるã®ã¯æ¬¡ã®ï¼’点ã§ã—ょã†ã€‚ コンパイル時ã«å˜ç´”ãªã‚¨ãƒ©ãƒ¼ã‚’発見ã™ã‚‹ã“ã¨ãŒã§ãã‚‹ é™çš„型を明示的ã«æ›¸ãã“ã¨ã«ã‚ˆã‚Šã€ã‚³ãƒ¼ãƒ‰ã‚’èªã‚€äººé–“ã«ã‚ˆã‚Šå¤šãã®æƒ…å ±ãŒä¼ã‚ã‚‹ ã“れらã®ãƒ¡ãƒªãƒƒãƒˆã¯é–“é•ã„ã§ã¯ã‚ã‚Šã¾ã›ã‚“ãŒã€ã‚ãã¾ã§Javaçš„ãªåž‹ã‚·ã‚¹ãƒ†ãƒ 上ã§ã®è©±ã§ã‚ã‚Šã€é™çš„型システムã«ã‚ˆã£ã¦æ¤œå‡ºã§ãã‚‹ã“ã¨ã¯ã€ã‚‚ã£ã¨ãŸãã•ã‚“ã‚ã‚Šã¾ã™ã€‚ã“ã®ã‚·ãƒªãƒ¼ã‚ºã§ã¯ã€Scalaã®é™çš„型システムを駆使ã™ã‚‹ã“ã¨ã§ã€ã©ã®ã‚ˆã†ãªäº‹ãŒã§ãã‚‹ã®ã‹ã‚’紹介ã—ã¦ã„ããŸã„ã¨æ€ã„ã¾ã™ã€‚ ã“ã“ã§ç¬¬1回ã®é¡Œ
Overview
This doc page is specific to features shipped in Scala 2, which have either been removed in Scala 3 or replaced by an alternative. Unless otherwise stated, all the code examples in this page assume you are using Scala 2. EXPERIMENTAL Heather Miller, Eugene Burmako, Philipp Haller Reflection is the ability of a program to inspect, and possibly even modify itself. It has a long history across object
航海日誌: 2013-01-06: [Scala][プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°] Scala 2.10リリース!
概è¦é•·ã‚‰ãRCã ã£ãŸScala 2.10ãŒã¨ã†ã¨ã†ãƒªãƒªãƒ¼ã‚¹ã•ã‚Œã¾ã—ãŸã€‚Scala 2.10.0 now available!ãªãŠæ—¥æœ¬èªžã®ç¿»è¨³ãŒå˜åœ¨ã—ã¾ã™ã®ã§ã€è©³ç´°ã¯ã“ã¡ã‚‰ã‚’ã©ã†ãžã€‚ガイドã¨æ¦‚è¦ - Scala Documentation新機能Value Classesclassã¯ã€structåž‹(制é™äº‹é …ãŒé©ç”¨ã•ã‚Œã¾ã™)ã®ã‚ˆã†ã«å‹•ä½œã•ã›ã‚‹ãŸã‚ã«AnyValを継承ã™ã‚‹ã“ã¨ãŒã§ãる。http://docs.scala-lang.org/overviews/core/value-classes.html値クラスを定義ã§ãるよã†ã«ãªã‚Šã¾ã—ãŸã€‚ã“ã‚Œã¯å®Ÿè¡Œæ™‚ã¯å…ƒã®åž‹(例ãˆã°Primitiveåž‹)ã¨ã—ã¦ä½¿ã‚ã‚Œã€structåž‹ã®ã‚ˆã†ãªæ§‹é€ を構築ã§ãるよã†ã§ã™ã€‚汎用trait(Anyã®æ‹¡å¼µ)ã«ã‚ˆã‚‹æ‹¡å¼µã‚„defã®ã¿ã®ãƒ¡ãƒ³ãƒã€åˆæœŸåŒ–を一切行ã‚ãªã„ãªã©ã®åˆ¶é™ãŒã‚ã‚Šã¾ã™ã€‚ã“ã®å€¤ã‚¯ãƒ©ã‚¹ã®æ„義ã¯ãƒªã‚½ãƒ¼ã‚¹é¢ã§ä¸åˆ©ãªãƒ©ãƒƒãƒ‘
Play2 Scala + jacoco4sbt + jenkins ã§ã‚«ãƒãƒ¬ãƒƒã‚¸ã‚’å–ã‚‹ - ikeike443ã®ãƒ–ãƒã‚°
Play2 Scalaã§ä½œã£ãŸãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆã‚’Jenkins上ã§è‡ªå‹•ãƒ†ã‚¹ãƒˆã™ã‚‹ã®ã¯ç°¡å˜ã€‚フリースタイルジョブã§ä½œã£ã¦ã‚·ã‚§ãƒ«ã®å®Ÿè¡Œã®ã¨ã“ã‚ã«ä¸‹è¨˜ã®ã‚ˆã†ã«æ›¸ã„ã¦ã‚„ã‚Œã°æ™®é€šã«å‹•ã。JUnitスタイルã®XMLã‚’åã„ã¦ãれるã®ã§ã€ãƒ†ã‚¹ãƒˆçµæžœã‚’Jenkins上ã§ç¶ºéº—ã«æ•´å½¢ã—ã¦ã¿ã‚‹ã“ã¨ãŒã§ãる。 play clean play test ã§ã‚‚ã‚«ãƒãƒ¬ãƒƒã‚¸ã¨ãªã‚‹ã¨è©±ã¯åˆ¥ã§ã€Play1ã®æ™‚ã®ã‚ˆã†ã«CoberturaプラグインãŒç”¨æ„ã•ã‚Œã¦ã‚‹ã‚ã‘ã§ã‚‚ãªãã€ä¸Šæ‰‹ã„方法ãŒã‚ã‚‹ã®ã‹ã©ã†ã‹ã‚ˆã分ã‹ã‚‰ãªã„。 ã§ã‚‚ã£ã¦ã€Scalaã§ã‚«ãƒãƒ¬ãƒƒã‚¸è¨ˆæ¸¬ãŒã§ãるツールãªã„ã‹ãªã¨æŽ¢ã—ã¦ãŸã‚“ã ã‘ã©ã€ãƒ¡ãƒ³ãƒ†ãŒæ¢ã¾ã£ã¦ã‚‹ã®ãŒæ•°å€‹è¦‹ã¤ã‹ã£ãŸãらã„ã§ã„ã„ã®ãŒãªã‹ã£ãŸã€ã‚“ã ã‘ã©ã€ä¸€å€‹ã„ã„æ„Ÿã˜ã®ã‚’見ã¤ã‘ãŸã€‚ jacoco4sbt https://bitbucket.org/jmhofer/jacoco4sbt/wiki/Home jacocoã® fo
Mapを極ã‚ã‚‹ - key->valueã®ç´¢å¼•ã®ä½¿ã„æ–¹ | Scala Cookbook
Map㯠key -> valueã®ç´¢å¼•ã®ãŸã‚ã®ãƒ‡ãƒ¼ã‚¿æ§‹é€ 。keyã®å€¤ã«ã¯é‡è¤‡ã‚’許ã•ãªã„。 Mapã®ä½œæˆ scala> val m = Map(1 -> "Apple", 2 -> "Banana", 3 -> "Chocolate") m: scala.collection.immutable.Map[Int,java.lang.String] = Map(1 -> Apple, 2 -> Banana, 3 -> Chocolate) 1 -> "Apple"ã®éƒ¨åˆ†ã§ã¯ã€(1, "Apple")ã®TupleãŒç”Ÿæˆã•ã‚Œã€æœ€çµ‚çš„ã«Map.apply(elems:(A, B)*)ãŒå‘¼ã°ã‚Œã¦ã„る。 Builderを使ã£ã¦Mapã‚’ä½œæˆ val m = { val b = Map.newBuilder[Int, String] b += 1 -> "Apple" b += 2 -> "Banana
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独習 Scalaz: 11日目 | eed3si9n
Simple macro-based wrapper example
Scala - how to define a structural type that refers to itself?
Drop into interpreter during arbitrary scala code location
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