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
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