引数の前にimplicitキーワードをつけることでその引数が暗黙の引数になる。
scala> def sum(x:Int,y:Int,z:Int):Int = x + y + z sum: (x: Int, y: Int, z: Int)Int scala> sum(1,2,3) res0: Int = 6 scala> def sum(x:Int)(y:Int)(z:Int):Int = x + y + z sum: (x: Int)(y: Int)(z: Int)Int scala> sum(1)(2)(3) res1: Int = 6 scala> def greeting(name:String)(implicit greet:String) = { | println(greet + name) | } greeting: (name: String)(implicit greet: String)Unit scala> greeting("taro") <console>:9: error: could not find implicit value for parameter greet: String greeting("taro") ^ scala> greeting("taro")("good morning!") good morning!taro scala> implicit val hello:String = "hello!" hello: String = hello! scala> greeting("taro") hello!taro