Scala higher-order functions
Higher-order functions (Higher-Order Function) is a function of the other functions of the operation.
Scala allowed higher-order functions, higher-order functions can be used as a parameter to another function, or as a function of the output.
The following example, apply () function uses another function f v and values as parameters, and then call the function f parameter v:
object Test { def main(args: Array[String]) { println( apply( layout, 10) ) } // 函数 f 和 值 v 作为参数,而函数 f 又调用了参数 v def apply(f: Int => String, v: Int) = f(v) def layout[A](x: A) = "[" + x.toString() + "]" }
Implementation of the above code, the output is:
$ scalac Test.scala $ scala Test [10]