How Scala Higher Order function works in Scala

Question

Can anyone provide an example on how Scala Higher Order function works in Scala?

Answer 1

Hey,

Scala allows the definition of a higher-order function. These are functions that take other functions as parameters, or whose result is a function. In the following example, apply () function takes another function 'f' and a value 'v' and applies the function to v.

object Test {
 def main(args: Array[String]) {
 println( apply( layout, 10) )
 }
 def apply(f: Int => String, v: Int) = f(v)
 def layout[A](x: A) = "[" + x.toString() + "]"

When the above code is compiled and executed, it produces the following result 

         C:/>scalac Test.scala
          C:/>scala Test
          [10]
          C:/>

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