Scala allows the definition of higher order functions. 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 function to v.

Example:

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 following result.

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

Scala allows the definition of higher order functions. 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 function to v.

Example:

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 following result.

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