Functions and Anonymous Classes in Scala PRO

When calling a function we indirectly invoke the apply method on the object that represents the function. We can use the anonymous inner class syntax for defining a new anonymous inner class that extends the Function relevant trait in order to create a new function. The following code sample shows that.

object HelloSample
{
  def main(args:Array[String]):Unit =
  {
    val func1 = (num:Int) => 2*num
    println(func1(4))
    val func2 = new Function1[Int,Int]
    {
      def apply(num:Int) = 2*num
    }
    println(func2(4))
  }
}

The following video shows the execution of this code sample, overviews it and provides more in-depth explanation.