Scala - Default Parameter Values for a Function


Scala lets you specify default values for function parameters. The argument for such a parameter can optionally be omitted from a function call, in which case the corresponding argument will be filled in with the default. If you specify one of the parameters, then first argument will be passed using that parameter and second will be taken from default value.

Try the following example, it is an example of specifying default parameters for a function −


object Demo {
   def main(args: Array[String]) {
      println( "Returned Value : " + addInt() );
   def addInt( a:Int = 5, b:Int = 7 ) : Int = {
      var sum:Int = 0
      sum = a + b

      return sum

Save the above program in Demo.scala. The following commands are used to compile and execute this program.


\>scalac Demo.scala
\>scala Demo


Returned Value : 12