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Unit type in Scala | Tutorial on Scala Unit type

Scala Unit Type: Unit type in Scala is like a void in java i.e. it is used when nothing needs to be returned by the function. In this tutorial on Unit type in Scala, we will see a working example of how the Unit type works?
Submitted by Shivang Yadav, on July 22, 2019

Scala Unit type

The Unit type in Scala is used as a return statement for a function when no value is to be returned. Unit type can be e compared to void data type of other programming languages like Java. It is a subclass of anytype trait and is used when nothing means to return by the function.

Program to illustrate the working of unit type in Scala

object MyClass {
      def printval(a: String): Unit = {
          println("Hello! "+a)
      }

      def main(args: Array[String]) {
        val a = printval("IncludeHelp")
        println("Value returned is "+a)
      }
   }

Output

Hello! IncludeHelp
Value returned is ()

Syntax to define a main() method with Unit type

    def main(args: Array[String]) : Unit = { 
    } 

Example of main() method with Unit type

object MyClass {
    def main(args: Array[String]): Unit = {
        println("Hello world!");
    }
}

Output

Hello world!