Hello World (Scala)

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This example shows the well-known "Hello World!" example implemented in Scala.

You define it through the keyword object which introduces a Singleton object

<<HelloWorld.scala>>=
object HelloWorld {
  def main(args: Array[String]) = {
    Console.println("Hello, world!");
  }
}

You can also use the Application mixin that saves you from defining the main method for simple examples and executes from the singleton body

<<HelloWorld2.scala>>=
object HelloWorld extends Application {
   Console.println("Hello, world!");
}

Compiling and running

If you have installed Scala, the HelloWorld.scala program can be compiled using the scala compiler. To compile to an executable, the compiler should be invoked as follows:

scalac HelloWorld.scala

The resulting helloworld executable can be run from the command line.

scala HelloWorld

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