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Comment by thebluesky | Hacker News Reader

Scala for the Impatient is definitely the best introduction to Scala (by a wide margin). Re-posting your link: http://blog.typesafe.com/free-pdf-from-typesafe-scala-for-th...

The preferred way of launching an app in Scala is as follows:

  object HelloWorld extends App {
    println("Hello, world!")
  }

Rather than manually creating a main method, as is done in the OP blog.

It's also possible to simply write:

  println("Hello World")

and that would be the entire app, but the preferred way of doing things is to extend App