When to use the equals sign in a Scala method declaration?

Question

With equals sign:

object HelloWorld {
  def main(args: Array[String]) = {
    println(\"Hello!\")
  }
}

Without equals sign:

Answer 1

As time as progressed the default style has changed, and this has been mentioned in many of the comments to answers, it is recommended in the official style guide to use the = syntax for function declarations.