What does a method turn into with the equal sign left out in Scala?

Question

I\'ve just found out that it\'s possible not to use the sign of = when defining a method in Scala.

def someMethod(a: Int) {
  println(a)
  println(\         


        

Answer 1

Such method definition is called procedure. It's a special syntax for Unit-returning methods:

def someMethod(a: Int): Unit = {
  println(a)
  println("---------")
}

It's not a recommended syntax. Martin Odersky believes it was a bad decision to include this syntax. See Keynote - Scala with Style chapter 45.