class Greeter(prefix: String, suffix: String) {
  def greet(name: String): Unit =
    println(prefix + name + suffix)
}

val greeter = new Greeter("Hello, ", "!")
greeter.greet("Scala developer") // Hello, Scala developer!

new Plot { title = "Interactive Plots in Scala"}.add(new Bars { y = Seq(3, 5, 2, 3, 7)})