Main.scala

object Main extends App{
  
  /**********
   * define methd
   **********/
  def plus(a: Int, b: Int): Int = {
    a + b
  }
  
  // no arguments
  def threeXthree = {
    3*3
  }
  
  // 1 Line
  def multiply(a: Int, b:Int) = a * b
  
  /**********
   * return
   **********/
  def withReturn: Int = {
    return 1
    
    // not reachable below
    println("reach after return")
    3
  }
  
  println(s"withReturn: ${withReturn}")
   
  def noReturn = {
    1
  }
  
  println(s"noReturn: ${noReturn}")
  
  // Unit
  def unitMethod: Unit = {
    5 * 5
  }
  
  
  def unitMethos2 {
    5 * 5
  }
  
   
  /***********
   * valuable arguments
   **********/
  def sum(args: Int*) = {
    println("========= called sum =========")
    println(s"\targument size: ${args.size}")
    println(s"\targument: ${args}")
    args.sum
  }
  
  val sumResult = sum(1, 1, 1)
  println(s"sum: ${sumResult}")
  
  val list = List(1, 2, 3)
  val sumResult2 = sum(list:_*)
  println(s"sum: ${sumResult2}")
 
}