Main.scala

object Main extends App{
  /******************
   * val : immutable valuable
   ******************/
  val one: Int = 1
  println(s"one is ${one}")
  
  val two = 2
  println(s"two is ${two}")
  
  // compile error: type mismatch;
  // val three: Int = "three"
  
  val name = "Kuchitamaaaa"
  // compile error 
  // val name = "Kuchitama"
  println(s"name is ${name}")
  
  /******************
   * var : mutable valuable
   ******************/
  var counter = 0
  for (_ <- 1 to 5) {
    counter = counter + 1
    println(s"current counter is ${counter}")
  }
  
  
  /******************
   * lazy val
   ******************/
  var now = 0
  lazy val lazyNow = now
  
  println(s"now is ${now}")
  now = now + 1
  println(s"now is ${now}, lazyNow is ${lazyNow}")
  now = now + 1
  println(s"now is ${now}, lazyNow is ${lazyNow}")
}