Call by Value, Name, Need

Exercise 1

1. Make it a call by name
2. Make it a call by need by adding a lazy val

def exercise(str: String) = 
  
  Thread.sleep(2000)
  println(s"first: $str at ${System.nanoTime()}")

  Thread.sleep(2000)
  println(s"second: $str at ${System.nanoTime()}")

exercise("hello")

Exercise 2

Create a function def currentTime(time: Long)

1. Make it a call by value
2. Make it a call by name
3. Make it a call by need by adding a lazy val