EvalQuestion.scala

object Main extends App {

  import cats._
  import cats.implicits._

  private val now: Eval[Double] = Eval.now(math.random)
  println(now.value)
  println(now.value)

  private val later: Eval[Double] = Eval.later(math.random)
  println(later.value)
  println(later.value)

  private val always: Eval[Double] = Eval.always(math.random)
  println(always.value)
  println(always.value)

}