Scala Future coffee code from Neophyte

coffee.scala

def prepareCappuccino(): Future[Cappuccino] = {
  val groundCoffee = grind("arabica beans")
  val heatedWater = heatWater(Water(20))
  val frothedMilk = frothMilk("milk")
  for {
    ground <- groundCoffee
    water <- heatedWater
    foam <- frothedMilk
    espresso <- brew(ground, water)
  } yield combine(espresso, foam)
}

// part 8 https://danielwestheide.com/blog/the-neophytes-guide-to-scala-part-8-welcome-to-the-future/