pearlsInScala.scala

// Map a list to a frequency list by using groupBy with identity and mapValues
val chars = "Peace and harmony"
chars.groupBy(identity).mapValues(_.size).toList

//Use a tupple: type to pass in two arguments for pattern matching, like goldilocks("porridge", "Mama")
def goldilocks(tuple: (String, String)) = tuple match {
    case ("porridge", "Papa") ⇒ "Papa eating porridge"
    case ("porridge", "Mama") ⇒ "Mama eating porridge"
    case ("porridge", "Baby") ⇒ "Baby eating porridge"
    case _ ⇒ "what?"
  }                                               //> goldilocks: (tuple: (String, String))String

  assert(goldilocks("porridge", "Mama") == "Mama eating porridge")