Some examples of working with case classes

	package matchers
	object MatcherDemo {
	abstract class Animal(val name: String)
	case class Fish(override val name: String) extends Animal(name)
	case class Mammal(override val name:String) extends Animal(name)
	case class Reptile(override val name:String) extends Animal(name)
	case class Bird(override val name:String) extends Animal(name)
	val animals: List[Animal] = List(Mammal("Whale"),Fish("Tuna"), Mammal("Human"),
	Bird("Owl"), Fish("Shark"), Reptile("Crocodile"), Fish("Shark"))
	//filter all fish
	val fishes = animals collect {case a: Fish => a }
	/**
	List(Fish(Tuna), Fish(Shark), Fish(Shark))
	**/
	//filter animals with letter 'o' in name
	val animalsWithLetterO = animals.filter(a => a.name.toLowerCase().contains("o"))
	/**
	List(Bird(Owl), Reptile(Crocodile))
	**/
	val animalsGrouped = animals groupBy identity
	/**
	Map(
	Fish(Shark) -> List(Fish(Shark), Fish(Shark)),
	Bird(Owl) -> List(Bird(Owl)),
	Mammal(Whale) -> List(Mammal(Whale)),
	Fish(Tuna) -> List(Fish(Tuna)),
	Mammal(Human) -> List(Mammal(Human)),
	Reptile(Crocodile) -> List(Reptile(Crocodile))
	)
	**/
	val animalsByType = animals.groupBy(a => a.getClass().getName())
	/**
	Map(
	matchers.MatcherDemo$Bird -> List(Bird(Owl)),
	matchers.MatcherDemo$Mammal -> List(Mammal(Whale), Mammal(Human)),
	matchers.MatcherDemo$Fish -> List(Fish(Tuna), Fish(Shark), Fish(Shark)),
	matchers.MatcherDemo$Reptile -> List(Reptile(Crocodile))
	)
	**/
	}

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