Scala case class extending Product with Serializable

Question

I am learning scala and tried following form Scala Cookbook:

trait Animal
trait FurryAnimal extends Animal
case class Dog(name:String) extends Animal
case cl         


        

Answer 1

All case classes automatically extend Product and Serializable. It looks ugly ? yes. Basically ,Product can be viewed as heterogeneous collections. All Product classes viz. (Product1 , Product2 ...) extends Product which contains some common methods to use like productArity , productElement etc.

Like Case classes other types that extends Product are List,Tuple etc

From my scala worksheet,

  val product : Product = (10,"String",3)         //> product  : Product = (10,String,3)
  product.productArity                            //> res0: Int = 3
  product.productElement(0)                       //> res1: Any = 10
  product.productElement(1)                       //> res2: Any = String
  product.productElement(2)                       //> res3: Any = 3

case class ProductCase(age:Int,name:String,ISBN:Int)
  ProductCase(23,"som",5465473).productArity      //> res4: Int = 3

For details look here.