Difference between case class and case object?

Question

I am learning Scala and Akka and in my recent lookup for a solution, I found something like

 case class TotalTaxResult(taxAmount:Double)
 case object TaxCalcul         


        

Answer 1

You can think of these two to be just like a class and an object in general. When you do a case class ClassName(params list) it creates a blueprint for making objects and case object defines a singleton object in the scope in which it is declared. Starting with Scala 2.10, you should always use case objects instead of case classes with no arguments. So when you want to do a pattern match on some values which need arguments you should go for a case class, but if your values don't take arguments then you should use a case object.