Default and parameterized constructors

The primary constructor for any class defined in Scala is the body itself. It means that whatever you declare and define inside a class body gets instantiated when you make an instance of it. There are other ways to define secondary/auxiliary constructors as well. Take a look at the following case classes:

import java.time.LocalDate

case class Employee(name: String, id: String, contact: String, email: String) 

case class StartUp(name: String, founder: Employee, coFounders: Option[Set[Employee]], members: Option[List[Employee]], foundingDate: Option[LocalDate]) 

We can see two case classes named Employee and StartUp. You may wonder why Employee is specific to our StartUp class. The StartUp case class takes a few attributes such as founder, coFounder, members, and foundingDate. So, for creating instances of these case classes, we have to provide values for each member. In this case, if someone on the client side wants to use this case class and does not...