Scala Language Case Classes Create a Copy of an Object with Certain Changes


Example

Case classes provide a copy method that creates a new object that shares the same fields as the old one, with certain changes.

We can use this feature to create a new object from a previous one that has some of the same characteristics. This simple case class to demonstrates this feature:

case class Person(firstName: String, lastName: String, grade: String, subject: String)
val putu = Person("Putu", "Kevin", "A1", "Math")
val mark = putu.copy(firstName = "Ketut", lastName = "Mark")
// mark: People = People(Ketut,Mark,A1,Math)

In this example we can see that the two objects share similar characteristics (grade = A1, subject = Math), except where they have been specified in the copy (firstName and lastName).