Data classes in kotlin are classes created to do nothing but hold data. Such classes are marked as
data class User(var firstname: String, var lastname: String, var age: Int)
The code above creates a
User class with the following automatically generated:
Nis the corresponding property in order of declaration)
Just as with a function, default values can also be specified:
data class User(var firstname: String = "Joe", var lastname: String = "Bloggs", var age: Int = 20)
More details can be found here Data Classes.