Data classes in kotlin are classes created to do nothing but hold data. Such classes are marked as data:
data class User(var firstname: String, var lastname: String, var age: Int)
The code above creates a User class with the following automatically generated:
vals)equals()hashcode()toString()copy()componentN() (where N is 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.