Kotlin: Data Classes: copy function

By default, Kotlin data class generate copy function. By using copy function, we can copy data object by altering some of its properties.

         var employee1 = Employee("Krishna", "Gurram", "India")

         var employee2 = employee1.copy(firstName = "Chamu")

Find the below working application.

Test.kt

package com.sample.test

data class Employee(var firstName: String, var lastName: String, var country: String)

fun main(args: Array<String>) {
 var employee1 = Employee("Krishna", "Gurram", "India")
 var employee2 = employee1.copy(firstName = "Chamu")

 println("employee1 : $employee1")
 println("employee2 : $employee2")
}

Output

employee1 : Employee(firstName=Krishna, lastName=Gurram, country=India)
employee2 : Employee(firstName=Chamu, lastName=Gurram, country=India)

Can I provide explicit implementation of copy function?
No, it is not allowed.

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