data class kotlin
data class User(val name: String, val age: Int)
fun main(args: Array<String>) {
val u1 = User("John", 29)
// using copy function to create an object
val u2 = u1.copy(name = "Randy")
println("u1: name = ${u1.name}, name = ${u1.age}")
println("u2: name = ${u2.name}, name = ${u2.age}")
}