Readability.kt

//Declare a Person Class
data class Person(val name: String) {
    var age: Int = 0
}

val person1 = Person("John")
val person2 = Person("John")

person1.age = 10
person2.age = 20

// copy an object
fun copy(name: String = this.name, age: Int = this.age) = User(name, age) 

val jack = User(name = "Jack", age = 1)
val olderJack = jack.copy(age = 2)

// prints "Jane, 35 years of age"
val jane = User("Jane", 35) 
val (name, age) = jane
println("$name, $age years of age")