Data Classes and Sealed Types

Data Class Basics

Store a few related values in a compact data class.

data-class A data class creates useful value-focused behavior for simple records.

Data Class Basics

priority
DataClassBasics.kt
Replay: real traced execution (multi-file project)
data class Ticket(val code: String, val priority: Int)

fun main() {
    val priority = 2
    val ticket = Ticket("A", priority)
    val label = "${ticket.code}:${ticket.priority}"

    println("priority=$priority")
    println("label=$label")
}

data class Ticket(val code: String, val priority: Int)

fun main() {
    val priority = 1
    val ticket = Ticket("A", priority)
    val label = "${ticket.code}:${ticket.priority}"

    println("priority=$priority")
    println("label=$label")
}

data class Ticket(val code: String, val priority: Int)

fun main() {
    val priority = 5
    val ticket = Ticket("A", priority)
    val label = "${ticket.code}:${ticket.priority}"

    println("priority=$priority")
    println("label=$label")
}

  1. priority ← 2, label ← A:2

    3fun main() {4    val priority→ 2 = 2 //@priority=1, 55    val ticket = Ticket("A", priority2)6    val label→ A:2 = "${ticket.codeA}:${ticket.priority2}"78    println("priority=$priority2")9    println("label=$labelA:2")10}
    outputpriority=2
label=A:2

  1. priority ← 1, label ← A:1

    3fun main() {4    val priority→ 1 = 15    val ticket = Ticket("A", priority1)6    val label→ A:1 = "${ticket.codeA}:${ticket.priority1}"78    println("priority=$priority1")9    println("label=$labelA:1")10}
    outputpriority=1
label=A:1

  1. priority ← 5, label ← A:5

    3fun main() {4    val priority→ 5 = 55    val ticket = Ticket("A", priority5)6    val label→ A:5 = "${ticket.codeA}:${ticket.priority5}"78    println("priority=$priority5")9    println("label=$labelA:5")10}
    outputpriority=5
label=A:5