// Numbers
val answerToEverything: Int = 42
val jackPot: Int = 1_000_000

val poorApproximation: Double = 3.14


// Text
val firstInitial: Char = 'N'
val lastInitial: Char = 'D'

val faveWord: String = "howdy"


// Bundling values together
data class Coordinate2D(val x: Int, val y: Int)

val coordinateOrigin: Coordinate2D = Coordinate2D(0, 0)

data class LabeledCoordinate2D(val location: Coordinate2D, val name: String)

val faveRestaurant: LabeledCoordinate2D = LabeledCoordinate2D(
    location = Coordinate2D(1, 2),
    name = "Dishoom"
)


// Small set of options
val yes: Boolean = true
val no: Boolean = false

enum class TrafficLight {
    RED,
    YELLOW,
    GREEN,
}

val currentLight: TrafficLight = TrafficLight.RED
val nextLight: TrafficLight = TrafficLight.GREEN

sealed class Author {
    // don't know :(
    object Unknown: Author()

    // known human
    data class FullName(
        val firstName: String, 
        val lastName: String
    ): Author()

    // tricksy!
    data class Pseudonym(
        val knownAs: FullName, 
        val realName: FullName
    ): Author()
}

val authorUnknown: Author = Author.Unknown

val authorCarl: Author = Author.FullName("hank", "green")

val authorACMW: Author = Author.Pseudonym(
    knownAs = Author.FullName(
        firstName = "mary", 
        lastName = "westmacott"
    ),
    realName = Author.FullName(
        firstName = "agatha", 
        lastName = "christie"
    ),
)