packages.kt

package packages

import kotlin.random.Random

data class Stamp(val price: Double)
data class Package(val address: String, var stamp: Stamp? = null) {
    fun unpack(): Any = TODO("Not yet implemented")
}

object MailService {
    fun sendPackage(pack: Package): Package {
        TODO("Not yet implemented")
    }
}

fun applyExample() {
    val address = "Someone somewhere 12345"
    val pack = Package(address)
        .apply { this.stamp = Stamp(50.0) }

    MailService.sendPackage(pack)
}

fun runExample() {
    val address = "Someone somewhere 12345"
    val stamp = Stamp(50.0)
    val brokenPackage = Package(address, stamp)
    val pack = brokenPackage.run {
        Package(this.address, this.stamp)
    }

    MailService.sendPackage(pack)
}

fun alsoExample() {
    val address = "Someone somewhere 12345"
    val stamp = Stamp(50.0)
    val pack = Package(address, stamp)

    MailService.sendPackage(pack).also {
        informCustomer(it.address)
    }
}

fun letExample() {
    val content = openPackage()?.let {
        registerAddress(it.address)
        it.unpack()
    } ?: "nothing in there"

    playAroundWith(content)
}

fun registerAddress(address: String) {
    TODO("Not yet implemented")
}

fun playAroundWith(content: Any) {
    TODO("Not yet implemented")
}

fun informCustomer(address: String) {
    TODO("Not yet implemented")
}

fun openPackage(): Package? {
    return if (Random.nextBoolean())
        Package("Someone somewhere 12345")
    else null
}