अनाम ऑब्जेक्ट

open class Animal { open fun sound() = "..." }

fun main() {
    val cat = object : Animal() {
        override fun sound() = "Meow"
    }
    println(cat.sound())
}

fun main() {
    val point = object {
        val x = 3
        val y = 4
    }
    println("${point.x}, ${point.y}")
}

fun main() {
    val config = object {
        val retries = 3
        val timeout = 30
    }
    println(config.retries)
}

fun makeCounter(start: Int): () -> Int {
    var count = start
    val obj = object {
        fun next() = count++
    }
    return { obj.next() }
}

fun main() {
    val c = makeCounter(10)
    println(c())
    println(c())
}

interface OnDone { fun done(result: Int) }

fun compute(cb: OnDone) {
    cb.done(42)
}

fun main() {
    compute(object : OnDone {
        override fun done(result: Int) = println("Got $result")
    })
}

interface Named { val name: String }

fun make(): Named = object : Named {
    override val name = "X"
}

fun main() {
    println(make().name)
}

interface Handler {
    fun onStart()
    fun onStop()
}

fun main() {
    val h = object : Handler {
        override fun onStart() = println("start")
        override fun onStop() = println("stop")
    }
    h.onStart()
    h.onStop()
}

object Singleton { val id = 1 }

fun main() {
    val fresh = object { val id = 2 }
    println(Singleton.id)
    println(fresh.id)
}

fun main() {
    val cmp = object : Comparator<Int> {
        override fun compare(a: Int, b: Int) = b - a
    }
    val list = listOf(1, 3, 2).sortedWith(cmp)
    println(list)
}

interface Run { fun go() }

fun main() {
    val r = object : Run { override fun go() = println("go") }
    r.go()
}