Jinseong Jeon
32 lines
607 B
Kotlin
Vendored
32 lines
607 B
Kotlin
Vendored
var sayResult = ""
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class NoiseMaker {
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fun say(str: String) { sayResult += str }
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}
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fun noiseMaker(f: NoiseMaker.() -> Unit) {
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val noiseMaker = NoiseMaker()
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noiseMaker.f()
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}
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abstract class Pet {
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fun <T> NoiseMaker.playWith(friend: T) {
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say("Playing with " + friend)
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}
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abstract fun play(): Unit
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}
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class Doggy(): Pet() {
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override fun play() = noiseMaker {
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say("Time to play! ")
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playWith("my owner!")
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}
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}
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fun box(): String {
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Doggy().play()
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if (sayResult != "Time to play! Playing with my owner!") return "fail: $sayResult"
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return "OK"
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} |