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class MusicPlayerFacade {
    private val player = MediaPlayer()
    private val playlist = Playlist()

    fun play(song: Song) {
        playlist.clear()
        playlist.addSong(song)
        player.reset()
        player.setDataSource(song.filePath)
        player.prepare()

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class SubsystemA {
    fun operationA() {
        // implementation
    }
}

class SubsystemB {
    fun operationB() {
        // implementation
    }

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interface Coffee {
    fun cost(): Double
    fun ingredients(): String
}

class Espresso : Coffee {
    override fun cost() = 2.0

    override fun ingredients() = "Espresso"
}

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interface Component {
    fun operation()
}

class ConcreteComponent : Component {
    override fun operation() {
        // implementation
    }
}

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{
        "data": [
            {
                "type": "SCAFFOLD",
                "top_bar": [
                    {
                        "type": "APP_BAR",
                        "children": [
                            {
                                "type": "EDIT_TEXT",

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interface ViewComponent {
    fun draw()
}

class TextView : ViewComponent {
    override fun draw() {
        // Draw text view on screen
    }
}

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interface Component {
    fun operation()
}

class Leaf : Component {
    override fun operation() {
        // implementation
    }
}

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interface NetworkAPI {
    fun sendData(data: String)
}

class HTTPAPI : NetworkAPI {
    override fun sendData(data: String) {
        // send data over HTTP
    }
}

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interface Implementor {
    fun operationImplementation()
}

class ConcreteImplementorA : Implementor {
    override fun operationImplementation() {
        // implementation
    }
}

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interface Implementor {
    fun operationImplementation()
}

class ConcreteImplementorA : Implementor {
    override fun operationImplementation() {
        // implementation
    }
}