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// For this example, we are shopping for a Car based on the CarManufacturer
interface CarManufacturer {
}

final class HondaMotor implements CarManufacturer {
}

final class BMWGroup implements CarManufacturer {
}

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object Earth { }

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class Mars {

    // Declare private static member variable as `final` to inform the
    // compiler that this value will never change.
    private static final Mars SINGLETON_INSTANCE = new Mars();

    // Make the constructor private to avoid any other instances of this class
    // From being created.
    private Mars() {

ericdiazcodes

class Earth {

    // Have a private and static member variable to hold the singleton instance.
    private static Earth SINGLETON_INSTANCE;

    // Make the constructor private to avoid any other instances of this class
    // From being created.
    private Earth() {
    }

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fun ConstraintLayout.updateConstraints(instructions: List<ConstraintInstructions>) {
    ConstraintSet().also {
        it.clone(this)
        for (instruction in instructions) {
            if (instruction is ConnectConstraint) it.connect(instruction.startID, instruction.startSide, instruction.endID, instruction.endSide)
            if (instruction is DisconnectConstraint) it.clear(instruction.startID, instruction.startSide)
        }
        it.applyTo(this)
    }
}

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ConnectConstraint(R.id.image, ConstraintSet.Top, R.id.title, ConstraintSet.BOTTOM)

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        <TextView
            android:id="@+id/title"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"/>

        <ImageView
            android:id="@+id/image"

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interface ConstraintInstructions
data class ConnectConstraint(val startID: Int, val startSide: Int, val endID: Int, val endSide: Int) : ConstraintInstructions
data class DisconnectConstraint(val startID: Int, val startSide: Int) : ConstraintInstructions