fun <T : Node> T.removeWhen(expr: () -> ObservableValue<Boolean>): T
This extension function will make sure that the given node will only be visible in the scene graph, if the given expr returning an observable boolean value equals true.
fun <T : Node> T.removeWhen(predicate: ObservableValue<Boolean>): <ERROR CLASS>
This extension function will make sure that the given node will only be visible in the scene graph, if the given predicate observable boolean value equals true.