Android Livedata Observe Once Only (Kotlin)

ObserveOnceExtension.kt

fun <T> LiveData<T>.observeOnce(lifecycleOwner: LifecycleOwner, observer: Observer<T>) {
    observe(lifecycleOwner, object : Observer<T> {
        override fun onChanged(t: T?) {
            observer.onChanged(t)
            removeObserver(this)
        }
    })
}
//Using
liveData.observeOnce(this, Observer<Password> {
    if (it != null) {
        // do something
    }
})

ObserveOnceSample.kt

val liveData = viewModel.showSnackBar("Hi everyone")
liveData.observe(this, object: Observer<String> {
    override fun onChanged(text: String?) {
        liveData.removeObserver(this)
    }
})