An Either class

Either.kt

sealed class Either<L> {
    class Success<L>(val value: L) : Either<L>()
    class Error<L>(val title: String, val message: String) : Either<L>()
    fun success(success: L.() -> Unit) {
        if (this is Success<L>) success(value)
    }
    fun error(error: (Error<L>).() -> Unit) {
        if (this is Error<L>) error(this)
    }
}

inline fun <T> LiveData<T>.observeEither(
    owner: LifecycleOwner,
    crossinline either: T.() -> Unit
) {
    observeNullSafe(owner, either)
}

inline fun <T> LiveData<T>.observeNullSafe(
    owner: LifecycleOwner,
    crossinline observer: (T) -> Unit
) {
    observe(owner, Observer { nullableValue ->
        nullableValue?.also {
            observer(it)
        }
    })
}