code4.kt

fun <T> Observable<T>.debounceIf(
    predicate: (T) -> Boolean,
    timeout: Long,
    unit: TimeUnit,
    scheduler: Scheduler
): Observable<T> {
    return Observable.merge(
        debounce(timeout, unit, scheduler)
            .filter { predicate(it) },
        filter { !predicate(it) }
    )
}