share-and-initial-value.swift

   let hotdogProperty = BehaviorSubject<String>(value: "")
    Observable<Int>
        .interval(1.0, scheduler: ConcurrentMainScheduler.instance)
        .map { "Nice \($0)" }
        .startWith("bonapetit!")
        .debug("[source]")
        .subscribe(onNext: { hotdogProperty.onNext($0) })

    func hotdogObservable() -> Observable<String> {
        return hotdogProperty.asObservable()
            .share()
            .flatMap { Observable.just($0) }
            .map { $0 }
            .share()
    }
    func hotdogObservable2() -> Observable<String> {
        return hotdogObservable()
    }

    hotdogObservable2().debug("tom eats lunch")
        .subscribeOn(ConcurrentDispatchQueueScheduler(qos: .default))
        .delaySubscription(0.5, scheduler: ConcurrentMainScheduler.instance)
        .observeOn(ConcurrentDispatchQueueScheduler(qos: .default))
        .subscribe()

    hotdogObservable2().debug("mary eats lunch")
        .subscribe()