Create RxObservable with interval

RxObservableInterval.swift

func createRxObservable() {
    let source: Observable<Int> = Observable.interval(1, scheduler: ConcurrentDispatchQueueScheduler.init(qos: DispatchQoS.background)).take(3)
        source
        .subscribe(onNext: { number in
            print("Second: ", number)
        }, onError: { _ in print("On Error") },
           onCompleted: { print("Complete") },
           onDisposed: nil)
}