Rxswift: Waiting for two observables to complete

[gaudecker]

I have this problem where I need to listen to the complete-events of two observables and do something when both are complete.

func fetchA() -> Observable<A> {}
func fetchB() -> Observable<B> {}

let a = fetchA();
let b = fetchB();

waitForBoth(a, b).subscribeCompleted {
    // Do stuff now that both have finished
}

Is there any operator or function that does this?

[ertrzyiks]

If you are just interested in completed event, you can use any of Combining operators, for example zip

let fetch1 = [7].toObservable()
let fetch2 = [12].toObservable()

Observable
    .zip(fetch1, fetch2) { (a, b) throws -> Int in
        print("\(a), \(b)") //7, 12
        return 0
    }
    .subscribeCompleted { print("Done") }

You can choose a proper method depending on what do you want to do with data from fetchA and fetchB.

[gaudecker]

That'll do, thanks!

[andrewarrow]

is there a way to make zip take an array of Observables vs just two hard coded Observables?