Is-there an opposite of the `race` operator in RxJS?

Question

I have two observables and I want listen to the one that emits its first value last, is there an operator for this ? Something like that :

let obs1 = Rx.Obse         


        

Answer 1

How about this?

let obs1 = Rx.Observable.timer(500,500);
let obs2 = Rx.Observable.timer(1000,1000);

let sloth = Rx.Observable.race(
    obs1.take(1).concat(obs2),
    obs2.take(1).concat(obs1)
).skip(1);

And as a function with multiple Observables support:

let sloth = (...observables) => 
    observables.length === 1 ?
        observables[0] :
    observables.length === 2 ?
        Rx.Observable.race(
            observables[0].take(1).concat(observables[1]),
            observables[1].take(1).concat(observables[0])
        ).skip(1) :
    observables.reduce((prev, current) => sloth(prev, current))[0];