RxJS: concat three promises, distinguish results

Question

I have three promises, Rest requests returning lists of data.
The third one has references (ids) to the first two lists, so I want to map these ids to corresponding name

Answer 1

If these are promises we are talking about, I think you can have a look at the forkJoin operator. Cf. https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/core/operators/forkjoin.md, http://xgrommx.github.io/rx-book/content/observable/observable_methods/forkjoin.html

You could then have something like :

Rx.Observable.forkJoin(p1, p2, p3, function(p1,p2,p3){
/* your combining code here */
})

In short, forkJoin has semantics similar to that of RSVP.all if you know the promises library RSVP.