How to make one Observable sequence wait for another to complete before emitting?

Question

Say I have an Observable, like so:

var one = someObservable.take(1);  one.subscribe(function(){ /* do something */ }); 

Then, I have a second Observable:

var two = someOtherObservable.take(1); 

Now, I want to subscribe() to two, but I want to make sure that one has completed before the two subscriber is fired.

What kind of buffering method can I use on two to make the second one wait for the first one to be completed?

I suppose I am looking to pause two until one is complete.

Answer 1

A couple ways I can think of

import {take, publish} from 'rxjs/operators' import {concat} from 'rxjs'  //Method one  var one = someObservable.pipe(take(1)); var two = someOtherObservable.pipe(take(1)); concat(one, two).subscribe(function() {/*do something */});  //Method two, if they need to be separate for some reason var one = someObservable.pipe(take(1)); var two = someOtherObservable.pipe(take(1), publish()); two.subscribe(function(){/*do something */}); one.subscribe(function(){/*do something */}, null, two.connect.bind(two));