How to get a Promise like pattern with subscription in RxJS?

Question

I am trying to figure out if the following is possible with any of the existing operators in RxJS, or if I need to roll my own extension:

var x = // some observable sequence 
var y = // some observable sequence 
var z = // some observable sequence 

// 'when' should only call onNext when all of x, y and z has returned at 
// least one value. After that, 'when' should continue to call onNext if
// any of x, y, z changes their value.
var w = Rx.Observable.when(x, y, z).select(function(x, y, z) {
    // do stuff values of from z, y, x.
});

Best, Egil.

Answer 1

Looks like I figured it out myself :)

The combineLatest instance function does exactly what I need.