The more straightforward alternative for emulating Promise.all
is to use the forkJoin
operator (it starts all observables in parallel and join their last elements):
- documentation
- related link: Cf. RxJS: concat three promises, distinguish results
A bit out of scope, but in case it helps, on the subject of chaining promises, you can use a simple flatMap
: Cf. RxJS Promise Composition (passing data)