Rxjs - How can I extract multiple values inside an array and feed them back to the observable stream synchronously

Question

I have created a Rx.Observable from a stream of events:

Rx.Observable.fromEvent(recognizeStream, \'data\')

In which every data

Answer 1

Operators flatMap() and concatMap() are both a good choice. You can just turn the alternatives property to another Observable and then emit the array items merged into the stream.

const Observable = Rx.Observable;

Observable.of({ error: null, alternatives: ['result1', 'result2', 'result3'] })
  .concatMap(val => {
    return Observable.from(val['alternatives']);
  })
  .subscribe(val => console.log(val));

This prints to console:

result1
result2
result3

See live demo: https://jsbin.com/foqutab/2/edit?js,console