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forkJoin creates an Observable from multiple Observables.
Resulting stream waits for all input streams to complete, then combines and emits their latest values

const { rxObserver } = require('api/v0.3');
const { timer, forkJoin } = require('rxjs');
const { mapTo, take } = require('rxjs/operators');

const a$ = timer(10).pipe(mapTo('a'));
const b$ = timer(5, 5).pipe(take(3));

const result$ = forkJoin([ a$, b$ ]);

result$.subscribe(rxObserver('forkJoin(a$, b$)'));
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