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


const a$ = timer(0, 10).pipe(
    take(5)
  );

const b$ = timer(0, 4).pipe(
    take(7)
  );

const c$ =timer(0, 10).pipe(take(5), filter(() => false))
const result$ = combineLatest(a$, b$, c$);

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