combineLatest with timers

index.js

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

const timerOne = timer(100, 400);
const timerTwo = timer(200, 400);
const timerThree = timer(300, 400);

timerOne.subscribe(rxObserver());
timerTwo.subscribe(rxObserver());
timerThree.subscribe(rxObserver());

combineLatest(timerOne, timerTwo, timerThree, (...arr)=>arr.join('-'))
  .subscribe(rxObserver());