[NGRX] combineLatest

/*
  Including https://unpkg.com/@reactivex/[email protected]/dist/global/rxjs.umd.js
  in index.html's script tag gives us rxjs globally available under window.rxj
*/
const { Observable, of, combineLatest } = rxjs
const { tap, map, first, takeUntil, catchError } = rxjs.operators

const observableFirst$ = Observable.create((observer) => {
  observer.next(1)
  observer.next(2)
  observer.next(3)
})

const observableSecond$ = Observable.create((observer) => {
  observer.next('a')
  observer.next('b')
  observer.next('c')
})

combineLatest(
  observableFirst$,
  observableSecond$
).subscribe(([numberVal, letterVal]) => {
  console.log('numberVal', numberVal)
  console.log('letterVal', letterVal)
})