Creating Observables with timer()

timer.ts

import { timer } from "rxjs";

// Observable will emit one value (0) after 2s and complete
const onlyOneValue$ = timer(2000);

// Observable will wait 5s, then start emitting values every second
const number$ = timer(5000, 1000);


onlyOneValue$.subscribe(console.log);
// Output: 0

number$.subscribe(number => console.log(number));
// Output: 0, 1, 2, 3...