Interview: timeout() guarding a wait

If NEVER doesn't emit within 5ms, catch the timeout and return timeout.

1. Solve the task in the editor — no long theory.
2. Run the check and compare your output with the expected result.
3. Stuck? Open the solution and carry the approach into your own code.

const { NEVER, of, timeout, catchError } = Rx;

const result$ = NEVER.pipe(
  timeout({ first: 5 }),
  catchError(() => of('timeout'))
);

result$.subscribe(value => console.log(value));