Simple rxified Clock

Clock.jsx

const { interval, empty } = require('rxjs');
const { switchMap, startWith, map } = require('rxjs/operators');

const Clock = rxify((initialProps, prop$) => {
  return prop$
    .pipe(
      switchMap(props => props.running ? interval(0, 1000) : empty()),
      startWith(1),
      map(_ => (<span className="time">{new Date().toLocaleTimeString()}</span>))
    )
});