Function count

count(options?: Partial<CountOptions>): ReactiveStream<number>

Produces an incrementing value. By default starts at 0 and counts forever, incrementing every second.

const r = Rx.From.count();
r.onValue(c => {
 // 0, 1, 2, 3 ... every second
});

The limit is exclusive

const r = Rx.From.count({limit:5});
// Yields 0,1,2,3,4

If limit is less than start, it will count down instead.

const r = Rx.count({start:5, limit: 0});
// Yie:ds 5,4,3,2,1

// Count 10, 12, 14 ... every 500ms
const r = Rx.From.count({ start: 10, amount: 2, interval: 500 });

In addition to setting limit (which is exclusive), you can stop with an abort signal

const ac = new AbortController();
const r = Rx.From.count({signal:ac.signal});
...
ac.abort(`stop`);