Function useLatest

Subscribe to a live source and return only the latest event.

Many dashboard stats only need the most recent value — current CPU, latest count, last price. Building a full TimeSeries snapshot for a single event is wasteful. useLatest returns just the last event, throttled like useSnapshot:

const latest = useLatest(live);
// latest?.get('cpu')  → number
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Returns null when the source is empty or null.