Incrementing Values Atomically with Cloud Firestore

Cloud Firestore introduced the `FieldValue.increment` operation, allowing applications to atomically increase or decrease numeric document fields directly on the server without requiring a transaction for simple counter updates. The feature prevents concurrent writes from overwriting one another, such as when multiple users add step totals to a shared fitness-team counter at the same time, and it also works in situations where transactions are less suitable, including offline use. Transactions remain necessary when updates require conditional logic, such as enforcing minimum or maximum values. Developers should also account for Firestore’s sustained limit of one write per second per document and use distributed counters for more frequently updated values.

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