Web Reference: When you need to handle multiple types of optimistic updates (like adding and removing items), use a reducer pattern with action objects. This shopping cart example shows how to handle add and remove with a single reducer: In this video, we dive into optimistic updates in React 19 and learn how they differ from the normal update flow. Dec 12, 2025 · Optimistic UI (also known as optimistic updates) is a pattern that helps you update the UI immediately, assuming the server operation will succeed, and if it later fails, you roll back the UI to the correct state.
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