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How can React update the UI BEFORE the API response even finishes? 😳
In this React 19 tutorial, we build a real Follow/Unfollow feature using useOptimistic() and see exactly how optimistic UI works with the frontend, API, and backend data.
We first test what happens when you click Follow in a real application. Then we break down what is actually happening behind the scenes:
Click Follow → UI updates instantly ⚡ → API runs → Success = keep it / Failure = revert
In this video you'll understan...
