What is setState | Why setState is Asynchronous | What is Batching in React | flushSync() in React

Описание: Are you confused about what setState really does in React?
Or wondering why setState is asynchronous and how React batches multiple state updates?

setState, async updates, and batching are some of the most important and frequently asked React interview topics, yet many developers struggle to explain them clearly.

In this video, we’ll explain setState, asynchronous state updates, and React batching clearly, deeply, and from an interview + internals perspective.

📌 In this video, you’ll learn:
✅ What is setState in React
✅ Why state should never be mutated directly
✅ What does “setState is asynchronous” really mean
✅ Why React delays state updates
✅ What is batching in React
✅ How React batches multiple state updates
✅ setState, batching, and performance optimization
✅ Batching before React 18 vs after React 18
✅ How batching works internally with reconciliation
✅ Interview tips to explain setState & batching confidently

📌 This is Episode 10 of the React Interview Series from Fullstack Diaries — focused on React fundamentals, internals, performance, and interview‑ready concepts.

👨‍💻 Whether you’re a React beginner, frontend developer, or preparing for React interviews, this video will help you build strong fundamentals.

💬 Let’s Connect:
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💡 Don’t Forget To:
👍 Like the video
💬 Comment: What confused you most — setState or batching?
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