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Wednesday, May 14, 2025

what is the difference between react17 and react 18?

 

React 18 introduced several improvements over React 17, focusing on performance, concurrent rendering, and developer experience. Here are the key differences:



1. Concurrent Rendering

  • React 17: Used a synchronous rendering model, meaning updates were processed one at a time.
  • React 18: Introduced concurrent rendering, allowing React to pause and resume rendering tasks, improving responsiveness.

2. Automatic Batching

  • React 17: Only batched state updates inside event handlers.
  • React 18: Automatically batches updates across asynchronous functions, reducing unnecessary re-renders.

3. New Root API

  • React 17: Used ReactDOM.render().
  • React 18: Introduced createRoot(), improving rendering performance and enabling concurrent features.

4. Suspense for Data Fetching

  • React 17: Suspense was limited to code splitting.
  • React 18: Expanded Suspense to support data fetching, making it easier to handle asynchronous operations.

5. Improved Server-Side Rendering (SSR)

  • React 17: SSR was synchronous.
  • React 18: Introduced streaming SSR, allowing components to be progressively sent to the client, improving load times.

6. New APIs

  • React 18: Added startTransition(), allowing developers to prioritize updates for smoother UI interactions.

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