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.
No comments:
Post a Comment