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Mastering Asynchronous JavaScript Callbacks, Promises, and Async, Await for Cleaner React Components
- Asynchronous JavaScript is crucial in React for handling delays and ensuring a smooth user experience.
- Callbacks were the original way to manage async logic before Promises and async/await.
- Callbacks involve passing functions into other functions to be executed later, leading to callback hell with deeply nested functions.
- Promises provide a cleaner way to handle async code, featuring states like pending, fulfilled, and rejected, allowing for chaining with .then() and error handling with .catch().
- Async/await simplifies async coding, making it read like synchronous code, using await to pause a function until a Promise resolves and try/catch for error handling.
- Best practices for using async logic in React components include avoiding using async directly in useEffect, cleaning up async calls on unmount, and utilizing useEffect for async side effects.
- Real-world examples showcase handling API requests with fetch(), managing loading states and errors, and ensuring cleanup of side effects.
- Key takeaways include handling loading and errors, using AbortController to prevent side effects, and wrapping API calls in try-catch-finally for reliable code.
- The importance of showing loading and error states, cleaning up requests, and writing fetch logic that works is highlighted in the key takeaways.
- Writing clean async logic in React involves focusing on basics like handling loading, error states, and cleanup to ensure a reliable UI.
- Starting with plain fetch(), understanding the problem, and solving it cleanly can lead to good code, and additional tools can be used as complexity grows.
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