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Code Review: Fix: Add Error Handling for Async Calls in ExerciseDetail.js

Overview

This PR adds comprehensive error handling for asynchronous API calls in the ExerciseDetail component and fetchData utility. The changes significantly improve the application's robustness and user experience.

Changes in fetchData.js

• Line 17-21: Great addition of proper error handling with HTTP status code checking using response.ok. This is essential for catching server errors that return valid HTTP responses but with error status codes.
• Line 26-28: Good practice to log the error with the URL for easier debugging, and re-throwing the error to allow component-level handling. This creates a clear separation of concerns.

Changes in ExcerciseDetail.js

• Line 15-16: Good addition of loading and error state management. These are essential for providing proper feedback to users during asynchronous operations.
• Line 33-40: Nice implementation of nested try/catch blocks for each API call. This ensures that if one API call fails, the others can still proceed, providing a graceful degradation of functionality.
• Line 35: The fallback to an empty array with exerciseVideoData.contents || [] is a good defensive programming practice to handle potential undefined values.
• Line 75-97: The error UI with a retry button provides a good user experience. Users are informed about the error and given a way to recover.
• Line 108: Fixed the spacing issue in the SimilarExercises component props. Good catch!

Strengths

• Layered Error Handling: Good separation between network-level errors (in fetchData.js) and UI-level error handling (in ExerciseDetail.js)
• Graceful Degradation: If one API call fails, others can still succeed, preventing total component failure
• User Experience: Clear error messages and retry functionality give users a way to recover from errors
• Loading State Management: Proper loading state handling improves user experience during data fetching
• Defensive Programming: Fallbacks to empty arrays when API calls fail prevent rendering issues

Suggestions for Future Improvements

1. Consider extracting the data fetching logic into a custom hook to reduce code duplication for similar components
2. The error messages could be more specific about which part of the data fetching failed
3. Consider adding a timeout for fetch requests to handle cases where the API never responds

Conclusion

This is a well-implemented solution that significantly improves the application's error handling capabilities. The changes address the issue described in #19 and make the application more robust against API failures. Approving this PR.