1. What are error boundaries in Angular?
Advanced
Error boundaries through component error handlers, ngOnError hook. Catch and handle rendering errors. Implement fallback UI, error recovery. Consider component hierarchy.
2. What are error recovery patterns?
Advanced
Recovery patterns: retry logic, fallback options, graceful degradation. Implement automatic recovery, manual intervention. Consider user experience, data integrity.
3. What are error serialization strategies?
Moderate
Error serialization for logging, transmission. Implement proper error format, data extraction. Consider sensitive information, error context.
4. How do you handle offline errors?
Advanced
Offline errors through connection checking, retry logic. Implement offline storage, sync mechanisms. Consider network conditions, data persistence.
5. What are error reporting best practices?
Moderate
Reporting practices: proper error format, context inclusion, aggregation. Implement error categorization, priority handling. Consider privacy, compliance requirements.
6. How do you implement error logging services?
Moderate
Error logging through centralized service. Log error details, stack traces. Implement remote logging, error tracking. Consider privacy, performance impact.
7. How do you handle async operation errors?
Moderate
Async errors through Promise catch, Observable error handling. Implement proper error propagation, recovery. Consider loading states, timeout handling.
8. How do you handle route navigation errors?
Moderate
Navigation errors through Router error events, guards. Implement redirection, error pages. Consider route parameters, navigation history.
9. How do you implement error tracking?
Moderate
Error tracking through monitoring services, custom tracking. Implement error aggregation, analysis. Consider error patterns, impact assessment.
10. What are error prevention strategies?
Moderate
Prevention strategies: input validation, type checking, defensive programming. Implement proper error boundaries, testing. Consider edge cases, error scenarios.
11. What are error testing strategies?
Moderate
Error testing through unit tests, integration tests. Test error scenarios, recovery logic. Consider error simulation, boundary testing.
12. What are error handling anti-patterns?
Moderate
Anti-patterns: swallowing errors, generic error messages, missing logging. Avoid broad catch blocks, silent failures. Consider proper error handling practices.
13. What are error handling metrics?
Moderate
Error metrics: error rates, recovery times, impact assessment. Implement metric collection, analysis. Consider monitoring, alerting thresholds.
14. How do you handle dependency injection errors?
Advanced
DI errors through proper provider configuration, error catching. Implement fallback providers, error messages. Consider circular dependencies, missing providers.
15. What is the global error handling mechanism in Angular?
Basic
Global error handling through ErrorHandler class. Override handleError method for custom handling. Catches all unhandled errors. Implement logging, user notification, error reporting.
16. How do you handle HTTP errors in Angular?
Moderate
HTTP errors handled through interceptors, catchError operator. Implement retry logic, error transformation. Use error handling services. Consider different error types, user feedback.
17. How do you implement form validation error handling?
Moderate
Form errors through validators, error states. Display validation messages, highlight errors. Implement custom validators, async validation. Consider user experience, feedback timing.
18. What are RxJS error handling operators?
Advanced
RxJS operators: catchError, retry, retryWhen, throwError. Handle stream errors, implement recovery logic. Consider error transformation, retry strategies.
19. What are the best practices for error handling?
Moderate
Best practices: centralized handling, proper error types, user feedback. Implement logging, monitoring. Consider error recovery, graceful degradation.
20. How do you handle third-party library errors?
Advanced
Library errors through error wrapping, custom handlers. Implement proper integration, error transformation. Consider library updates, compatibility issues.
21. How do you handle production errors?
Advanced
Production errors through logging, monitoring, alerts. Implement error reporting, analysis. Consider environment differences, security implications.
22. How do you handle state management errors?
Advanced
State errors through error actions, error states. Implement state recovery, rollback mechanisms. Consider state consistency, error propagation.
23. How do you handle security-related errors?
Advanced
Security errors through proper validation, authorization checks. Implement secure error messages, logging. Consider sensitive information, attack vectors.
24. What are error documentation practices?
Moderate
Documentation practices: error codes, handling procedures, recovery steps. Implement proper error guides, troubleshooting docs. Consider user/developer documentation.
25. How do you handle performance-related errors?
Advanced
Performance errors through monitoring, optimization. Implement performance boundaries, error tracking. Consider resource usage, user experience impact.
26. What are error notification strategies?
Basic
Error notifications through toasts, alerts, error pages. Implement user-friendly messages, action options. Consider error severity, context-appropriate feedback.
27. How do you handle memory leaks?
Advanced
Memory leak prevention through proper unsubscription, cleanup. Implement resource management, leak detection. Consider component lifecycle, subscription handling.
28. What are error monitoring tools?
Moderate
Monitoring tools: Sentry, LogRocket, custom solutions. Implement error tracking, performance monitoring. Consider tool integration, configuration.
29. What are error boundary patterns?
Advanced
Boundary patterns: component-level, route-level, app-level boundaries. Implement proper error isolation, recovery. Consider error propagation, UI feedback.
30. How do you handle initialization errors?
Advanced
Initialization errors through APP_INITIALIZER, bootstrap handling. Implement proper startup checks, fallbacks. Consider application requirements, dependencies.
