1. How do you implement debug-only code in Swift?
Moderate
Debug-only implementation: 1) Using #if DEBUG directive, 2) Debug-only extensions, 3) Conditional compilation, 4) Debug logging setup, 5) Development-time features, 6) Performance impact handling, 7) Debug-only assertions, 8) Testing integrations.
2. How do you debug network issues in Swift applications?
Advanced
Network debugging includes: 1) Charles Proxy integration, 2) URLSession debugging, 3) Network Link Conditioner, 4) Request/response logging, 5) Error pattern analysis, 6) Timeout handling, 7) Connection monitoring, 8) SSL/TLS debugging.
3. How do you implement error middleware in Swift?
Advanced
Error middleware: 1) Error interception, 2) Error transformation chain, 3) Logging middleware, 4) Recovery middleware, 5) Analytics integration, 6) Error filtering, 7) Context enrichment, 8) Error aggregation.
4. What are the strategies for debugging database issues?
Moderate
Database debugging: 1) SQLite debugging tools, 2) Core Data debugging, 3) Migration debugging, 4) Query optimization, 5) Schema validation, 6) Persistence error handling, 7) Data consistency checks, 8) Transaction debugging.
5. What are the different error handling mechanisms in Swift?
Basic
Swift error handling includes: 1) try-catch blocks for throwing functions, 2) Result type for functional error handling, 3) Optional chaining for nil handling, 4) Guard statements for early exits, 5) Assertions for debugging, 6) Error protocol for custom errors, 7) Fatal errors for unrecoverable situations, 8) Optional try (try?) for converting errors to nil.
6. What are the best practices for logging in Swift applications?
Moderate
Logging best practices: 1) Using OSLog for system integration, 2) Implementing log levels, 3) Structured logging format, 4) Performance considerations, 5) Sensitive data handling, 6) Log rotation and storage, 7) Remote logging setup, 8) Debug vs release logging.
7. How do you implement debug-only code in Swift?
Moderate
Debug-only implementation: 1) Using #if DEBUG directive, 2) Debug-only extensions, 3) Conditional compilation, 4) Debug logging setup, 5) Development-time features, 6) Performance impact handling, 7) Debug-only assertions, 8) Testing integrations.
8. How do you debug network issues in Swift applications?
Advanced
Network debugging includes: 1) Charles Proxy integration, 2) URLSession debugging, 3) Network Link Conditioner, 4) Request/response logging, 5) Error pattern analysis, 6) Timeout handling, 7) Connection monitoring, 8) SSL/TLS debugging.
9. What are the best practices for error localization?
Moderate
Error localization practices: 1) LocalizedError implementation, 2) String catalog usage, 3) Error message templates, 4) Dynamic variable substitution, 5) Pluralization handling, 6) Region-specific messages, 7) Fallback messages, 8) Format specifiers.
10. How do you debug performance issues in Swift?
Advanced
Performance debugging: 1) Time Profiler usage, 2) Instruments analysis, 3) Energy logging, 4) Memory allocation tracking, 5) Thread performance, 6) Core Animation debugging, 7) CPU usage analysis, 8) I/O monitoring.
11. How do you handle errors in dependency injection?
Moderate
DI error handling: 1) Resolution errors, 2) Circular dependency detection, 3) Optional dependency handling, 4) Lifecycle errors, 5) Configuration validation, 6) Scope errors, 7) Factory errors, 8) Registration errors.
12. What are the techniques for debugging memory leaks?
Advanced
Memory leak debugging: 1) Instruments leaks tool, 2) Memory graph debugger, 3) Allocation tracking, 4) Retain cycle detection, 5) Heap analysis, 6) Object lifecycle tracking, 7) Autorelease pool debugging, 8) Reference counting analysis.
13. How do you create and use custom Error types in Swift?
Moderate
Custom Error implementation includes: 1) Conforming to Error protocol, 2) Defining error cases with enums, 3) Adding associated values for context, 4) Implementing LocalizedError for messages, 5) Adding custom properties for details, 6) Creating error hierarchies, 7) Handling different error cases, 8) Providing recovery suggestions.
14. How do you handle asynchronous errors in Swift?
Advanced
Async error handling involves: 1) Using async throws functions, 2) Implementing Task error handling, 3) Managing actor isolation errors, 4) Handling concurrent errors, 5) Propagating errors in async sequences, 6) Using async variants of try, 7) Implementing error recovery, 8) Proper cancellation handling.
15. What are the best practices for logging in Swift applications?
Moderate
Logging best practices: 1) Using OSLog for system integration, 2) Implementing log levels, 3) Structured logging format, 4) Performance considerations, 5) Sensitive data handling, 6) Log rotation and storage, 7) Remote logging setup, 8) Debug vs release logging.
16. What are the best practices for error localization?
Moderate
Error localization practices: 1) LocalizedError implementation, 2) String catalog usage, 3) Error message templates, 4) Dynamic variable substitution, 5) Pluralization handling, 6) Region-specific messages, 7) Fallback messages, 8) Format specifiers.
17. What are the best practices for error testing?
Moderate
Error testing practices: 1) Error case coverage, 2) Recovery testing, 3) Async error testing, 4) Mock error injection, 5) Error propagation tests, 6) UI error testing, 7) Performance impact testing, 8) Integration testing.
18. What is the difference between fatalError, assert, and precondition?
Basic
Key differences include: 1) fatalError always terminates, used for unimplemented code, 2) assert only runs in debug builds, 3) precondition runs in debug and -O builds, 4) assert can be disabled, 5) Different message handling, 6) Performance implications, 7) Usage in production code, 8) Integration with debugger.
19. How do you debug memory issues in Swift applications?
Advanced
Memory debugging includes: 1) Using Instruments for leaks, 2) Memory graph debugger usage, 3) Heap debugging tools, 4) Reference cycle detection, 5) Allocation tracking, 6) Virtual memory analysis, 7) Memory pressure testing, 8) Debugging retain cycles.
20. What are the patterns for error propagation in Swift?
Advanced
Error propagation patterns: 1) Using rethrows keyword, 2) Error transformation, 3) Error aggregation, 4) Hierarchical error handling, 5) Context preservation, 6) Chain of responsibility, 7) Middleware error handling, 8) Error recovery strategies.
21. What are the strategies for error recovery in Swift?
Moderate
Error recovery strategies: 1) Retry mechanisms, 2) Fallback values, 3) Graceful degradation, 4) State restoration, 5) User feedback, 6) Automatic recovery, 7) Recovery suggestions, 8) Cleanup operations.
22. How do you implement error boundary patterns?
Moderate
Error boundary patterns: 1) Error containment, 2) Fallback UI, 3) Error recovery UI, 4) State preservation, 5) Error isolation, 6) Component reset, 7) Error reporting, 8) User feedback mechanisms.
23. What are the best practices for error testing?
Moderate
Error testing practices: 1) Error case coverage, 2) Recovery testing, 3) Async error testing, 4) Mock error injection, 5) Error propagation tests, 6) UI error testing, 7) Performance impact testing, 8) Integration testing.
24. What debugging tools are available in Xcode for Swift development?
Moderate
Xcode debugging tools include: 1) LLDB debugger commands, 2) Breakpoints with conditions, 3) Variable inspection and watchpoints, 4) Memory graph debugger, 5) Thread navigator, 6) Console logging, 7) View debugger for UI, 8) Network request debugger.
25. How do you implement error handling with Result type?
Moderate
Result type implementation: 1) Define success/failure cases, 2) Map and flatMap operations, 3) Error type constraints, 4) Converting to throws, 5) Handling async results, 6) Chaining operations, 7) Pattern matching on results, 8) Implementing custom transforms.
26. How do you debug memory issues in Swift applications?
Advanced
Memory debugging includes: 1) Using Instruments for leaks, 2) Memory graph debugger usage, 3) Heap debugging tools, 4) Reference cycle detection, 5) Allocation tracking, 6) Virtual memory analysis, 7) Memory pressure testing, 8) Debugging retain cycles.
27. What debugging techniques are available for SwiftUI?
Moderate
SwiftUI debugging includes: 1) Preview debugging, 2) View hierarchy inspection, 3) State monitoring, 4) Layout debugging, 5) Performance profiling, 6) Animation debugging, 7) Environment value tracking, 8) View modifier debugging.
28. What are the techniques for debugging memory leaks?
Advanced
Memory leak debugging: 1) Instruments leaks tool, 2) Memory graph debugger, 3) Allocation tracking, 4) Retain cycle detection, 5) Heap analysis, 6) Object lifecycle tracking, 7) Autorelease pool debugging, 8) Reference counting analysis.
29. How do you implement error boundary patterns?
Moderate
Error boundary patterns: 1) Error containment, 2) Fallback UI, 3) Error recovery UI, 4) State preservation, 5) Error isolation, 6) Component reset, 7) Error reporting, 8) User feedback mechanisms.
30. How do you handle asynchronous errors in Swift?
Advanced
Async error handling involves: 1) Using async throws functions, 2) Implementing Task error handling, 3) Managing actor isolation errors, 4) Handling concurrent errors, 5) Propagating errors in async sequences, 6) Using async variants of try, 7) Implementing error recovery, 8) Proper cancellation handling.
31. What are the patterns for error handling in async/await code?
Advanced
Async error patterns: 1) Task error handling, 2) Actor isolation errors, 3) Structured concurrency errors, 4) Continuation errors, 5) AsyncSequence errors, 6) Task cancellation, 7) Error propagation, 8) Recovery strategies.
32. What are the strategies for debugging database issues?
Moderate
Database debugging: 1) SQLite debugging tools, 2) Core Data debugging, 3) Migration debugging, 4) Query optimization, 5) Schema validation, 6) Persistence error handling, 7) Data consistency checks, 8) Transaction debugging.
33. What are the different error handling mechanisms in Swift?
Basic
Swift error handling includes: 1) try-catch blocks for throwing functions, 2) Result type for functional error handling, 3) Optional chaining for nil handling, 4) Guard statements for early exits, 5) Assertions for debugging, 6) Error protocol for custom errors, 7) Fatal errors for unrecoverable situations, 8) Optional try (try?) for converting errors to nil.
34. What is the difference between fatalError, assert, and precondition?
Basic
Key differences include: 1) fatalError always terminates, used for unimplemented code, 2) assert only runs in debug builds, 3) precondition runs in debug and -O builds, 4) assert can be disabled, 5) Different message handling, 6) Performance implications, 7) Usage in production code, 8) Integration with debugger.
35. What are the patterns for error propagation in Swift?
Advanced
Error propagation patterns: 1) Using rethrows keyword, 2) Error transformation, 3) Error aggregation, 4) Hierarchical error handling, 5) Context preservation, 6) Chain of responsibility, 7) Middleware error handling, 8) Error recovery strategies.
36. What are the strategies for error recovery in Swift?
Moderate
Error recovery strategies: 1) Retry mechanisms, 2) Fallback values, 3) Graceful degradation, 4) State restoration, 5) User feedback, 6) Automatic recovery, 7) Recovery suggestions, 8) Cleanup operations.
37. What are the techniques for crash reporting in Swift?
Advanced
Crash reporting techniques: 1) Symbolication process, 2) Crash log analysis, 3) Exception handling, 4) Stack trace collection, 5) Debug information format, 6) Third-party integration, 7) User data collection, 8) Privacy considerations.
38. How do you handle validation errors in Swift?
Moderate
Validation error handling: 1) Custom validation rules, 2) Error aggregation, 3) Field-level errors, 4) Error message localization, 5) UI feedback integration, 6) Chain validation, 7) Cross-field validation, 8) Async validation.
39. How do you implement error handling in protocol-oriented code?
Advanced
Protocol error handling: 1) Error type constraints, 2) Protocol error requirements, 3) Default implementations, 4) Generic error handling, 5) Error protocol composition, 6) Associated error types, 7) Error transformation, 8) Protocol extension error handling.
40. How do you debug performance issues in Swift?
Advanced
Performance debugging: 1) Time Profiler usage, 2) Instruments analysis, 3) Energy logging, 4) Memory allocation tracking, 5) Thread performance, 6) Core Animation debugging, 7) CPU usage analysis, 8) I/O monitoring.
41. What are the patterns for error handling in async/await code?
Advanced
Async error patterns: 1) Task error handling, 2) Actor isolation errors, 3) Structured concurrency errors, 4) Continuation errors, 5) AsyncSequence errors, 6) Task cancellation, 7) Error propagation, 8) Recovery strategies.
42. How do you handle errors in dependency injection?
Moderate
DI error handling: 1) Resolution errors, 2) Circular dependency detection, 3) Optional dependency handling, 4) Lifecycle errors, 5) Configuration validation, 6) Scope errors, 7) Factory errors, 8) Registration errors.
43. How do you create and use custom Error types in Swift?
Moderate
Custom Error implementation includes: 1) Conforming to Error protocol, 2) Defining error cases with enums, 3) Adding associated values for context, 4) Implementing LocalizedError for messages, 5) Adding custom properties for details, 6) Creating error hierarchies, 7) Handling different error cases, 8) Providing recovery suggestions.
44. What debugging tools are available in Xcode for Swift development?
Moderate
Xcode debugging tools include: 1) LLDB debugger commands, 2) Breakpoints with conditions, 3) Variable inspection and watchpoints, 4) Memory graph debugger, 5) Thread navigator, 6) Console logging, 7) View debugger for UI, 8) Network request debugger.
45. How do you implement error handling with Result type?
Moderate
Result type implementation: 1) Define success/failure cases, 2) Map and flatMap operations, 3) Error type constraints, 4) Converting to throws, 5) Handling async results, 6) Chaining operations, 7) Pattern matching on results, 8) Implementing custom transforms.
46. What are the techniques for crash reporting in Swift?
Advanced
Crash reporting techniques: 1) Symbolication process, 2) Crash log analysis, 3) Exception handling, 4) Stack trace collection, 5) Debug information format, 6) Third-party integration, 7) User data collection, 8) Privacy considerations.
47. How do you handle validation errors in Swift?
Moderate
Validation error handling: 1) Custom validation rules, 2) Error aggregation, 3) Field-level errors, 4) Error message localization, 5) UI feedback integration, 6) Chain validation, 7) Cross-field validation, 8) Async validation.
48. What debugging techniques are available for SwiftUI?
Moderate
SwiftUI debugging includes: 1) Preview debugging, 2) View hierarchy inspection, 3) State monitoring, 4) Layout debugging, 5) Performance profiling, 6) Animation debugging, 7) Environment value tracking, 8) View modifier debugging.
49. How do you implement error handling in protocol-oriented code?
Advanced
Protocol error handling: 1) Error type constraints, 2) Protocol error requirements, 3) Default implementations, 4) Generic error handling, 5) Error protocol composition, 6) Associated error types, 7) Error transformation, 8) Protocol extension error handling.
50. How do you implement error middleware in Swift?
Advanced
Error middleware: 1) Error interception, 2) Error transformation chain, 3) Logging middleware, 4) Recovery middleware, 5) Analytics integration, 6) Error filtering, 7) Context enrichment, 8) Error aggregation.
