1. Debugging Tools and Techniques

Developing and shipping an app requires mastering both internal diagnostic tools and external platform-specific requirements.
 
Debugging Tools and Techniques
Debugging is the process of identifying and fixing the root cause of issues identified during testing.
 
Core Debugging Tools
  • Integrated Development Environments (IDEs):
    1. Xcode (iOS): Includes the LLDB debugger, UI inspection tools, and memory graph debugging to track leaks.
    2. Android Studio (Android): Features Logcat for viewing system output and a built-in debugger for inspecting variables and CPU/memory usage.
    3. Visual Studio Code: A popular cross-platform editor with robust debugging extensions for many languages.
  • Network & API Inspection: Tools like Charles Proxy or Proxyman allow you to view and manipulate HTTP/HTTPS traffic between your app and the backend.
  • Crash Reporting & Monitoring: Services like Firebase Crashlytics and Sentry provide real-time crash data, stack traces, and device info from production.
 
Essential Techniques
  • Breakpoints: Pause code execution at specific lines to inspect the program state and variable values in real-time.
  • Logging: Strategically placing log statements (e.g., Logcat for Android, OSLog for iOS) to track execution flow. Tip: Remove or mask sensitive data before production.
  • Binary Search Debugging: Ruling out large chunks of code by placing breakpoints at key mid-points to narrow down where a bug is hiding.
  • Version Control Reversion: Using tools like git bisect to automate finding the specific code change (commit) that introduced a bug.