Verify the fix by running your reproduction steps again, ensuring the bug is gone and no new regressions have been introduced. 4. Essential Debugging Techniques
Bugs love messy environments. If an application fails on your machine but works for a colleague, clean your dependencies. Delete local caches, wipe your node_modules directory, rebuild your Docker containers, or re-clone the repository to establish a clean baseline. 7. Moving From Reactive Debugging to Proactive Prevention
Scan source code before it runs to find anti-patterns, security vulnerabilities, or formatting problems. Verify the fix by running your reproduction steps
When a program crashes in production, you don't get a debugger. You get a core dump—a snapshot of the program's memory at the moment of death. Learning to analyze a core dump with tools like gdb , lldb , or windbg allows you to debug a failure after it has already happened, without reproducing the issue live.
: A framework (Debug2) designed to find bugs within the production toolchains and debuggers themselves. If an application fails on your machine but
What are you trying to resolve right now?
[ Fault / Root Cause ] --> [ Error / Invalid State ] --> [ Failure / Symptom ] (Code Mistake) (Hidden Miscalculation) (Crash or Bad Output) Moving From Reactive Debugging to Proactive Prevention Scan
Small, single-responsibility functions are easier to reason about, test, and isolate during a failure.
: Confirm that the bug exists and can be triggered consistently. Isolate the cause