What methods or tools do you use to detect and diagnose errors in code or systems?

To detect and diagnose errors in Go, I usually use several approaches:

• Logging with the standard log package or more advanced libraries (e.g., zap, logrus). Logs help understand where and why an error occurred.
• Panic and recover to catch unexpected runtime failures.
• Debugger Delve (dlv) — allows step-by-step execution of the program, viewing variable values and call stack.
• Error-checking tests — writing unit tests that verify returned errors helps identify issues early.
• Profiling and tracing (pprof) — for performance diagnostics and bottleneck identification.

Example of using Delve:

# Running the program with the debugger
dlv debug main.go

# In interactive mode, you can set breakpoints, view variables
(dlv) break main.main
(dlv) run
(dlv) print myVar

This comprehensive approach helps quickly find and fix errors.