Go Expert — Gotchas & Decisions

Use Context7 for Go framework docs.

Key Decisions

decisions[4]{choice,use_when}:
  Gin vs Echo vs Fiber,"Gin: most popular/stable. Echo: cleaner API. Fiber: highest perf (Express-like)"
  Interface location,"Define in CONSUMER package not provider. Accept interfaces return structs"
  Channel vs Mutex,"Channel for communication between goroutines. Mutex for protecting shared memory"
  Table-driven vs subtests,"Table-driven for input variations. Subtests (t.Run) for distinct scenarios"

Gotchas

• err != nil check EVERY error return — never ignore with _
• %w for wrapping errors (unwrappable), %v for formatting only (not unwrappable)
• Goroutine leak: always ensure goroutines can exit (context cancellation, done channels)