error-handling-go

To handle Go errors consistently, wrap them with context and maintain lowercased messages across packages. This ensures reliable error propagation and makes debugging easier throughout your project.

Use errors.Is to check if an error matches a specific sentinel error, and use errors.As to extract a typed error for programmatic access. These standard library functions ensure accurate error identification and data extraction during propagation.

The best way to wrap Go errors is using the standard library's fmt.Errorf function with the %w verb. This preserves the original error chain, allowing errors.Is and errors.As to inspect underlying causes accurately.

Review Go error handling by verifying that errors are wrapped with clear context and that errors.Is and errors.As are used correctly for sentinels and typed errors. Test by asserting specific error behaviors rather than matching string messages.

Sentinel errors in Go are predefined error variables that represent specific stop conditions. You implement them as exported package variables and check them using errors.Is to identify exact error matches during execution.