Errors

Go Error Wrapping with errors.Is and errors.As

Errors often cross several layers of a Go application. A low-level function may know that a file is missing, while a higher-level function needs to add context about which operation failed. Go error wrapping lets you add that context without losing information callers need for reliable handling. Error strings are a fragile interface Do not make program logic depend on error wording. Adding a filename or changing punctuation can break string comparisons even when the underlying condition is unchanged. Prefer semantic checks: