[Golang] Why You Should Use errors.As Instead of Type Assertions err.(*MyError)
Introduction Go 1.13 introduced powerful features for error wrapping and introspection — namely errors.Is and errors.As. While it’s tempting to reach for traditional type assertions (e.g., err.(*MyError)), there’s a safer and more idiomatic tool for the job: errors.As. This post explains why you should use errors.As over type assertions, with clear examples for both concrete error structs and interfaces like net.Error. The Problem with Type Assertions Consider the old way of checking if an error is of a specific type: ...
