errext

func As ¶

func As[T error](err error) (T, bool)

As is a variant of errors.As() that leverages generics to present a nicer interface.

//this code:
var perr os.PathError
if errors.As(err, &perr) {
	handle(perr)
}
//can be rewritten as:
if perr, ok := errext.As[os.PathError](err); ok {
	handle(perr)
}

This is sometimes more verbose (like in this example), but allows to scope the specific error variable to the condition's then-branch, and also looks more idiomatic to developers already familiar with type casts.

func IsOfType ¶

func IsOfType[T error](err error) bool

IsOfType is a variant of errors.As() that only returns whether the match succeeded.

This function is not called Is() to avoid confusion with errors.Is(), which works differently.