检查对fmt.Errorf（）的调用是否失败[关闭]

Question

In Go, the function fmt.Errorf() returns an error interface.
What's the proper way to check if fmt.Errorf() itself failed?

Answer 1

Errorf formats according to a format specifier and returns the string as a value that satisfies error. The fmt package's Errorf function lets us use the package's formatting features to create descriptive error messages.

func Errorf(format string, a ...interface{}) error {
    return errors.New(Sprintf(format, a...))
}

And New returns an error that formats as the given text.

func New(text string) error {
    return &errorString{text}
}

And errorString is a trivial implementation of error.

type errorString struct {
    s string
}

So Basically what it is returning is field of string type.