Error handling methods in golang

Error handling is very important. In the Go language, error handling is designed to be very simple.

If done well, it will be very helpful in troubleshooting problems; if done poorly, it will be more troublesome.

Starting from 1.0, errors are defined in go as error interface

// The error built-in interface type is the conventional interface for
// representing an error condition, with the nil value representing no error.
type error interface {
    Error() string
}

In go language, there are several ways to handle errors:

1. The judgment values ​​are equal. Like io.EOF, in go language, it is called sentinel error

2. Through assertion (type assertion or type switch), determine the type of err or whether a certain interface is implemented

3. Make use of the methods provided by the package. Like os.IsNotExist. In the go language, it is called ad-hoc check

4. When the above 3 methods are not available, search whether err.Error() contains a specific string. (Not recommended)

Try not to use sentinel error

Try not to use ad-hoc check

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