How to determine error type in golang

How to determine error type:

What is the error type returned in Go? Looking at the source code, we found that the error type is a very simple interface type, as follows

// 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
}

error has a method signed Error() string. All types that implement this interface can be treated as an error type. The Error() method gives a description of the error.
fmt.Println will call the Error() string method internally when printing an error to get a description of the error.

For more golang knowledge, please pay attention to the golang tutorial column.

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