Shulou(Shulou.com)05/31 Report--

In this issue, the editor will bring you about how to use error in Go language. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

1. Error introduction

Error is actually an interface that implements the Error () function. The returned value nil indicates that it is successful. The example is as follows:

Output:

Result analysis: because there is no go.txt file, when you try to open the file, it will return the error message "the file does not exist" non-nil information. Note: Println can print error messages because the Println function calls the Error () function in error. )

two。 Custom error

2.1. Customize the error message through New ()

The function New () is implemented in Go's errors package, so we can directly use the New () function to define the error output we want, as shown in the following example:

With the above implementation, we can customize the error message, as shown in the following example:

Result analysis: by outputting the results, we can see that our custom error message "error: custom error message!!" It can be printed successfully.

2.2. Error more content with the help of struct

We can use struct to implement the error interface, and then achieve the way to implement custom error messages. Examples are as follows:

Result analysis: through the output results, we can see that our custom error codes and error messages can be printed out. This means that if we want to extend other information about error, we can use struct to add different attributes to implement it.

This is how error is used in the Goe language shared by the editor. If you happen to have similar doubts, please refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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