How does golang return error information?

Returning error information in Go: Use the error type to represent error information. Use errors.New() to create simple error messages. Use fmt.Errorf() to create detailed error messages. Errors are caught via if err != nil and handled via fmt.Println(err).

Returning error information in Go

In Go, you can use theerrortype to represent error information . The following code shows how to return an error message:

func myFunc() error { // 出现错误时，使用 errors.New() 创建错误并返回 return errors.New("some error occurred") }

You can also create a more detailed error message using thefmt.Errorf()function:

func myFunc() error { return fmt.Errorf("some error occurred: %v", someVariable) }

Capture and handle errors Information:

func main() { err := myFunc() if err != nil { // 处理错误 fmt.Println(err) } }

Practical case:

In the following example, we return an error in the function and capture it in themainfunction Handle it:

func readFile(filename string) error { file, err := os.Open(filename) if err != nil { return err } defer file.Close() // ... return nil } func main() { err := readFile("non-existent-file.txt") if err != nil { fmt.Println(err) } }

This way you can handle and communicate the error gracefully to the user.

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