Common error handling issues in golang functions

Common mistakes when handling function errors in Go are unhandled errors, ignoring specific errors, and catching multiple errors. To handle errors correctly, you should always handle error values ​​that may be returned by functions, use the errors.Is function to handle specific types of errors, and define custom error types or use the errors.New function to create error values ​​to catch multiple errors.

Common error handling issues in functions in Go

In Go, error values ​​are used to indicate errors encountered during function execution. The problem. However, when it comes to handling errors, there are several common mistakes that can make code difficult to maintain and debug.

1. Unhandled errors

Unhandled errors will trigger a panic when the program is running, causing the program to exit. To avoid this, always handle incorrect values ​​that may be returned by functions.

2. Ignore specific errors

Sometimes, you may only care about specific types of errors. In this case, you can use the errors.Is function as follows:

if errors.Is(err, myError) {
    // 处理 myError 特定的情况
}

3. Catching Multiple Errors

in Go , the errors.New function can create error values, but it only accepts a single string parameter. To catch multiple errors, you can use the following method:

type MyErrors []error

func (me MyErrors) Error() string {
    var errStr string
    for _, err := range me {
        errStr += err.Error() + "\n"
    }
    return errStr
}

Practical case: file reading

Here is an example of reading a file using the given function:

func readFile(filename string) ([]byte, error) {
    data, err := os.ReadFile(filename)
    if err != nil {
        return nil, fmt.Errorf("error reading file: %w", err)
    }
    return data, nil
}

This function handles potential file read errors and provides additional contextual information as needed.

Other Tips

• Using custom error types can provide richer error information.
• Return an error value containing a pointer to the underlying error for more detailed information when debugging.
• Consider using error handling middleware to simplify error handling.

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