What is the role of error handling in software applications?

Error handling in software applications plays a key role in ensuring system reliability and stability. It allows:

• To prevent the program from crashing unexpectedly.
• To inform the user or other parts of the system about the issues that occurred.
• To enable the application to respond correctly to errors, such as retrying an operation, using a fallback plan, or saving data.

In Go, error handling is implemented through returned values of type error. This allows explicit checking and handling of errors at each step.

func readFile(filename string) ([]byte, error) {
    data, err := os.ReadFile(filename)
    if err != nil {
        return nil, err
    }
    return data, nil
}

Thus, proper error handling improves the quality and stability of software.