How can I handle errors in Go?

How can I handle errors in Go?

In Go, you can handle errors by returning an error value from functions. For example:

func divide(a, b int) (int, error) {
    if b == 0 {
        return 0, fmt.Errorf("cannot divide by zero")
    }
    return a / b, nil
}

This function returns an error if the divisor is zero.

Can you give me an example of using error handling in a real application?

Sure! In a web server, you might handle errors like this:

http.HandleFunc("/divide", func(w http.ResponseWriter, r *http.Request) {
    a, b := 10, 0
    result, err := divide(a, b)
    if err != nil {
        http.Error(w, err.Error(), http.StatusBadRequest)
        return
    }
    fmt.Fprintf(w, "Result: %d", result)
})

This will return a 400 error if division by zero occurs.

What are some best practices for error handling in Go?

Some best practices include:

1. Always check for errors after calling a function that returns an error.
2. Use descriptive error messages.
3. Wrap errors with additional context using fmt.Errorf.
4. Avoid using panic for regular error handling.