handling With a message in Go

In Go, try/catch/finally is implemented differently than in some other languages such as Java. Instead, Go has the defer, panic, and recover statements that are used together to create similar functionality.

To use these statements with a message to handle errors in Go, first use defer to create a function that will be run at the end of the current function, regardless of whether or not an error has occurred. This function should have a recover statement inside it to catch any panics and handle them appropriately.

Below is an example of how to handle errors with a message using these statements in Go:

func divide(x, y int) (result int, err error) {
	defer func() {
		if r := recover(); r != nil {
			err = fmt.Errorf("runtime error: %v", r)
		}
	}()
	
	if y == 0 {
		panic("cannot divide by zero")
	}
	
	result = x / y
	return result, nil
}

In the example above, the divide function takes two integers x and y as parameters and returns the result of dividing x by y. If y is equal to 0, a panic is triggered with the message "cannot divide by zero". The defer statement defines an anonymous function that checks for a panic and sets the err variable to an error message if one occurs.

To use this function, you would call it like this:

result, err := divide(10, 0)
if err != nil {
	fmt.Println(err)
} else {
	fmt.Println(result)
}

In this call, y is set to 0, which causes a panic. The defer function catches the panic and sets the err variable to an error message. The message "cannot divide by zero" is then printed. If y had been any other value, the result of the division would be printed instead of an error message.

By using defer, panic, and recover in Go, you can create similar functionality to try/catch/finally in other languages, allowing you to handle errors with more specific messages.