How do I use the errors package in Go?

How do I use the errors package in Go?

The errors package in Go provides simple error handling. You can create a new error using errors.New("error message").

Can you show me an example of creating a custom error?

Sure! You can define a custom error type by implementing the Error() method. Here's a simple example:

type MyError struct {
    Message string
}

func (e *MyError) Error() string {
    return e.Message
}

Then, you can create an instance of MyError like this:

return &MyError{Message: "This is a custom error"}

What about wrapping errors? How does that work?

You can wrap errors using the fmt.Errorf function with the %w verb. For example:

return fmt.Errorf("an error occurred: %w", err)
``` This allows you to preserve the original error.

Is there a way to check if an error is of a specific type?

Yes! You can use the errors.As function to check if an error is of a specific type. Here's how:

var myErr *MyError
if errors.As(err, &myErr) {
    // Handle MyError
}