Implement the error interface in Go by adding an Error() method that returns a string to your custom type.
Implement the error interface by defining a method named Error() that returns a string on your custom type. This single method satisfies the interface, allowing your type to be used wherever an error is expected.
type MyError struct {
msg string
}
func (e MyError) Error() string {
return e.msg
}
In Go, an error is just a type that can describe itself as a string. By adding a method called Error() to your custom type, you tell the language how to display that error message. It's like giving a custom object a name tag so the system knows how to identify it when something goes wrong.