Hands-On Full Stack Web Development with Angular 6 and Laravel 5

Creating the handleError function

Now, let's add the error handling for the bikes service. Add the following code, right after the voteOnBike() function:

     /** Error handler */
        private  handleError(error:  HttpErrorResponse) {
                if (error.error  instanceof  ErrorEvent) {
                        // A client-side error.
                        console.error('An error occurred:',                 error.error.message);
                } else {
                        // The backend error.
                        return  throwError(error);
                }
                // return a custom error message
                return  throwError('Something bad happened; please try                again later.');
        }

As we can see, the handleError() function on the bike service is the same as the authentication service, and will be the same on the builders service. Whenever you need to write the same code more than once, it is highly recommended that ...