When you return to the code, we can see that we use the HttpClient class by calling two consecutive methods: .get<Quiz[]>() and .subscribe(). The former, as the name suggests, issues a standard HTTP request to our .NET Core QuizController to fetch an array of quizzes; we use a local string variable to assemble the controller's endpoint URL and then toss it as a parameter. The latter instantiates an Observable object that will execute two very different actions right after a result and/or in case of an error. Needless to say, all this will be done asynchronously, meaning that it will run in a separate thread (or scheduled for later execution), while the rest of the code continues to execute.
It's very important to understand ...
