InjectionToken with a default in Angular
Angular interview exercise on Dependency injection, difficulty 2 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
Export an InjectionToken API_BASE for a string, defaulting to "https://api.example.com" through a root factory. ApiLinkComponent injects it and renders <a class="users"> whose href is the base followed by "/users", reading "All users".
Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Progress is saved in your browser, and in your account if you sign in.