Library › Book 12 › Composition
Composition
11.1🔒OverviewInheritance says "a LoginPage is a BasePage." Composition says "a DashboardPage has a NavigationComponent and a NotificationPanel." When…
11.2🔒Composition vs. InheritanceThe rule of thumb: use inheritance when there is a genuine "is-a" relationship. Use composition when there is a "has-a" relationship.
11.3🔒Component-Based Page ObjectsReal pages have multiple components. Composition lets you assemble a page from reusable parts.
11.4🔒Injecting Components (Dependency Injection)Instead of creating components inside the class, you can pass them in from outside. This makes testing much easier because you can inject…
11.5🔒Exercises: Chapter 11Easy: Create a HeaderComponent class with a get_logo_text() method and a FooterComponent class with a get_copyright() method. Create a…
11.6🔒Q&AQuiz: Chapter 111. What is the difference between "is-a" and "has-a" relationships? 2. When should you prefer composition over inheritance? 3. What is…
11.7🔒Career Translation- Architected page object components (navigation bar, data tables, modals, search widgets) using composition, enabling reuse across 40+…
11.8🔒Q&AInterview Depth CheckPrompt: You have a navigation bar that appears on every page of the application. How do you model it using composition, and what are the…