Ionic Interview Questions and Answers for 2 years experience

1. What is Ionic?

   • Answer: Ionic is a free and open-source SDK for hybrid mobile app development. It uses web technologies like HTML, CSS, and JavaScript to build apps that run on various platforms (iOS, Android, Web) from a single codebase. It leverages Cordova/Capacitor for native functionality access.

2. Explain the difference between Ionic, Cordova, and Capacitor.

   • Answer: Ionic is the framework that provides UI components and tools for building the app's user interface. Cordova and Capacitor are both native wrappers that allow you to package your web app into a native app for different platforms. Cordova uses a WebView, while Capacitor uses a native bridge offering improved performance and access to newer platform features.

3. What are Ionic components? Give some examples.

   • Answer: Ionic components are pre-built UI elements that you can use to quickly create your app's interface. Examples include ``, ``, ``, ``, ``, ``, ``, etc. They provide a consistent look and feel across platforms.

4. How do you handle navigation in Ionic?

   • Answer: Ionic uses Angular's routing system (if using Angular) or its own navigation component to handle navigation between different views/pages within the app. This usually involves using `NavController` (older versions) or declarative routing with the `routerLink` directive (Angular).

5. Explain how to use Ionic services.

   • Answer: Ionic services are used to encapsulate business logic and data access. They are usually created as Angular services (if using Angular) and injected into components using dependency injection. This promotes code reusability and maintainability. They can handle tasks like API calls, data storage, and other backend interactions.

6. Describe the lifecycle of an Ionic component.

   • Answer: The lifecycle of an Ionic component (within an Angular context) follows Angular's component lifecycle. Key events include `ngOnInit`, `ngOnChanges`, `ngDoCheck`, `ngAfterContentInit`, `ngAfterContentChecked`, `ngAfterViewInit`, `ngAfterViewChecked`, and `ngOnDestroy`. These methods allow you to perform actions at specific points in the component's lifecycle.

7. How do you access device features (camera, GPS, etc.) in Ionic?

   • Answer: You access device features using plugins. Cordova or Capacitor plugins provide JavaScript APIs to interact with native device capabilities. You install these plugins using the appropriate command-line tools (e.g., `npm install cordova-plugin-camera`) and then import and use them within your Ionic components.

8. What are Ionic pipes? Give examples.

   • Answer: Ionic pipes (using Angular) transform data before displaying it in the template. Examples include `DatePipe` (formats dates), `CurrencyPipe` (formats currency), `JsonPipe` (formats JSON), and `UpperCasePipe`/`LowerCasePipe` (case transformation).

9. How do you handle data persistence in an Ionic app?

   • Answer: Several methods exist: local storage (using `localStorage` or `IonicStorageModule`), SQLite (using a plugin), or a backend database (e.g., Firebase, REST API). The choice depends on the app's needs regarding data size, complexity, and security.

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