Angular Senior Interview Essentials: Easy-Level Quiz Quiz

Explore key concepts and best practices in Angular development with this easy multiple-choice quiz, designed to help candidates and professionals review senior-level Angular interview topics. Perfect for those wanting to reinforce knowledge of core Angular principles, dependencies, debugging strategies, and RxJS usage.

1. Angular Default Dependencies

   Which library is included by default as a dependency in an Angular application created with the Angular CLI?

   1. RxJS
   2. Jest
   3. Tailwind
   4. Prettier

   Explanation: RxJS is included as a default dependency in Angular applications for handling reactive programming and asynchronous data. Prettier, Jest, and Tailwind are not included by default; they are additional tools developers can choose to add. While Prettier formats code, Jest is used for testing, and Tailwind is a utility-first CSS framework.

2. Code Formatting Tools

   Which tool is commonly used to automatically format code in an Angular project based on team-defined rules?

   1. Webpack
   2. Bootstrap
   3. Prettier
   4. Lodash

   Explanation: Prettier automatically formats code to maintain consistency and improve readability according to specified styles. Webpack is a module bundler, Lodash is a utility library, and Bootstrap is a CSS framework; none of these handle code formatting automatically.

3. Debugging Angular in Templates

   When debugging state or data binding in Angular templates, which method can help you visualize data directly in the UI?

   1. Adding styles to the component
   2. Console.log in the constructor
   3. Using string interpolation with the JSON pipe
   4. Running unit tests

   Explanation: String interpolation with the JSON pipe lets you display variable data directly in the template, making UI state visible during change detection. Console.log in the constructor only logs during instantiation, not template updates. Styles and unit tests do not directly display data changes in the template.

4. Purpose of Husky or lint-staged

   Why might you use a tool like Husky or lint-staged in an Angular project?

   1. To design UI components
   2. To run formatting or linting scripts automatically on git commit
   3. To increase application runtime speed
   4. To connect to databases

   Explanation: Husky and lint-staged help enforce code quality by triggering formatting or linting scripts when code is committed. They do not affect application speed, UI design, or database connectivity; those tasks require different tools and solutions.

5. Custom RxJS Operator Use Case

   What is a likely use case for creating a custom RxJS operator in an Angular application?

   1. Defining new Angular components
   2. Upgrading CLI dependencies
   3. Adding extra CSS styles
   4. Filtering specific keystrokes in a stream, such as allowing only alphanumeric input

   Explanation: Custom RxJS operators are often written to add specialized behavior to observables, like filtering for specific keystrokes. Defining components, adding styles, or updating CLI dependencies are not accomplished with RxJS operators.

6. Debugging Logic in Angular Components

   Which tool is most suitable for stepping through Angular component logic during debugging?

   1. Browser debugger with source maps
   2. Network tab in browser dev tools
   3. Online code editor
   4. Build optimizer

   Explanation: A browser debugger combined with source maps helps trace and step through component logic as it executes, making it ideal for debugging. The network tab shows network requests, online editors provide code editing, and build optimizers help in production builds, not debugging logic.

7. Angular Dependency Management Advice

   What is generally recommended regarding adding third-party dependencies to an Angular application?

   1. Only use dependencies with animal names
   2. Use as few additional dependencies as possible
   3. Add all popular libraries by default
   4. Avoid updating dependencies

   Explanation: Minimizing additional dependencies reduces maintenance and potential compatibility issues. Adding all popular libraries or choosing based on names is not good practice, and it is important to keep dependencies updated, not avoid updates.

8. UI Component Libraries

   Which of the following is a commonly used UI component library in Angular projects?

   1. Electron
   2. Angular Material
   3. Git
   4. Jasmine

   Explanation: Angular Material provides reusable UI components tailored for Angular applications. Jasmine is a testing framework, Electron is for building desktop apps, and Git is for version control; none are UI component libraries.

9. Template vs Console Debugging

   Why might displaying data in the Angular template be preferable to logging in the console when diagnosing change detection issues?

   1. Console logs update immediately even when change detection has not run
   2. Console is always more accurate
   3. Templates cannot display data bound variables
   4. You can see the data update as the UI changes, reflecting real-time change detection

   Explanation: Reflecting data in templates allows you to observe state changes as they are rendered, providing insight into Angular's change detection. Console logs don’t guarantee synchronization with UI updates. Templates are designed for data display, and while the console is useful, it may not reflect real-time changes.

10. Testing Framework Replacement

    Which JavaScript testing framework is sometimes preferred over Angular's default for easier or faster testing setup?

    1. Jest
    2. Moose
    3. Tailspin
    4. Less

    Explanation: Jest is a popular choice for testing due to its speed and easy setup, often replacing Angular's default testing tools. Moose, Less, and Tailspin are not JavaScript testing frameworks; Less is a CSS preprocessor and the others are unrelated.

11. Purpose of Tailwind

    In Angular development, why might someone choose to use Tailwind?

    1. To lint JavaScript files
    2. To handle HTTP requests
    3. To manage application state
    4. To style components using utility-first CSS classes

    Explanation: Tailwind is a utility-first CSS framework, making it ideal for styling components with predefined classes. It does not manage state, lint code, or handle HTTP requests; those are handled by different tools.

12. Observable Filtering Example

    When handling a dropdown search in Angular, how would a custom RxJS operator help filter user input?

    1. By performing end-to-end tests
    2. By automatically compiling HTML templates
    3. By allowing only alphanumeric input events to trigger search updates
    4. By connecting the application to an API

    Explanation: A custom operator can filter events to allow only alphanumeric inputs, reducing noise in the dropdown search. Compiling templates, testing end-to-end, and connecting to APIs are not achieved through RxJS operators.

13. Source of Dependency Updates

    Which command line tool is typically used to manage and update dependencies in an Angular project?

    1. tailwind
    2. npm
    3. rxjs-builder
    4. chrome

    Explanation: npm is the standard tool for managing and updating dependencies in JavaScript and Angular projects. Tailwind is for styling, chrome is a browser, and rxjs-builder is not a recognized dependency manager.

14. Role of Angular Dev Tools

    What does Angular Dev Tools help with during component debugging?

    1. Writing CSS selectors
    2. Managing git commits
    3. Optimizing build performance
    4. Inspecting the injector hierarchy and component state

    Explanation: Angular Dev Tools helps you trace component trees, view injector hierarchies, and inspect component states for debugging. It does not assist with CSS, build optimization, or version control.

15. Best Practice for Team Code Formatting

    How does using a formatting tool benefit teams working collaboratively on Angular projects?

    1. It ensures consistent code style regardless of individual editor configurations
    2. It adds new components with AI
    3. It increases the default bundle size
    4. It automatically merges all feature branches

    Explanation: A code formatter like Prettier ensures all code follows the same style, independent of personal preferences or editors. Merging branches is a version control function, component generation is not done by formatting tools, and formatting has no effect on bundle size.