Advanced Angular Interview Questions
Advanced Angular Interview Questions
Advanced Angular Interview Questions
Advanced Angular interview questions probe candidates' in-depth understanding of Angular's architecture, best practices, and advanced features such as dependency injection, change detection, and reactive programming. These questions assess a candidate's ability to design and optimize complex Angular applications, troubleshoot issues effektivly, and stay abreast of the latest Angular development trends. By asking such questions, interviewers can identify candidates with a deep grasp of Angular's capabilities and the skills to build scalable and maintainable web applications.
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1 - Explain Angular's component lifecycle hooks.
ngOnInit: Initializes component after Angular loads it.
ngOnChanges: Triggers when an input property changes.
ngDoCheck: Performs a deep check on component inputs.
ngAfterContentInit: Called when component content is fully loaded.
ngAfterContentChecked: Similar to ngAfterContentInit, but runs after content is checked.
ngAfterViewInit: Called when component view is fully loaded.
ngAfterViewChecked: Similar to ngAfterViewInit, but runs after view is checked.
ngOnDestroy: Called when component is destroyed, used for clean up operations.
2) Describe the difference between services, providers, and dependency injection in Angular.
Services are reusable, singleton classes that can be injected into components.
Providers specify how a service is created and provided to components.
Dependency injection (DI) automatically instantiates and provides dependencies to components, services, and other classes.
3) Explain change detection in Angular.
Angular uses a zone based change detection system to track changes in application state and update the DOM efficiently.
Zones allow Angular to control when change detection runs, reducing unnecessary updates.
4) Discuss the benefits and drawbacks of using the Angular CLI.
Benefits:
Generates boilerplate code and optimizes build configurations.
Provides commands for easy project management.
Automates unit testing and linting.
Drawbacks:
Can be opinionated and limit customization.
May not be suitable for all projects.
5) Describe techniques for improving Angular application performance.
Use change detection on demand with ngIf, ngForOf, and ngSwitch.
Optimize DOM structure for fast rendering.
Avoid unnecessary change detection cycles with @Input setters and ngZone.runOutsideAngular().
Lazy load modules and components to reduce bundle size.
6) Explain the role of Input vs Output in Angular.
Input: Defines component properties that can be set from outside.
Output: Defines event emitters that allow components to communicate with their parents.
7) Describe the Angular Router and how it manages navigation.
The Angular Router manages navigation between routes (URLs).
It uses components to render views for specific routes.
Router events provide information about navigation changes.
8) Discuss the advantages and disadvantages of TypeScript in Angular.
Advantages:
Strong typing improves code readability and maintainability.
Error detection at compile time reduces bugs.
IDE support for autocompletion and refactoring.
Disadvantages:
Can increase bundle size due to transpilation.
May require additional configuration for older environments.
9) Explain how Angular uses reactive forms.
Reactive forms use observables to represent form state and handle validations.
FormControls, FormGroups, and FormArrays allow for building complex forms.
FormBuilder is used to create and manage forms easily.
10) Discuss the role of RxJS in Angular applications.
RxJS is a library for reactive programming, providing observables, operators, and subjects.
It enables data streaming, event handling, and state management in Angular applications.
11 - Explain the difference between host binding and host listener in Angular.
Host binding: Binds component properties to DOM attributes or events.
Host listener: Listens for DOM events and calls component methods.
12) Describe how Angular handles HTTP requests.
Angular provides the HttpClient service for performing HTTP requests.
Interceptors can be used to add custom logic to requests and responses.
Observable APIs allow for asynchronous handling of responses.
13) Discuss the concept of dependency injection in Angular, including its benefits and best practices.
Dependency injection (DI) automatically provides dependencies to components and other classes.
It promotes loose coupling and makes code easier to test and maintain.
Best practices include defining providers in a central location and using a consistent naming convention.
14) Explain the purpose of the zone.js library in Angular, and how it affects change detection.
Zone.js is a library that wraps the native browser API and allows Angular to intercept and manage changes.
It triggers change detection when relevant events occur, such as DOM events or user interactions.
15) Discuss the differences between the two main types of Angular change detection: OnPush and Default.
OnPush: Change detection is only performed when an input property changes or when a method marked with ChangeDetectorRef.markForCheck() is called.
Default: Change detection is performed automatically when any change occurs in the component or its child components.
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- Course Overview
- Prepare for advanced Angular interview challenges with this comprehensive course. Covering advanced concepts such as component communication, dependency injection, performance optimizations, change detection, and testing best practices, this course empowers you with the knowledge and techniques to impress potential employers and secure your dream Angular role.
- Course Description
- Master the intricate details of Angular with our “Advanced Angular Interview Questions” course. Delve into complex concepts like dependency injection, performance optimizations, RxJS, reactive forms, and unit testing. Gain an edge in technical interviews and enhance your proficiency in Angular's advanced features.
- Key Features
- 1 - Comprehensive Tool Coverage: Provides hands-on training with a range of industry-standard testing tools, including Selenium, JIRA, LoadRunner, and TestRail.
- 2) Practical Exercises: Features real-world exercises and case studies to apply tools in various testing scenarios.
- 3) Interactive Learning: Includes interactive sessions with industry experts for personalized feedback and guidance.
- 4) Detailed Tutorials: Offers extensive tutorials and documentation on tool functionalities and best practices.
- 5) Advanced Techniques: Covers both fundamental and advanced techniques for using testing tools effectively.
- 6) Data Visualization: Integrates tools for visualizing test metrics and results, enhancing data interpretation and decision-making.
- 7) Tool Integration: Teaches how to integrate testing tools into the software development lifecycle for streamlined workflows.
- 8) Project-Based Learning: Focuses on project-based learning to build practical skills and create a portfolio of completed tasks.
- 9) Career Support: Provides resources and support for applying learned skills to real-world job scenarios, including resume building and interview preparation.
- 10) Up-to-Date Content: Ensures that course materials reflect the latest industry standards and tool updates.
Benefits of taking our course
Functional Tools
Tools Utilized in Advanced Angular Interview Questions Course
- Angular Development Kit (Angular CLI)
- Provides a command line interface for scaffolding and managing Angular projects, automating common tasks and generating code faster.
- Includes commands for creating components, directives, services, and more, simplifying project setup and development process.
- 2. TypeScript
- A superset of JavaScript with strong typing, making applications more robust and maintainable.
- Enables static type checking, reducing runtime errors and improving code quality and performance.
- 3. RxJS
- A powerful reactive programming library that simplifies asynchronous tasks such as event handling, data streams, and observables.
- Facilitates the management of complex data flows and improves application responsiveness.
- 4. Jest
- A testing framework for JavaScript and TypeScript that allows for fast and reliable unit and integration testing.
- Provides assertions, spies, stubs, and mocks for testing various aspects of an Angular application.
- 5. NgRx Store
- A state management library that centralizes application state and simplifies data flow.
- Implements the Redux pattern, allowing for a predictable and centralized management of application data and actions.
- Training Program for Students
- Our Advanced Angular Interview Questions training program is designed to equip students with the knowledge and skills necessary to excel in Angular interviews. The program includes:
- In depth coverage of Angular fundamentals and advanced concepts
- Hands on exercises and projects to reinforce understanding
- Interview preparation tips and strategies
- A portfolio of projects to showcase proficiency
- Access to a community of experienced professionals for support and guidance
- This comprehensive program empowers students with the confidence and expertise to successfully navigate Angular interviews and secure their dream jobs.
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