Transforming the challenges into opportunities:

What Should an Angular Developer Know?

• Skills
  •  JavaScript
  • TypeScript
  • HTML/CSS
  • Angular Framework
• Tools
  • Visual Studio Code
  • Angular CLI
• Responsibilities
  • Collaborate with backend developers

• Best Practices
  • Following the Angular style guide for code consistency.
  • Implementing lazy loading for optimizing performance.
  • Use of Angular CLI for project scaffolding and management
  • Modular code organization
  • Utilizing reactive forms for handling user input

Create a detailed list of 100 Angular interview questions covering various complexity and areas is difficult, but I can outline categories and populate them with questions to meet your goal.

This broad coverage will assess a candidate’s Angular knowledge from basics to advanced practices.

Table of Contents:

Basic Concepts (1-20)

1. What is Angular and why is it used?
2. Explain the architecture of Angular applications.
3. What is the difference between AngularJS and Angular?
4. Describe components in Angular.
5. What is the role of modules in Angular.
6. How does data binding work in Angular?
7. What are templates in Angular?
8. Explain directives in Angular. Can you name a few types?
9. What are services and their purpose in Angular?
10. Describe the concept of dependency injection in Angular.
11. What is routing in Angular?
12. How do you create a new Angular project using CLI?
13. What are pipes in Angular and give an example of a built-in pipe.
14. Explain the difference between Constructor and ngOnInit in Angular.
15. What are observables in Angular and how are they used?
16. Describe the process of event binding in Angular.
17. How do you implement form handling in Angular?
18. Explain the concept of two-way data binding in Angular.
19. What is a template reference variable in Angular and how would you use it?
20. How do you use *ngIf, *ngFor, and *ngSwitch directives?

Intermediate Concepts (21-40)

21. Explain lazy loading in Angular.
22. What is the Angular HttpClient and how do you use it for HTTP requests?
23. Describe how to create and use interceptors in Angular.
24. How do you manage state in an Angular application?
25. What are guards in Angular routing and how are they used?
26. Explain the role of providers in Angular.
27. How do you create custom directives in Angular?
28. What are the differences between reactive forms and template-driven forms?
29. How do you perform validation in Angular forms?
30. What is Angular Universal and why is it used?
31. Explain Angular’s change detection strategy.
32. How can you optimize the performance of an Angular application?
33. Describe the use of the async pipe in Angular.
34. How do you use environment variables in Angular?
35. What is AOT compilation and why is it important?
36. Explain the concept of dynamic components in Angular.
37. How do you handle errors in Angular applications?
38. What is the purpose of the trackBy function in *ngFor directive?
39. How do you secure Angular applications?
40. What are decorators in Angular and how are they used?

Advanced Concepts (41-60)

41. Explain the concept of Zones in Angular.
42. How do you use RxJS operators in Angular services?
43. Describe the process of server-side rendering with Angular Universal.
44. What are Angular libraries and how do you create one?
45. How do you implement feature modules in Angular?
46. What is the difference between BehaviorSubject and Subject in RxJS?
47. How do you optimize Angular’s change detection?
48. Explain how to use web workers in Angular.
49. What are Angular elements and how do you use them?
50. How do you implement global error handling in Angular?
51. Discuss the strategies for internationalization in Angular.
52. What is the Ivy renderer in Angular and what are its benefits?
53. How do you upgrade an Angular application from an older version to the latest version?
54. Describe the process of custom validator creation in Angular forms.
55. How do you implement animations in Angular?
56. What is dependency injection token in Angular and how is it used?
57. Explain the use of schematics in Angular.
58. What are the best practices for securing Angular applications against XSS attacks?
59. How do you implement lazy-loaded modules in Angular?
60. Discuss the use of service workers in Angular applications for creating progressive web apps (PWAs).

Testing & Debugging (61-80)

61. How do you test Angular components?
62. What is TestBed in Angular testing?
63. How do you mock services in Angular tests?
64. Explain how to use Jasmine and Karma for unit testing in Angular.
65. What are the best practices for end-to-end testing in Angular applications?
66. How do you debug Angular applications in the browser?
67. What are some common errors in Angular applications and how do you solve them?
68. How do you test Angular directives?
69. What is the role of Protractor in Angular applications?
70. How do you test Observables in Angular?
71. Discuss the strategies for performance testing in Angular applications.
72. How do you use Angular CLI for testing?
73. What are the common challenges in Angular testing and how do you address them?
74. Explain the concept of stubs in Angular testing.
75. How do you ensure your Angular application is accessible (a11y)?
76. What tools do you use for debugging Angular applications during development?
77. How do you test Angular pipes?
78. Discuss the importance of code coverage in Angular testing.
79. How do you handle asynchronous operations in Angular tests?
80. What strategies do you use for testing Angular forms?

Best Practices & Patterns (81-100)

81. What are the best practices for structuring Angular applications?
82. How do you handle configuration and environment-specific settings in Angular?
83. Discuss the Singleton pattern in Angular.
84. What are some anti-patterns in Angular development?
85. How do you manage subscriptions in Angular components?
86. What are the best practices for using RxJS in Angular?
87. How do you ensure high performance in Angular applications?
88. What are the best practices for CSS and Angular animations?
89. How do you handle data immutability in Angular?
90. Discuss the importance of modularization in Angular.
91. What are the benefits of using Angular CLI?
92. How do you implement error tracking in Angular applications?
93. What are the best practices for securing Angular applications?
94. How do you manage large-scale Angular applications?
95. What are the best practices for Angular component communication?
96. How do you handle API versioning in Angular applications?
97. Discuss the Factory pattern in Angular.
98. What are the best practices for Angular code documentation?
99. How do you optimize Angular application for SEO?
100. Discuss the strategy pattern in Angular and its use cases.