Angular Interview Questions

I’ll provide a set of Angular interview questions categorized for beginners, intermediate developers, and expert developers.

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Beginner Developer:

1. What is Angular and how does it differ from AngularJS?
2. Explain the basic architecture of an Angular application.
3. What is the purpose of the NgModule in Angular?
4. How do you bind data in Angular? Provide examples of one-way and two-way data binding.
5. Explain the difference between {{ }} and [ ] in Angular template syntax.

Intermediate Developer:

1. What is a service in Angular? How do you create and use a service?
2. Explain the concept of Dependency Injection in Angular.
3. What are Angular directives? Can you give examples of built-in directives and how to create custom directives?
4. What is Angular CLI, and how does it simplify the development process?
5. Describe the difference between ngOnInit and ngAfterViewInit lifecycle hooks in Angular.

Expert Developer:

1. Explain Angular Ivy and its benefits. How does it improve performance?
2. What is lazy loading in Angular? How do you implement lazy loading for modules?
3. Describe the Angular change detection mechanism. How can you optimize change detection in a large application?
4. What are Angular Pipes? Can you provide an example of a custom pipe you’ve implemented?
5. Explain the role of NgRx in Angular applications. When would you use it, and what are its main features?
6. How does Angular handle security, and what are best practices for securing an Angular application?
7. Discuss the differences between ngOnChanges, ngOnInit, and ngDoCheck lifecycle hooks. When would you use each one?
8. Explain Angular Universal. How does it enable server-side rendering (SSR), and what are the benefits of SSR in Angular?
9. Describe AOT (Ahead-of-Time) compilation in Angular. What are the advantages, and how is it different from JIT (Just-in-Time) compilation?
10. Discuss the Angular router. How do you implement lazy loading with Angular routing, and what are route guards?

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