Angular interview questions with answers

Knowing Angular but struggling with Angular job interviews? You're in the right place! This comprehensive course focuses on mastering the most frequently asked Angular interview questions. We go beyond basic knowledge to help you articulate your understanding with clarity and precision – a crucial skill for acing your next technical interview.

This is a revision course designed to help you prepare for Angular interviews. We break down common question types and provide detailed, elaborate answers to showcase your expertise. Please note: This course does not teach Angular from scratch. If you're looking for a step-by-step Angular tutorial, check out our dedicated Learn Angular video series.

Here's a detailed breakdown of the topics covered:

Angular Fundamentals (Part 1)

• Angular Basics:
  • What is the purpose and benefits of using Angular?
  • Understanding Angular Directives: Types and Importance.
  • The role and significance of NPM and the Node_Modules folder.
  • The importance of the Package.json file in an Angular project.
  • What is TypeScript and why is it essential for Angular development?
  • The importance of the Angular CLI for efficient development.
  • Understanding the relationship between Components and Modules.
  • What are Decorators in Angular and how are they used?
  • Understanding Annotations and Metadata in Angular.
  • What is a Template and its role in Angular applications?
  • Exploring the four types of Data Binding in Angular.
  • Understanding the overall Architecture of Angular.
  • What is a Single Page Application (SPA) and its benefits in Angular?
  • How to implement a SPA using Angular.
  • Implementing Routing in Angular applications.
  • Understanding and implementing Lazy Loading for improved performance.
  • Defining and using Services in Angular.
  • Understanding and implementing Dependency Injection (DI).
  • Benefits of using Dependency Injection.
  • Distinguishing between ng serve and ng build.
  • Understanding the --prod parameter in ng build.

Advanced Angular Concepts (Part 2)

• ViewChild & ViewChildren:
  • Understanding and using ViewChild and ViewChildren for accessing DOM elements.
  • The purpose of Template Reference Variables.
  • Understanding Content Projection and Content Projection Slots.
  • Distinguishing between ContentChild and ContentChildren.
  • A comparison of ViewChild vs ViewChildren vs ContentChild vs ContentChildren.

Angular Component Lifecycle (Part 3)

• Understanding the importance of the Component lifecycle.
• Explaining the events and sequence of the component lifecycle.
• Comparing and contrasting constructor vs. ngOnInit().

Tricky Interview Questions (Part 4)

• HTTP Calls: Making HTTP calls in Angular applications.
• Understanding the need for the Subscribe function.
• Handling errors when HTTP calls fail.
• Passing data between components in Angular.
• Understanding Input, Output, and Event Emitters.
• Passing data during routing in Angular.
• Is it a good practice to pass data using services?

Angular Pipes (Part 5)

• The purpose and need for Angular Pipes.
• Listing some built-in Angular Pipes.
• Creating Custom Pipes in Angular.

RxJS (Reactive Extensions for JavaScript) (Part 6)

• What is RxJS and its full form?
• The purpose of RxJS in Angular development.
• Understanding Observables and Observers.
• Using Subscribe with sample code.
• Unsubscribing from Observables in RxJS.
• Understanding the concept of operators with sample code.
• Installing RxJS.
• Differentiating between Promises and RxJS.
• Common use cases of RxJS in Angular.
• Popular RxJS operators used in Angular.
• Understanding Push/Reactive vs Pull/Imperative programming paradigms.

Angular Interceptors (Part 7)

• What are Interceptors in Angular and how do they work?
• Implementing Interceptors in Angular applications.
• Common use cases for Interceptors.
• Can you provide multi-Interceptors?