Top Angular 7 Interview Questions to Prepare for Your Next Interview

Wouldn’t it be ideal if you know what interview questions you could expect at your next job interview? Interview Kickstart can help with just that! This article focuses on Angular interview questions that will help you prepare for your next job interview. Did you know that the same team at Google that made AngularJS actually made the Angular framework, and it has several versions! In fact, Angular 7 was released relatively recently in October of 2018 and supported TypeScript 3.1, Node 10, and RxJS 6.3. 

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In this article, we’ll learn:

• Sample Angular 7 interview questions and answers
• More Angular 7 interview questions for developers
• Advanced Angular 7 interview questions
• FAQs on Angular 7 interview questions

Sample Angular 7 Interview Questions and Answers

Let us begin with some sample questions and answers to get an idea of what types of questions can be asked.

Sample Angular 7 Interview Questions and Answers for Beginners

1. Why does incremental DOM have a low memory footprint in Angular 7?

Every time we re-render, Virtual DOM creates a tree from scratch. But incremental DOM requires no memory to re-render the view as long as the DOM isn’t changed, and the memory has to be allocated only when the DOM nodes are added or deleted. The size of the memory allocation is also proportional to the size of the change in DOM. 

2. Define the Angular TestBed in the context of Angular 7.

The Angular TestBed or ATB is a higher-level testing framework exclusively for Angular, which helps us test behaviors with a dependency on Angular Framework smoothly. It provides a dynamically-constructed Angular test module that emulates an Angular @NgModule.

Sample Angular 7 Interview Questions and Answers for Experienced

1. What is Redux in the context of Angular 7?

Redux is a way to manage the application state and improve the maintainability of asynchronicity in our application. It provides a single truth source for the application state and a unidirectional flow of data change. 

2. What are the utility functions provided by RxJS in Angular 7?

Some utility functions RxJS library provides that help us create and work with observables are filtering streams, mapping values to different types, creating multiple streams, iterating through the values in a stream, and converting code into observables for async operations.

More Angular 7 Interview Questions for Developers

Take a look at these sample interview questions to assess your preparation level:

1. In the context of Angular 7, define and explain:

• Pipes 
• Observables
• Observer
• Multicasting
• Redux
• Router outlet
• Subscribing
• TestBed
• Ivy Renderer
• Zone

2. Differentiate between:

• Component and module
• Angular 7 and AngularJS

Advanced Angular 7 Interview Questions

1. How will you select an element in a component template?
2. What is the minimum definition of a component?
3. Describe the utility functions provided by RxJS?
4. Discuss ways to control AOT compilation?
5. Define and describe:
   Activated route
   Redux
   Angular 7
   Angular framework
   Shell
6. How does redux relate to an Angular app?
7. Why does Incremental DOM have a low memory footprint?
8. Do I need to bootstrap custom elements?
9. How to set headers for every request in Angular?
10. What are the advantages of AOT?
11. What is Angular 7? How is it different from AngularJS?
12. Differentiate between:
    AngularJS and Angular.
    Structural directive and attribute directive
    Declarations, import, and providers in NgModule
13. What does a just-in-time (JIT) compiler do (in general)?
14. What is Incremental DOM? How is it different from Virtual DOM?
15. What are the key components of Angular 7?
16. What is Shell?

Want to practice more Angular interview questions? Read Angular Interview Questions You Must Prepare for in 2022 to take your prep to the next level.

FAQs on Angular 7 Interview Questions

1. How old is Angular 7?

Angular 7 was released relatively recently in October of 2018. As of December 2021, Angular 13.0 is the latest version of Angular available.

2. Name the main building blocks of an Angular 7 application.

The seven main building blocks of an Angular application are Templates, Component, Dependency Injection, Metadata, Data Binding, Directives, and Services.

3. What’s the difference between Angular 7 and AngularJS?

AngularJS or Angular 1.0:

• Is not supported by mobile browsers.
• Is written in JavaScript
• Makes use of MVC architecture
• Has complicated syntax
• Does not require additional plugins

Angular7, on the other hand, is a complete rewrite of Angular JS and supports:

• Two-way data binding
• TypeScript 3.1
• Node 10
• RxJS 6.3
• Angular Elements, Angular Material, CDK Components
• ng update, ng add
• RxJS v6 
• CLI Workspaces 
• Library Support
• Angular Material Starter Components
• Tree Shakable Providers
• Animations Performance Improvements

4. What are some of the best IDEs for Angular 7?

Angular IDE, Webstorm, and Visual Studio Code are some of the best Angular IDEs for Angular 7. Sublime Text, Brackets, and Atom are also good options available as IDEs for Angular 7.

5. How would you update Angular 6 to Angular 7?

Angular 6 can be converted to Angular 7 by using the following command:

ng update @angular/cli @angular/core   

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