Some of the Best Angular Interview Questions for Hiring Top Talent

By gswardman March 21, 2022

Are you planning to transition into an Angular developer? Preparing for an interview can be stressful but also exciting. If you are an employer looking for the best Angular talent, curating the most relevant Angular interview questions can be daunting. Whether you are a job seeker or an employer, this article will help you understand some common questions to ask or expect during an interview.

Table of Contents

What is Angular?

Angular is a Google-maintained open-source JavaScript framework that’s written in TypeScript. Its core purpose is to build single-page applications. Apart from providing developers with a basic system to operate with, it enables users to create multiple applications securely. Angular comes with various advantages that we will learn.

Frameworks are essential for developers because they offer a compatible structure that developers can rely on to improve web development performance and efficiency without building code from zero. Angular comes with a wide range of features which include:

· Document Object Model

Document object model (DOM) handles an HTML or XML document as a tree structure in which every Node illustrates a section of the document. The DOM allows users to execute ten updates on the same HTML page, and Angular updates the whole tree architecture of HTML tags.

· TypeScript

Typescript is a Microsoft-based programming language that is a solid JavaScript syntactical superset. It allows users to write easy to understand JavaScript code. Every TypeScript code compiles with JavaScript and can smoothly flow on multiple platforms. Developers don’t need TypeScript when developing Angular applications. Still, experts recommend it because it provides enhanced syntactic structure and makes the codebase easy to maintain and understand.

· Data Binding

The data binding process allows users to manage web page components via a browser. It uses dynamic HTML without requiring complex programming or scripting.

· Testing

Angular uses the Jasmine testing framework, which offers various functionalities to write different test cases. Karma is the trial runner for these tests that utilize a configuration file to configure the testing network, reporters, and start-up.

· Angular Architecture

Angular is a fully-developed MVC (Model-view-controller) framework that offers clear guidance on the structure of an application. It also provides a bi-directional data circulation and real DOM. Here are some of the building blocks of an Angular application.

· Modules

An Angular app features a root module known as an AppModule, which allows the bootstrap to initiate the application.

· Templates


The Angular template combines HTML with the Angular markup to customize HTML elements before they can be displayed. The two types of data binding are:

  • Property binding through which users can interpolate values computed into the HTML from your application.
  • Event binding, which updates your app data to ensure it responds to user input within the target environment

· Metadata

Metadata guides Angular on class processing. It helps developers decorate a class to ensure it configures the preferred behavior.

· Services

A service class is generated whenever logic or data does not connect with the view but must be shared across elements. The class is usually affiliated with the injectable decorator.

· Dependency Injection

Dependency Injection

Dependency injection allows developers to maintain the efficiency and crispness of their component classes. It doesn’t collect data from a server, verify user input, or directly log in to the console. Instead, it assigns such functions to the services.

Pros of Angular

Angular has a set of pros, as we shall see below.

· Data Binding

The technique through which template sections coordinate with component parts is referred to as data binding. To help Angular understand how to link both the component and template, the binding markup is included in the template HTML. Angular allows users to change data from react to user events and JavaScript code to view without writing code manually.

· Routing

An Angular router helps interpret a web browser’s URL as guidance to move to a client-generated view. The router is restricted to links on a page to notify Angular to steer the application view when users click on it.

· AngularJS Directives

AngularJS Directives

AngularJS directives prolong the HTML by giving it new syntax. Developers can quickly identify directives because they feature the “ng-.” prefix. The DOM element markers instruct AngularJS to affix a specific behavior to the component or convert it.

Here are sample directives.

  • The ng-model directive
  • The ng-model binds the HTML value control with the designated AngularJS expression value.
  • The ng-bind directive
  • The ng-bind directive replaces the HTML control value with a detailed AngularJS

· Browser Compatibility

Angular is compatible with different browsers and cross-platform. An angular app can run on all browsers.

· Custom Components

Angular allows users to develop elements that combine functionality with logic rendering to form reusable pieces. It also aligns with various web components.

Angular enables users to build components that can pack functionality and render logic into reusable pieces. It also plays well with web components.

Cons of Angular

· Steep Learning Curve

Every user should know the Angular essential components includes directives, decorators, dependency injection, templates, and services. Advanced topics include AoT compilation, change detection, and zones. Angular 4 is one of the most complex frameworks for beginners because it’s an entire framework.

· Fewer SEO Options

Angular provides poor accessibility and visibility to search engine crawlers and fewer SEO options.

· Migration

Many organizations shun Angular due to its complexity in moving legacy jquery/js-based code to the angular-style structure. Every new Angular release can be challenging to upgrade.

What Does an Angular Developer Do?

Angular developers work on a software’s client-side. They can develop full-fledged UI services for web applications and websites. Further, Angular developers operate with module and component creation and link them to build essential software.

Angular developers are skilled JavaScript professionals who are conversant with software engineering. Angular developers also manage a collective front end of different mobile and web applications. These professionals are known for developing robust software. They also collaborate with backend developers to facilitate the creation of SPA attains the defined terms and various technical accuracies.

Angular developers are tasked with executing unit testing after completing the development phase, testing services, code units, and components. Every Angular developer must be conversant with acquiring access to external data sources and APIs.

Skills an Angular Developer Should Possess

Hiring the right talent for your Angular project can be challenging. The ideal Angular developer should possess an excellent mastery of JavaScript. They should also have solid theoretical knowledge and experience in software engineering.

Besides being a dynamicJS programmer, these professionals should be conversant with Angular framework concepts. Here are different essential skills you should consider before hiring an Angular developer.

  • Mastery of HTML, Core JavaScript, and CSS
  • Knowledge of various advanced technologies like Node and Webpack
  • Mastery of creating directives, dependency injections, Angular applications, services, controllers, and Observables.
  • Proficiency in JS DOM and AJAX manipulation systems
  • Excellent experience in server-side rendering, validation of user action, and socket handling
  • Knowledge of adjoining technologies such as Webpack for a modular bundle and Node for a run-time environment
  • Understanding pf RxJS, Angular CLI, Node, and Angular CDK

Soft skills that Angular developers should possess:

· Debugging and Testing Skills

Debugging and testing are crucial procedures in development because they analyze the functionality and viability of code. Angular developers can execute unit tests to understand whether a code performs the same intended role.

Many Angular developers debug their code as they write it to guarantee enhanced functionality during the testing phase. Many employers prefer candidates capable of eliminating errors from code and building a robust procedure to prevent a recurrence. Proficiency in some popular frameworks like Jasmine, Karma, and Mochajs will be an added advantage.

· Communication skills

To build applications and websites with the Angular framework, developers collaborate with stakeholders and colleagues to understand the client’s needs. Part of their daily tasks involves generating manuals and documentation during different phases of the development process.

As a result, the ideal developer must have solid verbal and written communication skills, enabling them to communicate clearly and confidently. Additionally, they should be active listeners and possess excellent stress management skills.

Other crucial interpersonal skills for Angular developers include:

  • Ability to operate and manage partnerships with different organization levels effectively
  • Good critical thinking, analytical, prioritization, and problem-solving skills
  • Ability to handle multiple projects at the same time
  • Attention to detail, a highly motivated and a self-starter
  • Proper understanding of the project requirements and specifications to generate thoughtful solutions that align with the technology roadmap and reference structure
  • A team player
  • Project management skills and the ability to execute product evaluation tasks with ease
  • Ability to consider all non-functional and functional requirements
  • Understanding of the project requirements and business objectives
  • Excellent time management skills

What are the Angular Interview Questions and Answers?

Here is a list of Angular interview questions and answers. If you are a job seeker, these questions will help you prepare for your interview. Potential employers can rely on these questions to hire the right candidate for their projects.

1. What is Angular, and why was it Established?

Angular is an open-source JavaScript framework that is written in TypeScript. It leverages the HTML syntax to illustrate the components of your applications clearly.

Angular was established to generate Single Page Applications; The framework adds consistency and structure to web applications while offering outstanding maintainability and scalability.

2. Define TypeScript?

Define TypeScript

TypeScript is a JavaScript superset that provides excellent consistency. Experts highly recommend it because it offers syntactic features making the code easy to maintain and understand. TypeScript compiles to JS and can run effectively on multiple environments.

3. Define Data Binding and Explain the Data Binding Type that Angular Deploys

Data binding is a process that enables internet users to modify web page components with a web browser. It leverages solid HTML and doesn’t need complex programming or scripting. Developers use data binding in web pages containing collective elements like calculators, forms, games, and tutorials. Incremental web page display makes data binding whenever pages have massive data amounts.

Angular leverages the two-way binding. Any changes occurring to the UI are displayed in the interrelated model state. On the contrary, changes occurring in the model state are illustrated in the user interface state. That enables the framework to link the Document Object Model(DOM) to the model data through the controller. However, that approach often affects performance because each change in the DOM must be tracked.

4. Define AOT compilation and Explain its Advantages

AOT compilation

The AOT (Ahead of time) compiler changes the TypeScript code and Angular HTML into JavaScript code during the development phase. Some of this compiler’s advantages include:

  • Minimal asynchronous requests
  • Faster rendering
  • Tiny Angular framework download size
  • Enhanced security
  • Rapid detection of template errors

5. What SPAs (Single Page Applications)

SPAs are web applications that load once. New features, in this case, are only inclusions to the user interface. Instead of loading new HTML to illustrate the content on the new page, SPAs are generated dynamically due to JavaScript’s power to modify the DOM elements on the current page. A SPA approach is faster, which offers a smooth user experience.

6. Define Decorators in Angular?

Decorators are a function or design pattern that illustrates how Angular features operate. They execute prior customization on filter, service, or class. Angular supports different kinds of decorators, which are:

  • Property decorators
  • Class decorators
  • Parameter decorators
  • Method decorators

7. What are some of the Advantages of Angular?

Summon benefits of Angular include:

· MVC Architecture

Angular is a well-developed MVC framework that offers a definite opinion on how applications should be designed. It also provides bi-directional data circulation and updates the actual document object model.

· Modules

Angular comprises varying design patterns such as directives, components, services, and pipes, facilitating the seamless generation of applications.

· Dependency Injections

Components reliant on the other elements can be worked around quickly with the help of this feature.

  • Additional generic features include:
  • Maintainable and clean code
  • Data binding
  • Great responsive experience
  • Reusable elements
  • Unit testing

8. Explain some of the New Updates with Angular10

Support for older versions of Typescript has been withdrawn. While previous Angular models supported TypeScript 3.6 to 3.8, Angular 10 only supports TypeScript 3.9.

Voluntary strict setting. Angular 10 provides a stringent project configuration once you generate a new workspace using the ng new command (ng new –strict)

Notifications on CommonJS imports. Logging of unspecified element names or property bindings in templates is enhanced to the error level, which was a warning before.

Angular ten comes with additional NGCC features with a program-oriented entry point locator.

Other new features include:

  • Advanced URL routing
  • Numerous bug fixes
  • Detracted APIs
  • Advanced default browser setup

9. Define Templates in Angular

Templates in Angular are written in HTML containing clear-cut Angular attributes and elements. When combined with the controller’s information and model, these templates are rendered further to offer the user a powerful view.

10. Which are Annotations in Angular?

Annotations in Angular facilitate the creation of an annotation collection. They are the metadata group in the class that illustrates the metadata library.

11. Define Directives in Angular

Directives are features that enable users to write distinct advanced HTML syntax to their apps. They apply when the Angular compiler meets them in the DOM. Angular supports three different types of directives which are:

  • Component Directives
  • Attribute Directives
  • Structural Directives

12. What are Components in Angular?

What are Components in Angular

Components are the standard building blocks of the UI in an Angular application. Each component is affiliated with a template and a subset of directives. An Angular application usually comprises a root component or the AppComponent that branches into other components to form a hierarchy.

13. What does the PipeTransform Interface Mean?

The interface obtains the input value and changes it into the preferred format using a () transform method. It facilitates the implementation of custom pipes.

import { Pipe, PipeTransform } from ‘@angular/core’;


 name: ‘demopipe’


export class DemopipePipe implements PipeTransform {

 transform(value: unknown, …args: unknown[]): unknown {

  return null; }

14. What are Pure Pipes?

Pure pipes are the models that utilize pure functions. They don’t use any internal state, and the output is always the same so long as the parameters passed remain the same. Angular only calls the pipes once it senses any changes in the parameters getting passed. A single occurrence of a pure pipe is used across all components.

15. Define Impure Pipes

An impure pipe is called for each change detection in Angular regardless of the transformation at the input sections. Multiple pipe situations are generated for these pipes. Inputs flown to these pipes are mutable. All pipes are pure by default. However, you can designate impure pipes using the pure property illustrated below.


 name: ‘demopipe’,

 pure : true/false 


export class DemopipePipe implements PipeTransform {

16. Explain Pipes in Angular

Explain Pipes in Angular

17. What is a ngModule?

NgModules are packages that retain a block of code to a workflow or application domain. NgModule assumes a metadata object that illustrates how to compile a component’s template and facilitates the generation of an injector at run-time. Further, it establishes the module’s pipes, directives, and features and makes some public via the export property to ensure external elements can use them.

18. Define Filters in Angular and Name some of them

Filters facilitate the formatting of an expression and help deliver it to the user. They can be ideal in view templates, services, and controllers. Some of the built-in filters include:

  • date – configuration the date to the preferred format.
  • limitTo – limits a string or an array into a specific number of characters or elements
  • lowercase – layout a column into lowercase.
  • Json – configure an object into a JSON string.
  • filter – choose a subset of items from a collection

19. Define View Encapsulation in Angular

View encapsulation establishes whether the styles and template illustrated in the component can influence the entire application or vice versa. Angular offers three encapsulation plans which are:

  • Emulated – styles from the core HTML layer to the component.
  • None – styles from the component layer back to the core HTML, visible to all elements on the page.
  • Native – styles from the core HTML do not spread to the component.

20. What are Controllers?

AngularJS controllers regulate the data of AngularJS applications. The ng-controller directive describes the application controller.

21. Describe Scope in Angular

Scope in Angular secures the HTML that is the JavaScript (controller) and the view. It is an element with the available properties and methods. The scope is available in the controller and view. By executing a controller in Angular, you make the scope object an argument.

22. Illustrate Lifecycle Hooks in Angular

Illustrate Lifecycle Hooks in Angular

Every component in Angular comes with a lifecycle. Angular generates and renders components and demolishes them before eliminating them from the DOM. This process is accomplished through the help of lifecycle hooks. Here are some elements you should know.

  • ngOnInit() boots the component or directive after Angular first illustrates the data-bound components and configures the component or directive input components
  • ngOnChanges() responds when Angular resets and sets data-bound input properties
  • ngDoCheck() detects and operates on changes that Angular can identify independently
  • ngAfterContentChecked() responds once Angular evaluates the content predicts into the component.
  • ngAfterContentInit() responds once Angular predicts external content into the element’s view.
  • ngAfterViewInit() responds once Angular boots the component’s and child views
  • ngAfterViewChecked() responds when Angular evaluates the components and child views
  • ngOnDestroy cleans up just before Angular damages the component or directive

23. What are some Salient Features of Angular 7

Unlike the preceding models, Angular 7 features splitting in @angular/core to reduce the size. Worth noting is that developers don’t require all modules. As a result, each section of the @angular/core comes with over 418 modules. Further, Angular 7 features virtual and drag and drop scrolling.

Virtual resources facilitate the loading and unloading of components from the Document Object Module. The most advanced version of Angular features the virtual scrolling package. Angular seven also comes with an advanced ng-compiler version.

24. Describe Angular Authentication and Authorization?

User login details are transmitted to an authenticate API available on the server. Post-server-side credential validation, a JSON Web Token (JWT) is returned. The JWT has attributes or data about the current user, and the user is then recognized with the available JWT.

This process is referred to as authentication. After logging in successfully, each user gets a different access level. While some can access all the details, others may have limited access. The access level a user receives is called authorization.

25. Explain the Difference Between Backbone.js and Angular

Here are some of the tangible differences between Backbone.js and Angular.

· Architecture

Backbine.js leverages the MVP architecture without providing any data binding mechanism. Conversely, Angular runs on the MVC architecture and leverages two-way data binding to execute application activity.

· Community Support

The angular framework is Google-based, boosting its community support. Further, comprehensive documentation is available. While Backbone.js enjoys considerable support, it documents on Underscore.js templates only.

· Data Binding

Angular leverages two-way binding procedure m, making it slightly complex. Backbone.js, on the other hand, has no data binding procedure, making its API simple.


The core Angular JS focus is valid HTML and dynamic components. These features replicate the primary data for restructuring the Document Object Model based on the laid down rules before working on the updated information records. Backbone.js relies on the direct DOM manipulation concept for data representation and application structure changes.

· Performance

Due to its two-way data binding capability, Angular provides impressive performance for large and small projects. Backbone has a considerable advantage performance-wise over Angular in small web pages or data sets. Still, it’s not approved for large data sets or web pages due to the lack of the data binding procedure.

· Templating

Angular supports templating through solid HTML attributed. These are included in the document to form an easily understandable app at a performance level. Backbone.js leverages Underscore.js templates, which are not feature-packed as Angular templates.

· The Test Approach

The test approach between Backbone.js and Angular varies. Backbone.js works best for building small applications of webpages, while Angular is ideal for developing massive applications.

Unit testing is recommended in Angular, and the evaluation process is smoother across the framework. Backbone.js’ lack of data binding in Backbone.js facilitates a swift testing experience for small applications and a single page.

· Type

Angular is a JS-oriented open-source front-end web application framework that features new HTML attributes. Backbone.js, on the other hand, is a Light JavaScript library that features an MVP framework and a RESTful JSON.

26. What is String Interpolation in Angular?

String interpolation is a single-way data binding process that discharges from TypeScript code to HTML view. It is defined with curly braces. These template JavaScript expressions facilitate data display from the component to the view.

27. Define Template Statements?

Template statements are methods or properties used in HTML to respond to user events. Using template statements, applications that developers generate can help engage users through various actions like illustrating effective content and introducing forms. For instance:

<button (click)=”deleteHero()”>Delete hero</button>

DeleteHero, in this case, is the template, and the method will be called immediately users click on the button.

28. Explain the Difference Between AOT and JIT?

AOT (Ahead of Time) compilation changes your code in the build time before your browser can download and run it. The process facilitates fast rendering to the browser. Add the –aot option with the ng serve or ng build command to describe AOT compilation.

The JIT (Just in Time) compilation procedure assembles computer code to machine code in run time or execution. It is also referred to as a solid compilation. JIT compilation is the default when developers run ng serve CLI or ng build commands.

29. What is the @Component Decorator?

Component Decorator

TypeScript class is used to generate components. This class is then furnished with the @component decorator, whose purpose is to acquire a metadata object that offers applicable data on the element.

The image above illustrates an App component, a refined TypeScript class furnished with the @Component decorator. The metadata item that the decorator accepts offers different properties such as selector and templateurl. The templateurl property indicates an HTML file describing what users can view on the application.

30. What are Services in Angular?

Services in Angular execute tasks used by different components. The tasks can be image and data fetching, database management, and network connections. They perform all the operational functions for the elements without rewriting code. A service can only be written once and administered into all the aspects that utilize it.

31. Define Promises and Observables in Angular?

Both observables and promises deal with asynchronous practices in Angular. However, observables manage a series of asynchronous events over time, while promises manage one asynchronous separately.

Promises implement immediately after generation and cannot be canceled. Observables are only executed with the subscribe () technique once. They facilitate operations such as forEach, retry, and filter. They distribute errors to subscribers. The user will no longer receive additional values once the unsubscribe () approach is called.

32. What are the Recognizable Types of Angular Filters?

Filters form part of Angular that helps format the expression value to display it. They can be incorporated into templates, directives, services, or controllers. Developers can create customized filters based on the requirements. These filters facilitate better data organization, ensuring that data that meets the suitable criteria is displayed. Filters fall under the pipe symbol when used in expressions. Some of the filters in Angular include:

  • It chooses a sub-group containing objects from the required collection.
  • It changes numbers to currency format.
  • It changes the disposed of string into lowercase
  • it transforms a date into the relevant format
  • It changes the disposed of series into uppercase
  • it formats objects into JSON strings through the available expression
  • It changes a number value to form a string
  • LimitTo: It limits a collection or line to a specific number of strings or components.
  • Order by. It arranges collection

33. What is the Difference Between AngularJS and Angular?

Difference Between AngularJS and Angular

There are many differences between AngularJS and Angular which include:

· Architecture

Angular relies on directives and components, while Angular is based on the MVC design model. The Model comprises the business logic while the Controller processes data. The View displays the data.

· Dependency Injection

While AngularJS does not back dependency injection, Angular relies on a ranked dependency injection with bi-directional tree-oriented change detection.

· Expression Syntax

Angular leverages [] and () for the event covering and acquiring property binding. In AngularJS, a specific ng directive is needed for the property or image and an event.

· Mobile Support

AngularJS lacks mobile support, unlike Angular, which has.

· Recommended Language

While TypeScript is the recommended language for Angular, JavaScript is ideal for AngularJS.

· Routing

Angular leverages @RouteConfig{(…)} for routing while AngularJS uses $routeprovider.when()

· Speed

Angular comes with advanced features making it fast. On the other hand, development time and effort are highly reduced due to the two-way data binding support available in AngularJS.

· Structure

Angular comes with a simple structure, easing massive applications’ creation and maintenance. AngularJS’ design, on the other hand, is less manageable.

· Support 

Angular enjoys active support and regular updates. However, there are no updates or official support available for AngularJS.

34. Define ngOnInit

ngOnInit is a callback and lifecycle technique run by Angular to show that a component has been developed. It has no parameters and often generates a void type. Here is an example:

export class MyComponent implements OnInit {

  constructor() { }

  ngOnInit(): void {


35. How do you use ngFor as a Tag?

The ngFor directive is ideal for developing tables and lists in the HTML templates. This directive iterates over an object ir an array and generates a template for every element.

36. Explain Reactive and Template Forms

The reactive form concept is the programming model around the propagation of change and data flows.

· Reactive forms are code-oriented

Reactive forms eradicate the anti-practice of upgrading the data model through two-way data binding.

In reactive forms, the component controls data flows directly between data models and the form controls.

Reactive form control generation iS synchronous. It can be unit tested using synchronous programming practices.

Reactive forms separate from the conventional declarative approach

· Template-Driven Concept

In this approach, the traditional form tag helps generate forms. Angular creates and interprets a form object illustration for the title automatically.

Standard HTML validations can be used to verify the form fields. Directives can be utilized in the custom validations approach.

A form value in this concept can be created with the form value object. Form data is transmitted as JSON values once the submitting technique is called.

Controls can be included in the form through the NGmodel tag. Multiple commands can be classified through the NGControlGroup module.

This concept is the most straightforward strategy for creating an Angular App.

37. Explain Eager and Lazy Loading

Eager is the default module loading technique. Feature modules dependent on eager loading are executed before the application initiates. This technique is ideal for small size apps. Lazy loading runs the feature modules when the need arises, accelerating the application. It is suitable for larger applications where modules are not necessary at the beginning of the application.

38. What Form of Document Object Module does Angular Implement?

DOM handles an HTML or XML document as a tree structure where every Node is an object illustrating a document section. Angular leverages the ordinary DOM, which updates the whole tree architecture of HTML tags until it achieves the data that should be updated. To ensure the performance and speed are not affected, Angular effects Change detection.

39. Define Bootstrap

Angular bootstrapping allows professionals to launch an Angular application. Angular supports both automatic and manual bootstrapping. Here are more details about the two terms.

Manual bootstrapping offers professionals more control on when and how to launch the Angular app. This process is ideal for professionals who wish to execute other operations and tasks before Angular compiles the page.

· Automatic Bootstrapping

Developers can utilize automatic bootstrapping to include the ng-app directive to the app’s root, usually on the tag if they want Angular to bootstrap the app automatically. Angular loads the affiliated module to identify the ng-app directive and further compiles the DOM.

40. Name the Technologies used in Angular?

Angular is a Google-based modern JavaScript frontend framework. Angular relies on various technologies to achieve specific tasks with ease and give developers a better user experience when using it.

Angular leverages TypeScript, a JavaScript superscript. With TypeScript, developers can write JavaScript as a strong language. Angular also uses RxJS, which enables users to handle asynchronous operations better.

41. Name some Disadvantages of Using Angular?

Achieving excellent SEO results from an Angular app is tricky and requires configuration.

Angular can add weight to a JavaScript bundle. As a result, using it for small projects is not ideal.

Angular has numerous features packed together. Understanding each segment and how to utilize them can be a daunting task.

42. What is the Difference Between Angular and jQuery?

While Angular is a front-end JavaScript framework, jQuery is a JavaScript library. Other differences between the two include:

  • Form validation is absent in jQuery but present in Angular
  • Angular provides two-way data binding, but jQuery does not
  • jQuery does not offer deep linking routing, but Angular does
  • jQuery offers zero support for RESTful API, but Angular does

jQuery and Angular have various similarities despite their differences. For example, both Angular expressions and jQuery comprise literals, operators, and variables.

43. What is an Angular service worker?

The angular service worker is a script that operates in a browser and controls caching for an application. It offers an excellent user experience with reliability and performance. It functions as a network agent that stops all HTTP requests and determines how to counter them.

It can respond to a cache request when it’s available. The server worker is saved once the user shuts down the tab. When the browser loads subsequent applications, the service worker loads and counters all requests without the need for the network.

44. What are some Angular 9 Advanced Features?

Angular 9 is a recently launched and advanced framework covering Platform updates, Angular material, CLI, and the Angular framework. It comes with a wide range of features, as seen below.

  • Project Ivy is a new run-time and compiler that Angular 9 based apps will utilize by default.
  • Additional advanced options for Providein to discharge the services. These options include any platform
  • An alternative method to assessing the Component Harnesses
  • Using Google maps and YouTube within your application
  • ng update is reliable and informative. It utilizes the latest CLI, seamless update debugging, and clear progress update automatically
  • Offering support for TypeScript 3.7
  • Enhancements in language service and IDE (Integrated Development Environment)

45. Define Project Ivy in Angular 9 and its Advantages?

Ivy is the code word for Angular’s high performance rendering and compilation pipeline. The new run-time and compiler guidelines are utilized by default instead of View Engine, the former run-time, and compiler.

  • Ivy compiler produces less code for every Angular component by eliminating the additional code that’s not in use through tree-shaking
  • Improved debugging
  • TestBed implementation has been advanced in Angular 9, accelerating the testing process.
  • Style binding and CSS class enhancements
  • Build time enhancements
  • Type checking advancements
  • Improvement of the AOT compiler
  • Build errors enhancements
  • Internationalization enhancements

46. What New Options are there for ProvidedIn in Angular 9?

Angular services are integrated into the injector through the @Injectable decorator. Angular 9 is the provider of two additional options to integrate the services with different options, which are:

· Any

When you want unique situations in each module, you can designate provideIn: any.

· Platform

When all applications on a specific page share a unique independent platform injector and developers want a service to appear there, you can designate provideIn: platform.

What are the Best Angular Interview Books?

Reading is an excellent way of improving your Angular knowledge. Here are some of the best Angular interview books you can consider.

1. Angular Projects: Build Modern Web Apps by Exploring Angular 12

This book is one of the most effective options to learn Angular 12. It allows you to learn and understand how to develop structured and optimized web applications by combining Angular 12 with other technologies. Through this book, learners will work on ten varying real-world apps like:

  • Building a personal blog using SPA (Single Page Application) and Jamstack techniques
  • Converting web pages into SEO friendly sites
  • Developing desktop apps using Electron and Angular
  • Extending Angular CLI to build custom schematics
  • Angular Projects takes a project-oriented approach

2. Angular Cookbook

Angular Cookbook

Angular Cookbook comes with more than 90 recipes that will help you develop enterprise-level Angular development proficiency. This book is among the best options available to help you master Angular recipes. Angular Cookbook allows you to evaluate industry best practices and boost your Angular expertise. Some of the components that you will learn are:

  • Using Angular to generate PWAs (Progressive Web Applications)
  • Leveraging NgRx for state management deployment or Angular applications
  • Leveraging RxJs to regulate your application’s reactivity
  • Developing and incorporating animations in your Angular applications

3. Angular Development with TypeScript

Angular Development with TypeScript is an intermediate-level book that helps readers understand how to develop web applications using TypeScript and Angular. It leverages samples in Angular 7,6 and 5 to illustrate the following.

  • Reactive programming
  • Dependency injection
  • Angular Forms API

When developing a full-featured auction application, developers will discover Angular concepts such as:

  • Data
  • State management
  • For,s
  • Server communication

4. ng-book: The Complete Book on Angular 6, 5th Edition

Ng-book is an excellent book that helps you learn and understand Angular 6. It takes a comprehensive approach to help readers master the components of Angular 6. Readers will begin by developing their first Angular app before advancing to intermediate and advanced topics like:

  • Inbuilt directives
  • Dependency injection
  • Routing
  • Advanced components
  • Data architecture

Readers will learn essential best practices and Angular concepts through numerous real-world apps such as:

  • Component oriented Reddit clone
  • Spotify search for tracks
  • YouTube search as you type application

5. Angular for Enterprise-Ready Web Applications

Angular for Enterprise-Ready Web Applications

Angular for Enterprise-Ready Web Applications is ideal for developers with experience in RESTful APIs. This book helps you understand how to develop production-worthy Angular applications from the design phase to deployment. During this process, developers will explore the following:

  • Basics when utilizing CLI tools, RxJs, Docker, and GitHub
  • Implementation of RESTful APIs using MongoDB, Express, and Node
  • ngRx
  • Application deployment on the cloud infrastructure

6. ASP.NET Core 5 and Angular

ASP.NET Core 5 and Angular are ideal for ASP.NET developers. The book covers web development with Angular 11 and .NET 5. You will start by learning how to design, develop, and deploy SPAs (Single Page Applications) or PWAs Progressive Web Apps). You will then leverage the complete stack concept to manage:

  • Web APIs
  • Data management
  • Application design
  • SEO
  • Testing
  • Deployment
  • Security

You will also gain practical skills as you execute advanced debugging and study the unit testing attributes.

  • The revised edition of ASP.NET Core 5 and ANgular covers:
  • The Angular routing module
  • Application deployment on Linux, Windows, and Azure
  • Angular CLI

7. Testing Angular Applications

Testing Angular Applications is an interactive book that gives readers practical techniques to test their Angular applications. While learning the basics of Angular, readers will configure a manageable unit testing system. Through this book, you will learn:

  • Writing and debugging
  • TypeScript
  • Developing continuous integration for your testing collection

After reading Testing Angular Applications, you should write end-to-end and unit tests for Angular applications in TypeScript.

8. Learning Angular

Learning Angular

Learning Angular is an excellent book for learning Angular 10. It is a beginner’s guide to developing web applications with Angular 10. Readers will begin by analyzing the fundamentals of Angular, like templates, components, services, and forms. They will then learn about:

  • The Angular CLI
  • Industry best practices
  • Methods to ensure Angular components interact with one another

This book is one of the best options for developers who want to master the essential components of Angular and develop a robust foundation.

9. Angular: Up and Running

Angular: Up & Running is ideal for readers who want to pursue Angular 2. It may not be the best option for Angular beginners, but you can choose it if your team utilizes Angular 2. Readers will begin by developing a manageable Angular application. They will then learn how to:

  • Configure their development environment
  • Make HTTP calls
  • Create and test Angular components
  • Use Angular inbuilt services
  • Implement a performant Angular application

After reading the book, you should be able to develop applications with Angular.

10. Angular in Action

Angular in Action is a practical tutorial that will teach readers how to develop web applications in Angular. It comes with tricks and tips to help you deliver effective apps in record time. After completing your first application, you will discover:

  • A wide range of Angular features
  • Example projects
  • Debugging and testing techniques
  • Large application management techniques

11. Pro Angular 9: Build Powerful and Dynamic Web Apps

Build Powerful and Dynamic Web Apps

Pro Angular 9 is an excellent book that features online documentation for Angular 11 and 10. The book is a full-color guide that covers the basics of Angular 11, 10, and 9. Readers will begin with an outline of the Model View Controller pattern. They will then learn how to start integrating Angular in their projects. After reading this book, readers should be able to:

  • Build dynamic and rich web applications using Angular
  • Extend and customize Angular
  • Utilize the ng tools to design and develop Angular projects
  • Unit test their Angular projects

12. Beginning Angular with Typescript

Beginning Angular with TypeScript is a practical journey to help readers learn and master Angular from a web development perspective. The book is easy to understand, and readers can start developing web applications after minutes of reading it. The lessons in this book include:

  • Bindings
  • Developing and utilizing components
  • Routing
  • Model-based forms and templates
  • Authentication and CRUD using Firebase

13. Angular: From Theory to Practice

Angular: From Theory to Practice starts readers off by writing their first Angular application. They will learn the following Angular features.

  • Binding and components
  • Directives
  • Routing and SPAs
  • Angular CLI
  • Dependency injection


Whether you are a beginner or experienced in the Angular world, these books can help you improve your skills and experience. If you are an employer, these questions should help you understand what you need to hire an Angular developer now.