Top 25+ Angular Interview Questions | AnalyticsJobs

Introduction to Angular Interview Questions and Answers

Angular is a framework and platform that allows you to create single-page client apps in HTML and TypeScript. TypeScript is used to write Angular. It provides essential and optional functionality as a collection of TypeScript libraries that you can incorporate into your apps.

An Angular application’s architecture is based on a few key ideas. The Angular framework’s fundamental building pieces are Angular components arranged into NgModules. NgModules group together similar code to form functional sets; an Angular application is defined by a collection of NgModules. An application always contains at least one root module that facilitates bootstrapping, and many more feature modules are common.

• Components define perspectives, which are collections of screen components that Angular may choose and alter based on your program logic and data.
• Components make use of services, which provide functionality that is not directly connected to views. Service providers may be injected as dependencies into components, making your code modular, reusable, and efficient.

In today’s digital spaces, businesses are always looking for methods to differentiate themselves from the competitors. Web and mobile applications have become a must-have and efficient marketing tool for any successful organization. 

Let’s check out the most frequently asked Angular Interview Questions and their answers.

Angular Interview Questions For Freshers

What specifically is Angular? How much do you know about Angular?

Angular is a prominent JavaScript framework created and maintained by Google. It is a TypeScript-based open-source front-end web framework. Because its code is reusable and maintainable, it is best suited for designing business web applications.

The interviewer can ask you these Angular Interview Questions to check your knowledge of Angular basics.

What is the Primary Goal of Angular?

The primary goal of utilizing Angular is to develop online apps that are quick, dynamic, and scalable. We may simply develop similar apps with Angular by utilizing components and directives.

Angular began as a SPA (Single-Page-Application) framework, but it now offers dynamic content depending on various users via dependency injection. It provides a framework for the rapid development of web-based apps and empowers front-end developers in the creation of cross-platform applications.

YouTube TV is the most well-known application that makes use of Angular. The interviewer can ask you these Angular Interview Questions to check your in-depth knowledge of Angular. These are also among Angular Interview Questions and Answers for Freshers.

What are the Principal Advantages of Angular?

The following is a list of the most significant benefits of utilizing the Angular framework:

• Angular allows for two-way data binding.
• It adheres to the MVC pattern design.
• It supports both static and Angular templates.
• It makes it easier to add a custom directive.
• RESTful services are also supported.
• Validations are possible with Angular.
• Angular supports client-server communication.
• It allows for dependency injection to be used.
• It has significant features such as Event Handlers, Animation, and so on.

The interviewer can ask you these Angular Interview Questions to check your knowledge regarding the advantages and tangible benefits of Angular. These are also among Angular Interview Questions and Answers for Freshers.

Why were client-side frameworks such as Angular created?

Previously, web developers utilized VanillaJS and jQuery to create dynamic websites, but as the logic of a website developed, the code became increasingly difficult to maintain. Developers had to work extra hard to keep the app’s separation of concerns when it used complicated logic. Furthermore, jQuery did not provide data management across views.

Client-side frameworks like Angular came into play to address the aforementioned issues, making life simpler for developers by managing separation of responsibilities and splitting code into smaller chunks of information (In the case of Angular, called Components). The interviewer can ask you these Angular Interview Questions to check your knowledge of Angular components. These are also among Angular Interview Questions for Freshers.

What specifically are templates in Angular?

Templates in Angular contain Angular-specific components and properties. These are written in HTML and mixed with data from the model and controller, which is then displayed to offer the user a dynamic view.

The interviewer can ask you these Angular Interview Questions to check your knowledge of Angular templates and components. These are also among Angular Interview Questions for Freshers.

In Angular, what is the relationship between an Annotation and a Decorator?

Annotations are the “only” metadata set of the class in Angular when utilizing the Reflect Metadata library. They are employed in the construction of an “annotation” array. 

On the other hand, decorators are design patterns that are used to separate decoration or modification of a class without actually affecting the underlying source code.

The interviewer can ask you these Angular Interview Questions to check your knowledge of Angular components like Annotation and Decorator. These are also among Angular Interview Questions for Freshers.

What is the functionality of an Angular application?

Each Angular app includes a file called angular.json. This file includes all of the app’s settings. The builder consults this file while creating the app to determine the application’s entry point. The following is the structure of the angular.json file:

“build”: {  

  “builder”: “@angular-devkit/build-angular:browser”,  

  “options”: {  

    “outputPath”: “dist/angular-starter”,  

    “index”: “src/index.html”,  

    “main”: “src/main.ts”,  

    “polyfills”: “src/polyfills.ts”,  

    “tsConfig”: “tsconfig.app.json”,  

    “aot”: false,  

    “assets”: [  

      “src/favicon.ico”,  

      “src/assets”  

    ],  

    “styles”: [  

      “./node_modules/@angular/material/prebuilt-themes/deeppurple-amber.css”,  

      “src/style.css”  

    ]  

  }  

}  

When the program enters the build section, the main property of the options object determines the application’s entry point. The program’s entry point is main.ts, which establishes a browser environment in which the application may execute and runs the bootstrap module method, which leads to a good application. The interviewer can ask you these Angular Interview Questions to check your knowledge of Angular Application. These are also among Angular Interview Questions for Freshers.

What are some of the benefits of using Angular over other frameworks?

Out-of-the-box features – Angular comes with a variety of built-in capabilities like routing, state management, the rxjs library, and an HTTP service. This implies that the aforementioned qualities do not need to be sought individually. They are all supplied with an angular.

• Declarative UI – Angular renders an application’s UI using HTML. HTML is a declarative language that is far more user-friendly than JavaScript.
• Google’s long-term support for Angular – Google has announced long-term support for Angular. This suggests that Google intends to continue with Angular and expand its ecosystem. 

The interviewer can ask you these Angular Interview Questions to check your knowledge of some of the benefits of using Angular over other frameworks. These are also among Angular Interview Questions for Freshers.

Angular Interview Questions For Intermediate:

What precisely is AOT in Angular?

AOT is an abbreviation for Ahead-Of-Time compiler in Angular. It is used during the build process to turn your Angular HTML and TypeScript code in and out of efficient JavaScript code just before browser downloads and runs that code. Compiling the program during the build process allows for quicker browser rendering.

The interviewer can ask you these Angular Interview Questions to check your knowledge of AOT in Angular Application. These are also among Angular Interview Questions for Intermediate.

What is the purpose of Angular’s use of the AOT compiler?

An Angular application is made up of many components and HTML templates. Browsers are unable to grasp these Angular components and templates because of them. As a result, Angular applications must be compiled before they can be executed in a browser. As a result, AOT compilers are necessary. The interviewer can ask you these Angular Interview Questions to check your knowledge and use of AOT Compiler in Angular Application. These are also among Angular Interview Questions for Intermediate.

What are the main advantages of AOT in Angular?

The following are some of the benefits of utilizing the AOT compiler in Angular:

• Rendering is faster: When we utilize the AOT compiler, the browser receives a pre-compiled version of the program to download. In this case, the browser loads executables to create the program immediately, rather than waiting for it to be compiled first.
• The Angular framework has a reduced download size: If the app has already been built, AOT allows you to avoid downloading the Angular compiler. Because the compiler is nearly half the size of Angular, removing it drastically decreases the application payload.
• There are fewer asynchronous requests: The compiler is often used to inline external HTML templates and CSS style sheets into the JavaScript application, hence eliminating the need for separate AJAX queries for those source files.
• Find template mistakes earlier: With the AOT compiler, developers may rapidly identify and report template binding flaws during the build process, before users see them.
• Better security: AOT improves security by compiling HTML templates and components into JavaScript files before serving them to the client. Because there are no templates to read and no dangerous client-side HTML or JavaScript evaluation, injection attacks are extremely unlikely.

The interviewer can ask you these Angular Interview Questions to check your knowledge and the main advantages of AOT in Angular Application. These are also among Angular Interview Questions for Intermediate.

What specifically is JIT in Angular?

JIT is an abbreviation for Just-in-Time compiler in Angular. The JIT compiler offers dynamic translation or run-time compilation, which is a method of implementing computer code that incorporates compilation during program execution rather than before. The interviewer can ask you these Angular Interview Questions to check your knowledge of JIT on the Angular platform. These are also among Angular Interview Questions for Intermediate.

What is the main differentiation between JIT and AOT in Angular?

The following are the primary distinctions between Angular’s JIT and AOT compilers:

A Just-in-Time (JIT) processor compiles our software in the browser at run-time, whereas an Ahead-of-Time (AOT) compiler compiles your app on the server at build time. When you run the ng build (build only) or ng serve (build and serve locally) CLI commands, JIT compilation is enabled by default. This is for development purposes. For AOT compilation, however, we must specify the —aot option with the ng build or ng serve command.

JIT and AOT are two methods for compiling code in an Angular project. In development mode, a JIT compiler is utilized, but in production mode, an AOT compiler is used.

JIT is simple to use. We can quickly implement and debug features in JIT mode since we have a map file, but AOT does not. The main advantage of adopting AOT for production, on the other hand, is that it minimizes bundle size for faster rendering.

The interviewer can ask you these Angular Interview Questions to check your knowledge of the differences between JIT and AOT in Angular features. These are also among Angular Interview Questions for Intermediate.

What is the scope hierarchy notion in Angular?

Angular helps organize the $scope objects into a hierarchical structure that is commonly utilized by views. In Angular, this is referred to as the scope hierarchy. It contains a root scope that can include one or more scopes known as child scopes.

Each view in a scope hierarchy has its own $scope. As a result, variables defined by a view’s view control system are hidden from other view controllers.

 For example:

Root $scope  

$scope for Controller 1  

$scope for Controller 2  

…  

..  

.  

$scope for Controller n  

The interviewer can ask you these Angular Interview Questions to check your knowledge of scope and hierarchy notion in Angular Application. These are also among Angular Interview Questions for Intermediate.

What are the key elements of an Angular application? Describe Angular architecture via a graphical representation.

The following are the major components of an Angular application. They are depicted in the following image:

The interviewer can ask you these Angular Interview Questions to check your knowledge of key elements in Angular Application. These are also among Angular Interview Questions for Intermediate.

Why use Angular vs AngularJS?

Angular in angular vs angularJS is a popular framework for developing online and mobile apps, and it may be ideal for creating large-scale, powerful, and easy-to-use web applications. The following is a list of reasons why you should use Angular:

• Safety: Because it is maintained by Google, Angular is a pretty reliable platform.
• Development time is cut in half: By converting templates into code, Angular relies on the existing JavaScript virtual engine. The load time of Angular is also quick.
• Friendly to unit tests: Two-way data binding of modules and components is a feature of Angular that makes the code consistent and easy to comprehend for unit testing. Throughout the app development process, every unit of code is independently checked, ensuring thorough quality control.
• Cross-platform: PWAs built with Angular may operate on a broad range of devices, and the framework is extensively utilized in native mobile apps. Previously, frontend developers utilized an Ionic and Angular cross-platform combination. Its most frequent pairing nowadays is with NativeScript.
• The learning curve is rather complicated: The learning curve for Angular is substantially harder than for other frameworks. To get started, you should look at all parts of the framework, not just fundamental JavaScript, such as RxJS (a reactive library for asynchronous programming) and Typescript (used to improve maintainability and code support capabilities).
• Community: Angular offers a wonderful community and environment that is well-supported. There is a lot of information on the framework, including instructions and videos, as well as a number of third-party tools.

With all of its benefits, Angular in angular vs angularJS isn’t a one-size-fits-all answer for every assignment, and that’s fine. Every technique is ideally adapted to solving certain problems, and other approaches will be better appropriate for other jobs. It’s simple to utilize Angular to develop a project, but it’s more difficult to determine whether this solution is truly useful or worthwhile.

 The interviewer can ask you these Angular Interview Questions to check your knowledge and use  on Angular Vs AngularJS in Angular Application. These are also among Angular Interview Questions for Intermediate.

Difference Between Angular vs AngularJS

Let us look at Angular vs AngularJS differences in key features:

The interviewer can ask you these Angular Interview Questions to check your knowledge and use  on Angular Vs AngularJS in Angular Application. These are also among Angular Interview Questions for Intermediate

Angular Interview Questions for Advanced:

What specifically is Angular CLI?

The acronym Angular CLI stands for Angular Command Line Interface. It’s a command-line tool for scaffolding and building Angular apps with Node.js style modules.

To utilize Angular CLI, we must first install it using the npm command:

 List of some useful commands which would be very helpful while creating angular projects:

The interviewer can ask you these Angular Interview Questions to check your knowledge of Command and tools in Angular Application. These are also among Angular Interview Questions for the Advanced level. 

Creating New Project: ng new

Generating Components, Directives & Services: ng generate/g

Running the Project: ng serve

What is Angular lazy loading?

Lazy loading is one of the most effective and helpful Angular Routing features. It makes online pages easier to download by downloading them in pieces rather than downloading everything at once. Lazy loading allows you to load the feature module asynchronously for routing whenever you need it by utilizing the loadChildren attribute.

const routes: Routes = [  

  {  

    path: ’employees’,  

    loadChildren: () => import(‘./employees/employees.module’).then(module => module.EmployeesModule)  

  },  

  {  

    path: ‘orders’,  

    loadChildren: () => import(‘./orders/orders.module’).then(module => module.OrdersModule)  

  },  

  {  

    path: ”,  

    redirectTo: ”,  

    pathMatch: ‘full’  

  }  

The interviewer can ask you these Angular Interview Questions to check your knowledge on Lazy loading in Angular Application. These are also among Angular Interview Questions for Advanced level. 

What specifically is an Angular Router?

The Angular Router is a system that allows users to go from one view to the next while doing application operations. It adheres to the browser’s application navigation idea paradigm. The interviewer can ask you these Angular Interview Questions to check your knowledge onAngular Router and its operations in Angular Application. These are also among Angular Interview Questions for Advanced level. 

What particularly do you mean by router imports?

The Angular Router, which represents a specific component view for a given URL, is not included in Angular Core. It is provided in the @angular/router library, and we must import the necessary router components. This is known as router imports. See the example below for how we may import them into the app module:

import { RouterModule, Routes } from ‘@angular/router’;

The interviewer can ask you these Angular Interview Questions to check your knowledge on Router Imports in Angular Application. These are also among Angular Interview Questions for Advanced level. 

Angular apps are designed to use client-side rendering by default. Is it possible to create an Angular application that renders on the server?

Yes, an Angular application can be made to render on the server side. Angular Universal is a technology provided by Angular that may be used to render apps on the server side.

The following are the key benefits of adopting Angular Universal:

Making an Angular application render on the server can improve the user experience. This allows first-time users to see a glimpse of the programme right away. As a result, it may be leveraged to create a better UI. The interviewer can ask you these Angular Interview Questions to check your knowledge of rendering on servers in Angular Applications. These are also among Angular Interview Questions for the Advanced level. 

What specifically do you mean by services in Angular?

Services in Angular are singleton objects that are instantiated only once during an application’s lifetime. An Angular service includes methods for storing data during the life of an application. Angular services are used to structure and communicate business logic, models, data, and functions with multiple Angular application components.

Angular services provide some functions that can be called from an Angular component like a controller or directive. The interviewer can ask you these Angular Interview Questions to check your knowledge of services and methods in Angular Applications. These are also among Angular Interview Questions for the Advanced level. 

What generally do you mean by Angular Material?

Professionals utilize Angular Material, a UI component framework, to create a uniform, appealing, and fully functioning websites, web pages, and online apps. It adheres to contemporary web design concepts such as gentle deterioration and browser possibility and is capable of performing a variety of intriguing tasks in website and application development. The interviewer can ask you these Angular Interview Questions to check your knowledge of Angular Material in Angular Application. These are also among Angular Interview Questions for the Advanced level. 

In Angular, when do we need a directive?

If you are creating an Angular application with numerous components that require comparable functionality, you must add this functionality to each component manually. This is not a simple process. To deal with this problem, directives are employed. Here, we may write a directive with the necessary functionality and then import it into components that require it. The interviewer can ask you these Angular Interview Questions to check your knowledge of directive components in Angular Application. These are also among Angular Interview Questions for the Advanced level. 

In Angular, what are string interpolation and property binding?

Data-binding in Angular includes string interpolation and property binding. Data-binding is an Angular feature that allows you to interact between the component (Model) but also its view (HTML template). Data binding may be done in two ways: one-way data binding and two-way data binding. Data from the components may be injected into the HTML template in Angular. In one-way binding, any changes to the component will be reflected immediately inside the HTML template, but vice versa is not feasible.

It is, nevertheless, conceivable in two-way binding. One-way data binding is demonstrated using string interpolation and property binding. They only support one-way data binding. The interviewer can ask you these Angular Interview Questions to check your knowledge of string interpolation and property binding in Angular Applications. These are also among Angular Interview Questions for the Advanced level. 

NOTE : You should also know about Amazon Data Scientist Interview Questions , Blockchain Interview Questions

Conclusion:

If you’re headed to an Angular interview, this expert-prepared list of Angular interview questions and answers is all you’ll need. This unique set of Angular interview questions is created for those professionals interested in learning about HTML and TypeScript.

There are several reasons why corporations choose Angular for creating large-scale, complex apps, and each firm will have a somewhat different range of arguments why the technology is so beneficial for their teams. It might be as basic as the Angular in TypeScript, seeming comfortable to someone who has substantial expertise with Java or.NET. Perhaps the sanity restored by employing component-driven design with sensible state management is exactly what the team requires, based on prior ventures into large-scale projects gone wrong.

There are many features that we have not even mentioned in this tutorial since, unless you are on the outskirts of an outlier use case, you will benefit from them without even thinking about it. For example, unless we need to perform anything really complex, we will probably never need to consider the new change-detection system that is three to five times quicker than AngularJS. We will almost certainly never need to touch hierarchical dependency injection and override it at the component level, but we might if necessary.

Most of us will never need to create our own bespoke Angular renderer, but it is doable and has been done. You can also check out a blog here Angular vs AngularJS.