Angular Interview Questions for fresher (Frequently Asked)

Preparing for getting your dream job of an Angular developer? Or, simply planning to switch to being an Angular developer? In this article, we’re going to look at some of the frequently asked angular questions that you can expect to be coming your way during an Angular interview for the role of an Angular developer.
In addition to these concept-based questions, there will be a requirement for a (or maybe multiple) coding test(s). So, keep up your programming practice for the interview. If you wish to hone your Angular development skills further, here are some of the best Angular tutorials that can help you out.
Angular Interview Questions
So, ready to see how well your preparation is going? Without further ado, here we present you with some important Angular interview questions that you might expect in your interview. These questions are also valid for your Angular 6 interview questions.
Question: What is Angular?
Answer: Angular is a TypeScript-based open-source web application framework, developed and maintained by Google. It offers an easy and powerful way of building front end web-based applications.
Angular integrates a range of features like declarative templates, dependency injection, end-to-end tooling, etc. that facilitates web application development.
Question: Define the ng-content Directive?
Answer: Conventional HTML elements have some content between the tags. For instance:
<p>Put your paragraph here</p>
Now consider the following example of having custom text between angular tags:
<app-work>This won’t work like HTML until you use ng-content Directive</app-work>
However, doing so won’t work the way it worked for HTML elements. In order to make it work just like the HTML example mentioned above, we need to use the ng-content Directive. Moreover, it is helpful in building reusable components.
Know more about the ng-content directive.
Question: Please explain the various features of Angular.
Answer: There are several features of Angular that make it an ideal front end JavaScript framework. Most important of them are described as follows:
Accessibility Applications
Angular allows creating accessible applications using ARIA-enabled components, built-in a11y test infrastructure, and developer guides.
Angular CLI
Angular provides support for command-line interface tools. These tools can be used for adding components, testing, instant deploying, etc.
Animation Support
Angular’s intuitive API allows the creation of high-performance, complex animation timelines with very little code.
Cross-Platform App Development
Angular can be used for building an efficient and powerful desktop, native, and progressive web apps. Angular provides support for building native mobile applications using Cordova, Ionic, or NativeScript.
Angular allows creating high performance, offline, and zero-step installation progressive web apps using modern web platform capabilities. The popular JS framework can also be used for building desktop apps for Linux, macOS, and Windows.
Code Generation
Angular is able to convert templates into highly-optimized code for modern JavaScript virtual machines.
Code Splitting
With the new Component Router, Angular apps load quickly. The Component Router offers automatic code-splitting so that only the code required to render the view that is requested by a user is loaded.
Synergy with Popular Code Editors and IDEs
Angular offers code completion, instant errors, etc. with popular source code editors and IDEs.
Templates
Allows creating UI views with a simple and powerful template syntax.
Testing
Angular lets you carry out frequent unit tests using Karma. The Protractor allows running faster scenario tests in a stable way.
Question: Demonstrate navigating between different routes in an Angular application.
Answer: Following code demonstrates how to navigate between different routes in an Angular app dubbed “Some Search App”:
Question: Could you explain services in Angular?
Answer: Singleton objects in Angular that get instantiated only once during the lifetime of an application are called services. An Angular service contains methods that maintain the data throughout the life of an application.
The primary intent of an Angular service is to organize as well as share business logic, models, or data and functions with various components of an Angular application.
The functions offered by an Angular service can be invoked from an Angular component, such as a controller or directive.
Question: Discuss the advantages and disadvantages of using Angular?
Answer: Following are the various advantages of using Angular:
Ability to add a custom directive
Exceptional community support
Facilitates client and server communication
Features strong features, such as Animation and Event Handlers
Follows the MVC pattern architecture
Offers support for static template and Angular template
Support for two-way data-binding
Supports dependency injection, RESTful services, and validations
Disadvantages of using Angular are enumerated as follows:
Complex SPAs can be inconvenient and laggy to use due to their size
Dynamic applications do not always perform well
Learning Angular requires a decent effort and time
Question: Enumerate some salient features of Angular 7.
Answer: Unlike the previous versions of Angular, the 7th major release comes with splitting in @angular/core. This is done in order to reduce the size of the same. Typically, not each and every module is required by an Angular developer. Therefore, in Angular 7 each split of the @angular/core will have no more than 418 modules.
Also, Angular 7 brings drag-and-drop and virtual scrolling into play. The latter enables loading as well as unloading elements from the DOM. For virtual scrolling, the latest version of Angular comes with the package. Furthermore, Angular 7 comes with a new and enhanced version of the ng-compiler.
Question: What is string interpolation in Angular?
Answer: Also referred to as mustache syntax, string interpolation in Angular refers to a special type of syntax that makes use of template expressions in order to display the component data. These template expressions are enclosed within double curly braces i.e. {{ }}.
The JavaScript expressions that are to be executed by Angular are added within the curly braces and the corresponding output is embedded into the HTML code. Typically, these expressions are updated and registered like watches as a part of the digest cycle.
Question: Explain Angular Authentication and Authorization.
Answer: The user login credentials are passed to an authenticated API, which is present on the server. Post-server-side validation of the credentials, a JWT (JSON Web Token) is returned. The JWT has information or attributes regarding the current user. The user is then identified with the given JWT. This is called authentication.
Post-logging-in successfully, different users have a different level of access. While some may access everything, access for others might be restricted to only some resources. The level of access is an authorization.