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Some of the reasons as to why applications compiled with AOT launch faster are as follows -

• Application components that are compiled with AOT execute immediately, without the client-side compilation.
• Templates here are embedded as code within their components. Therefore, there is no client-side request for template files, MAKING it FAST.
• The compiler does not entertain the UNUSED Angular directives and therefore, GIVES a fast response.

As is evident from the above set of questions, Angular has a plethora of features that it has to offer to developers. This is the reason why Angular has been growing very rapidly and being used in the software industry.

Therefore, any budding developer of today, who is familiar with Angular, has a good chance of cracking technical interviews of various companies. In this article, we aimed at listing the famous interview questions on Angular 8 which we think are important and we hope we are successful in our endeavor!

ADDITIONAL Resource

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Angular Interview Questions

Angular Vs React

Difference Between Angular and AngularJS

Event BINDING is a technique that is USED in Angular 8 to handle the events RAISED from the Document Object Model (DOM), for instance, BUTTON clicks, mouse hovers, mouse moves, etc. When the DOM event happens, the specified method in the component is immediately called.

An example of event binding is given below -

<button (click)="raiseVolume()"></button>

 In this example, the raiseVolume() method from the component will be called when the button is clicked.

The NgModules in Angular 8 varies from other JAVASCRIPT modules. All Angular APPLICATIONS have at LEAST one module known as the AppModule. The NgModule gives us a bootstrap mechanism to launch different applications easily.

A few of the striking features of Angular 8 modules are as follows:

• The own functionality of the NgModule can be exported and can also be utilized by other NgModules.
• Angular 8 NgModule can import functionalities from other NgModules.

In Angular, there is a list of classes with decorators known as components that usually mark their own types. They provide metadata to HELP Angular do a LOT of things. Every application in Angular 8 has at least one component known as the root component, which is mostly used to CONNECT page hierarchy with page DOM.

String Interpolation is a one-way Data Binding Technique. It can be USED to extract the OUTPUT data from a TypeScript code to the HTML template VIEW LAYER. String Interpolation displays the data from the component to the view layer in the form of curly braces.

String interpolation technique adds the value of property to the component. An EXAMPLE of String Interpolation is shown below -

{{data}}

Data Binding can be best described as a technique that is used to link the application’s data to the view layer. It makes COMMUNICATION between the DOM (Document Object Model) and the TypeScript code of our component.

In other words, data binding is a communication between the typescript code of our component and our template, which is visible to the user. Data Binding allows us to define interactive APPLICATIONS easily and efficiently without worrying about pushing and PULLING data.

There are two types of data binding - 

• ONE-way data-binding: One-way data binding is used to bind the data from the component to the view (Document Object Model) or vice versa. One way data binding is a UNIDIRECTIONAL data binding method, that is, we can either bind the data from the component to the view or bind the data from the view to the component.
• Two-way data binding: Two-way data binding in Angular version 8 helps the users to exchange data from the component to the view and from the view to the component. Bi-directional communication is established in this method.

<P>The syntax of the ngIf Directive is given below

The usage of ngIf is described below -

It is a structural directive present in Angular Version 8 whose usage revolves around adding or removing HTML elements BASED on the expression statement. The functioning of this nglf directive is OBSERVED as follows: When the expression is true, the element is added and when the expression is false, the element is removed using this directive.

NgUpgrade is one of the upgrade libraries of ANGULAR version 8 which is mostly used to integrate both Angular and AngularJS components in an application. It also helps US in BRIDGING the GAP between the Dependency Injection Systems in both AngularJS and Angular.

We can CREATE an ANGULAR 8 application using the following command

ng new applicationName

To install the Angular CL, we can USE the following command

npm install -g @angular/CLI

Lazy loading is a feature of Angular which helps in bringing down the size of large files. This is accomplished by LAZILY loading the files that are to be used again and again.

Angular 8 provides support for dynamic imports in our router configuration. In other WORDS, we use the import statement for lazy loading of the module and this will be understood by the webpack, IDEs (Integrated DEVELOPMENT Environments), etc.

Syntax

Explanation

In the above code snippet, the loadChildren expects a function that uses the dynamic import syntax to import the lazy loaded module only when it is needed. As is evident from the above code snippet, the dynamic import is based on promises and gives us ACCESS to the module, where the module’s class can be called.

A few key parts of the Angular 8 architecture are as follows -

• Angular 8 MetaData - Metadata in Angular version 8 is used to decorate a class for the configuration of the expected behavior of the class.
• Angular 8 DataBinding - Data Binding is used to BIND the data from the component to the template.
• Angular 8 Components - Angular Components are building blocks of all Angular applications. Every angular application is made up of one or more Angular Components. It is basically a plain JavaScript or Typescript class along with an HTML template and an associated name.
• Angular 8 MODULES - It is a collection of related features. Angular 8 Module groups multiple components and services under a single context.
• Angular 8 Services - Services are nothing but plain and simple Typescript or JavaScript classes that provide very specific functionalities. They help us do a single task in the best possible WAY so that code reusability is ACHIEVED. Rather than writing a functionality inside a component, separating it into a service makes it reusable in other components as well.
• Angular 8 Templates - Angular 8 template is a superset of HTML (HyperText Markup Language). It includes all the features of HTML and gives us additional features to bind the component data into the HTML and to dynamically generate the HTML DOM ELEMENTS.