Accenture Angular Interview Questions

Here is the list of Angular Interview Questions which are recently asked in Accenture company. These questions are included for both Freshers and Experienced professionals. Our Angular Training has Answered all the below Questions.

1. Why were client-side frameworks like Angular introduced?

Angular was designed to create dynamic web applications.It ensures building front-end-based apps without using any other plugins. To deliver the best web applications, Angular provides a lot of functionality and tools for organizing the work.

2. List some of the advantages of Angular over other frameworks?

Angular provides a lot of effective built-in features like

Templating.
Routing.
State management.
HTTP services.

Strongly typed language – Angular shortens the development time, increases the high performance,scalability, cost effectiveness and more.

3. What is Angular?

Angular is a platform and framework for building single-page client applications using HTML and TypeScript. Angular is written in TypeScript. It implements core and optional functionality as a set of TypeScript libraries that you import into your applications.

4.What is a Single Page Application (SPA)?

Single-page application(SPA) is a web application implementation.All the application’s function will be available in a single HTML document. It dynamically rewrites a current web page with new data.

5. What is the difference between AngularJS and Angular?

Angular JS, based on JavaScript, uses terms of scope and controllers while Angular uses a hierarchy of components. Angular is component-based while AngularJS uses directives.The TypeScript that Angular uses is a superset of ES6, which has backward compatibility with ES5.

6. What is MEAN stack development?

The MEAN stack is a software stack—that is, a set of the technology layers that make up a modern application—that’s built entirely in JavaScript. MEAN represents the arrival of JavaScript as a “full-stack development” language, running everything in an application from front end to back end.

7. What are annotations in Angular ?

An annotation is a comment added to provide explanation. It is normally added to articles or to literary works. Annotation is metadata added to the Angular code.

8. What are directives in Angular?

Directives are classes that add additional behavior to elements in the Angular applications. With Angular’s built-in directives, it is possible to manage forms, lists, styles, and what users see.

9. What is ng-content directive in Angular?

The ng-content tag is used for content projection. It is basically a placeholder to hold the dynamic content until it is parsed. Once the template is parsed, Angular replaces the tag with content.

10. What are components in Angular?

Components are the main building block for Angular applications.Component is a special kind of directive that uses a simpler configuration which is suitable for a component-based application structure. Angular components are a subset of directives, always associated with a template.

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11. What the different between a directive and component?

Directive is used to add behavior to an existing DOM element. Component is used to break up the application into smaller components. Directive is use to design re-usable components.

12. How to communicate between parent and child components?

The serves as the context for the . @Input() and @Output() give a child component a way to communicate with its parent component. @Input() allows a parent component to update data in the child component. Conversely, @Output() allows the child to send data to a parent component.

13. What is Subject in angular?

Subject is a special type of Observable in RxJs Library in which can send the data to other components or services. A Subject is like an Observable but can multicast to many observers which means subject is at the same time an Observable and an Observer.

14. Difference between Promises and observable

Promises deal with one asynchronous event at a time, while observables handle a sequence of asynchronous events over a period of time.Promises in AngularJS are provided by the built-in $q service.

They provide a way to execute asynchronous functions in series by registering them with a promise object.

15. What is Event emitter?

EventEmitter is an angular2 abstraction and its only purpose is to emit events in components. Quoting a comment from Rob Wormald. […] EventEmitter is really an Angular abstraction, and should be used pretty much only for emitting custom Events in components. Otherwise, just use Rx as if it was any other library.

16. What is Data binding in Angular?

Data-binding in AngularJS apps is the automatic synchronization of data between the model and view components. The way that AngularJS implements data-binding lets treat the model as the single-source-of-truth in the application.

17. What is Angular CLI?

The Angular CLI is a command-line interface tool that can be used to initialize, develop, scaffold, and maintain Angular applications directly from a command shell.The Angular CLI is used for much more than just creating an Angular project. It can be used to create components, services, pipes, directives and more. Also it helps in building, serving, testing etc.

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18. Sketch a pictorial diagram of Angular Architecture.

19. What is metadata in Angular?

Metadata is used to decorate a class so that it can configure the expected behavior of the class. The component decorator is used to declare the class in the app. component.

When we configure a component, we can are providing a metadata for that class that tells Angular that you have a component, and that component has a specific configuration.

20. What is compilation in Angular? What types of compilations are used in Angular

The Angular compilation process begins after your HTML page (static DOM) is fully loaded.There are two types of compilations in Angular: Just-in-time (JIT) compilation: This is a standard development approach which compiles our Typescript and html files in the browser at runtime, as the application loads.

21. What is the difference between Angular and React?

Angular is an open-source JavaScript framework that is written in TypeScript. React is an open-source JavaScript library that was developed by Facebook. It is based on JSX (an extension of PHP) and JavaScript.

The React Library divides the webpage into single components and simplifies the development of the interface.

22. What are pure Pipes?

Angular pipes are simple functions that transform the format of output data.Pure pipes are pipes that are executed when pure change is detected in the input value. It employs pure functions.

23. What is main differences between Angular expression and JavaScript expression?

Angular expressions are evaluated against a scopeobject. JavaScript expressions are evaluated against the global window. In Angular, expression evaluation is forgiving to undefined and null. JavaScript expression try to evaluate undefined properties generates ReferenceError or TypeError.

24. What is a service in Angular?

Angular services are singleton objects that get instantiated only once during the lifetime of an application. The main objective of a service is to organize and share business logic, models, or data and functions with different components of an Angular application.

25. Explain Es5 vs Es6 difference

ES6 class basically does the work of defining a new object and appending functions to its prototype. ES5 Function constructors work and look the same but the main difference is observed when the developer uses the Inheritance property. ES6 class allows the developers to instantiate objects using the new operator.

26. Explain the process how do we exchange the data from front end to server?

import { HttpModule } from ‘@angular/http’; @NgModule({ declarations: [], imports: [HttpModule] If you are using HttpClientModule make changes accordingly.

27. Difference between directive and pipe in Angular?

Pipes are for formatting data, and directives are to alter the behavior/appearance of an element. A pipe is to manipulate data, while a directive is more for DOM manipulation. A pipe gets data as an input, transforms it and outputs this data in another way.

28. What is SSE

Server-Sent Events (SSE) is a server push technology enabling a client to receive automatic updates from a server via HTTP connection. The Server-Sent Events EventSource API is standardized as part of HTML5 by the W3C.

29. What is ngContent?

The ng-content tag is used for content projection. It is basically a placeholder to hold the dynamic content until it is parsed. Once the template is parsed, Angular replaces the tag with content.

30. What is dependency injection (DI) in Angular?

Dependency injection, or DI, is a design pattern in which a class requests dependencies from external sources rather than creating them. Angular’s DI framework provides dependencies to a class upon instantiation

31. What is the use of ngFor directive in Angular?

The *ngFor directive is used to repeat a portion of HTML template once per each item from an iterable list (Collection). The ngFor is an Angular structural directive and is similar to ngRepeat in AngularJS.

32. What is the use of ngIf directive?

The NgIf directive is used when you want to display or remove an element based on a condition. If the condition is false the element the directive is attached to will be removed from the DOM.

33. What is interpolation in Angular?

Interpolation refers to embedding expressions into marked up text. By default, interpolation uses the double curly braces {{ and }} as delimiters. Angular replaces current Customer with the string value of the corresponding component property.

34. What are template expressions in Angular?

A template expression produces a value and appears within double curly braces, {{ }} . Angular resolves the expression and assigns it to a property of a binding target. The target could be an HTML element, a component, or a directive.

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Accenture Angular Interview Questions