Amazon – Angular Interview Questions

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

1.What Are The New Features Of Angular2?

The new features of Angular 2:

Improved Dependency Injection (DI)
Annotation, Templating
Child Injectors, Child Router
Instance Scope
Dynamic Loading

2. What Is The Need Of Angular2?

Angular 2+ is written in TypeScript which is a superset of JavaScript that implements many new ES2016+ features, and was since its inception. By focusing on making the framework easier for computers to process, Angular allows for a much richer development ecosystem.

3. What Is Typescript ?

TypeScript is a free, open source programming language developed and maintained by Microsoft. It is a strict superset of JavaScript, adds optional static typing and class-based object-oriented programming to the language.

4. What Is Traceur Compiler ?

Traceur compiler takes classes, generators, and other features from ECMAScript edition 6 (ES6) and compiles it into JavaScript ES5 that runs on the browser. Developers can use the code from a future version that has more features and encourages design patterns.

5. What Is Component In Angularjs 2

In AngularJS, a Component is a special kind of directive that uses a simpler configuration which is suitable for a component-based application structure. It is easier to write an app in a way that's similar to using Web Components or using the new Angular's style of application architecture.

6. What Is @outputs In Angular?

@Output is a decorator to mark an output property which is used to define output property to achieve custom event binding.

7. How did you hidden (not hide) the element in JQuery?

Elements that are not in a document are not considered to be visible; jQuery does not have a way to know if they will be visible when appended to a document. To set visibility jQuery.fn.visible = function() { return this.css('visibility', 'visible'); };.

8. What are the basic rules of Decorators?

A Class Decorator is declared before a class declaration and applied to the constructor of the class and can be used to observe, modify, or replace a class definition.

9. doAdd(1,2) doAdd( 1.2,3,4) use the above arguments to sum the values. using without any parameter receive through the function

Currying is a technique of evaluating a function with multiple arguments, into sequence of function with single/multiple argument. In above problem, we simply turn up add(2,3) into add(2)(3).

10. What is Share Module?

Shared modules allow organizing and streamlining the code. You can put commonly used directives, pipes, and components into one module and then import just that module wherever needs it in other parts of your application.

11. Explain JQuery selector?

JQuery selectors are used to "find" (or select) HTML elements based on their name, id, classes, types, attributes, values of attributes and much more.

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12. What Is Primeng? How Can It Be Used With Angular2?

PrimeNG is a rich UI component collection dedicated to Angular. Widgets present here are completely open-source and free to use. It's simple, lightweight yet powerful and optimized for responsive cross-browser touch.

13. What Are Differences Between Components And Directives?

Components have their own view (HTML and styles) andcan extend directives. Directives are just "behavior" added to existing elements and components.Because of that there can only be one component on a host element, but multiple directives.

14. What Is An Angular 2 Component?

In angular 2, component is a main building block of an angular 2 application which perform all the tasks that were performed by controllers, scopes and directives. In an application, we can have any number of components which is a particular view of the application with its own logic and data.

15. How Can We Setting Up Angular 2 Application?

Go to the “get started with npm” section in the site.
In the next screen, choose the installer to download, depending on the operating system. Launch the installer.
In the next screen, Accept the license agreement and click the next button.
In the next screen, choose the destination folder for the installation and click the Next button.
Choose the components in the next screen and click the Next button. You can accept all the components for the default installation.
In the next screen, click the Install button.
Once the installation is complete, click the Finish button
To confirm the installation, in the command prompt you can issue the command npm version. You will get the version number of npm as shown in the following screenshot.

16. What Are The Advantages Of Using Angular 2 Over Angular 1?

Angular 2 implements unidirectional-tree based change detection which, again, increases the performance. If you compare the file size, Angular 2 is 20 kb less than Angular 1 which helps in decreasing the load time for apps. Angular 2 provides more choice for languages.

17. How Routing Works In Angular 2

How Angular Router Works

Reads the browser URL the user wants to navigate to and applies a URL redirect (if one is defined)
It figures out which router state corresponds to the URL and runs the guards that are defined in the router state.
It resolves the required data for the router state.

18. What is display:block and display:none?

display: none means that the element is not displayed at all (so you won't see it in the example either). display: block means that the element is displayed as a block, as paragraphs and headers have always been.

19. Which version you are using JS?

To find the version, visit the System information tool to see what version of JavaScript is detected. JavaScript is browser dependent, which means the version of JavaScript detected may be different in Firefox than the version detected by Internet Explorer.

20. How do you interact between two components?

The ways to communicate data between Angular components are,

Parent to Child: Sharing Data via Input.
Child to Parent: Sharing Data via ViewChild with AfterViewInit.
Child to Parent: Sharing Data via Output() and EventEmitter.

21. In JSON have one array then how to assign this array to an variable.

To create array element first and then had to push the element.


elementToPush = [1, 2, 3]
if (!obj.arr) this.$set(obj, "arr", [])
obj.arr.push(elementToPush)

22. Explain JQuery selector?

JQuery selectors are used to "find" (or select) HTML elements based on their name, id, classes, types, attributes, values of attributes and much more.

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TOP MNC's ANGULAR INTERVIEW QUESTIONS & ANSWERS

Here we listed all Angular Interview Questions and Answers which are asked in Top MNCs. Periodically we update this page with recently asked Questions, please do visit our page often and be updated in Angular .

Amazon Angular Interview Questions