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 is an AOT compilation in Angular?

The Angular ahead-of-time (AOT) compiler converts the Angular code into JavaScript code. The conversion happens before the browser downloads and runs the code. To achieve faster rendering in the browser, Compile your application during the build process.

2. What are modules in Angular?

A module is a mechanism or container to group the components, directives, pipes and services.It helps to encapsulate the code that deals with several aspects of an application. Developers can create modules using the NgModule decorator.

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 the Document Object Model?

The Document Object Model (DOM) is a programming API or object oriented representation for web documents. It represents the page and allows you to make changes. The DOM follows traditional object oriented design.

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 does Angular Material mean?

Angular Material is a User Interface component library. It is used to speed up the development of the user interfaces. Angular Material offers reusable and beautiful UI components. It allows to develop fully functional web pages, and applications.

13. What Are Differences Between Components And Directives?

Components have their own view (HTML and styles) and can 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 a template in Angular?

A template is a form of HTML which is a blueprint for UI. It contains attributes and elements. The template represents how to render the component. It provides a dynamic view to the end user. Also, it creates a complex view in an external HTML file.

15. What is an annotation in Angular?

Annotation is a block of text or metadata set in a class to represent an object with a string. It is used to detect errors by the compiler. Annotation can be edited at run time and displayed over a node.

16.What are Directives in Angular?

Directives are classes or extended custom HTML attributes to change the style or behavior to DOM elements. It can add additional behavior to elements. Angular’s built-in directives are used to manage forms, lists, styles.

17.What are Pipes in the Angular context?

Pipes are simple functions that can be applied directly in a template. It can be used throughout the angular application. Pipes accept input values and return the output as transformed value. Angular supports multiple inbuilt pipes that are customizable.

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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Amazon Angular Interview Questions