FIS – Angular Interview Questions

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

1. Differentiate between Angular and AngularJS.

AngularJS refers to the 1. X versions and "Angular" without the "JS" referring to versions 2 and up. The TypeScript that Angular uses is a superset of ES6, which has backward compatibility with ES5.

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

2. What is Angular?

Angular is a structural framework for dynamic web apps and building single-page client applications using HTML and TypeScript. It implements core and optional functionality as a set of TypeScript libraries that can be imported into the applications.

It allows to use HTML as the template language and to extend HTML's syntax to express the application's components clearly and succinctly

3. What are the advantages of using Angular?

Effective Cross-Platform Development.
High quality, faster development process of the Application.
Improved speed and performance with readable and testable Code.
More Lightweight Web Applications and Problem-Solving Patterns.
Excellent Material Design Library.

4. What is Angular mainly used for?

Angular is used for the development of SPA which stands for Single Page Applications. Angular provides a set of ready-to-use modules that simplify the development of single page applications.

5. What Is Ecmascript ?

JavaScript is formally known as ECMAScript also known as "ES6" which is the new version of JavaScript offers a number of new features that extend the power of the language. Angular makes use of a number of features of ES6 and TypeScript.

6. What Are Differences Between Components And Directives?

Component is a directive which use shadow DOM to create encapsulates visual behavior called components. A directive is used to add behavior to an existing DOM element to design re-usable components.

Component is used to break up the application into smaller components.

7. What Is An Angular 2 Component?

Components are the most basic UI building block of an Angular app. An Angular app contains a tree of Angular components that are a subset of directives, always associated with a template. Unlike other directives, only one component can be instantiated for a given element in a template.

8. In Angular what is string interpolation?

String Interpolation is a one-way data-binding technique that is used to transfer the data from a TypeScript code to an HTML template (view). It uses the template expression in double curly braces to display the data from the component to the view.

9. Write a syntax for ngFor with example

The syntax for ngFor is *ngFor="let of " . is a variable name of your choosing, is a property on your component which holds a collection, usually an array but anything that can be iterated over in a for-of loop.

10. Reversing a number in an array – program


	// Driver code
vararr = [ 11, 89, 23, 7, 98 ]; 
 
// use of reverse() method 
varval = arr.reverse();
   
// printing
console.log(val );

11. How to find missing number in array - program.


	var a = [5],
count = 5;
var missing = new Array();

for (vari = 1; i<= count; i++) {
if (a.indexOf(i) == -1) {
missing.push(i);
  }
}
console.log(missing); // to check the result.

12. How did you get the value from input box using JQuery?


$(document).ready(function() {
  $("#txt_name").keyup(function() {
alert($(this).val());
  });
})  <input type="text" id="txt_name" />

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13. What do you understand by controllers in Angular?

Controller in AngularJS is nothing but JavaScript constructor function that uses the Angular scope. It also controls the data of the application. Controller function is attached with DOM object. The ng-controller directive helps to define controller.

14. What is scope in Angular?

A controller (constructor) function is responsible for setting model properties and functions which has an associated $scope object. This can be done only through $scope. Whatever function or model you apply in View (html file), that is accessed in controller using scope.

15. What are directives in Angular?

Directives in Angular are Typescript class which is declared with decorator @Directive. These are the Document Object Model (DOM) instruction sets, which decide how logic implementation can be done.

16. What is data binding?

Data-binding keeps the View and Model in sync at all the time which is the automatic synchronization of data between the Model and View components in AngularJS. When a view is bound with expression directive, the system binds data in only one direction.

17. What is the purpose of a filter in Angular?

Filter is an important part basically used to filter an item from a group of items, which is in an array or an object array. It selects a subset of the items from an array and returns it as a new array and this item is displayed on UI.

18. What is a provider in Angular?

Providers are classes that create and manage service objects the first time that Angular needs to resolve a dependency used to register the classes to an angular module as a service. And then, this service classes can be used by other components during the creation phase in the module.

19. How can you differentiate between Angular expressions and JavaScript expressions?

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

20. What is the difference between $scope and scope in Angular?

In Angular js $scope is used whenever we have to use dependency injection (D.I) whereas as the scope is used for directive linking.

21. Import ________ module to use reactive form.

Before using reactive forms in Angular 9, import FormsModule and ReactiveFormsModule in the application module. Use reactive forms in our application! Open the src/app/login. Component.

22. What is Buffer (window storage)?

Angular window storage offers an easy interface for usage of the web storage and cookies which works as a store manager and in control too.

What angular window storage offers that is a distinction from others libraries is the possibility to default to cookies if web storage is not available in the browser, cookie chunking and custom encoders and decoders great for things like compression.

23. How did you get the value from input box using JQuery?

To get the textbox value, use the jQuery val() function. For example, $('input:textbox'). val() – Get textbox value

24. Whenever invoke ngOnDestroy. ngDoCheck ligOn.Init?

OnDestroy 's primary purposeis to perform “Cleanup just before Angular destroys the directive/component. Unsubscribe Observables and detach event handlers to avoid memory leaks.

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

Making use of value of property
Explicit call to the property
Explicit call to function with no arguments for final result.

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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 .

FIS Angular Interview Questions