October 1, 2020

Top 10 AngularJs Interview Questions

If you are somebody who has just started learning about AngularJs or Angular, or somebody trying to crack interviews, or even someone
who is trying to get in depth of AngularJs, here are THE MOST ASKED 10 ANGULARJS QUESTIONS. After this, your understanding, skill and concepts
are going to be at another level. So enjoy!!

1. How AngularJs supports Single Page Application(SPA)?

Single page application (SPA) is a web application that fits on a single page. All your code (JS, HTML, CSS) is retrieved with a single page load. And navigation between pages performed without refreshing the whole page.Hence, first page load is slow but the site works even without net connection as pages are already cached.

2. What are directives in AngularJs?

Directives basically extend the HTML and add functionalities to DOM. ng-init, ng-app, ng-model,ng-reapeat are all directives in AngularJs.

3. What is digest cycle in AngularJs?

AngularJs best feature is that it picks up a change, as when applied and an internal cycle takes place updating the values and performing necessary operations. To explicitly use digest cycle $scope.$apply().

4.How two-way binding is implemented in AngularJs?

When the HTML template is rendered into a view  (surrounded by the double curly brackets) is replaced by the $scope property of the same name. This is the first half of the two-way binding. When the user types a new property into the text field a listener is fired and AngularJS instantly knows to update the $scope property  with whatever the user types. This is the second half of the two-way binding. Finally, thanks to the digest process, the bound view element is updated to reflect the new $scope property.

5.Difference between session storage vs local storage vs cookies

Local storage Stores data till  clearedby JavaScript, or clearing the Browser cache and can be read on the client site.The session Storage object stores data only till the browser (or tab) is closed. Cookies are primarily for server-side reading .

6.Difference between Factory And Services in AngularJs

Both factory and  services are used to communicate with servers using HTTP and also used to create reusable code for application, but the factories in angularjs will always return a new instance for each object which is not the case in AngularJs.

7. AngularJs vs AJAx

AJAX is an acronym that stands for Asynchronous JavaScript and XML.When using AJAX, there is no need to update the entire page every time, as only its specific part is updated. Hence, AngularJs basically uses the AJAX technology to build single-page applications but offers much more functionality.

8.What are providers in AngularJs

A provider is an object with a $get() method. The injector calls the $get method to create a new instance of a service. $provide have 6 methods to them, along with factory and service.

app.provider(‘ABC’, function () {
$get: function () {
return {
ans: ‘Return statement’

9. How Unit testing is implemented in AngularJs

AngularJS comes with dependency injection built-in, where you can isolate your code into units and test them accordingly. Karma and Jasmine are also two such tools for unit testing.

10.Difference between $scope and scope

$scope is a service that is injected in controller.  scope could be anything, it’s a function parameter name
function link( scope, element, attributes ) {
// Only scope

Hope, it would have brought lot more clarity from where you started. If you still have an any doubt, leave it in the comment section below. Our team would revert back within 24 hours.

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