Explore AngularJS Interview Questions And Answers For Beginners

Much like most other frameworks, the beauty of AngularJS lies in its nuances; in its thoughtfully developed features and functionalities. To leverage the framework, it is important to first equip yourself with an in-depth knowledge of AngularJS.

Today, AngularJS is one of the preferred frameworks among developers. One of the prime reasons why it is popular is because of its modularity trait. It allows and enables web developers to create multiple modules easily for a single website application. It also recognizes the need to create an additional module so that it can be combined with other developed application modules.

Being one of the most popular frameworks, mastering AngularJS becomes important if you want to excel in the software industry. Companies today are looking for expertise that extends beyond just the basics; which is why when it comes to AngularJS interview questions and answers for freshers, they do not hold back on testing your skills.

As an aspiring professional, and as a consequence of high competition, you need to be best prepared to outshine the rest in the race. To help you with the same, here is a curated list of the most asked AngularJS interview questions in 2021-

Top 30 AngularJS Interview Questions And Answers For Beginners1. Define AngularJS?

Created in 2009 by two developers, Misko Hevery and Adam Abrons, AngularJS is a JavaScript-based, front-end web framework maintained by Google to resolve the complexities of developing single-page applications featuring a smoother user interface. This structural framework uses HTML as a template language. It also lets you extend HTML syntax to define an application’s components clearly. Its data binding and dependency injection help eliminate a good amount of the code that one would otherwise have to write.

2. What are the key features of AngularJS?

• Data-binding
• Controller
• Services
• Scope
• Filters
• Directives
• Routing
• MVC pattern
• Dependency Injection

We have an in-depth analysis of Angular Features.

3. What is Scope in AngularJS?

Scopes are special objects in AngularJS that act as a glue between the view and the controller. They refer to the model component of the MVC architecture. They are arranged in a hierarchical way to mimic the DOM structure hierarchy. AngularJS has an in-built $scope object that has all the application data and the corresponding methods bound to that scope.

4. What do the services represent in AngularJS?

Services are single objects which carry out tasks they are created for. They interact with each other and are wired by using the concept of Dependency Injection that helps the framework in organizing and sharing the code across the application. There are various in-built services provided by AngularJS. AngularJS also supports the creation of custom services that are more commonly used by developers.

5. What are directives?

Directives are the most important components of AngularJS elements that represent the DOM element markers providing new behavior to the DOM elements like elements name, attributes, CSS classes, or comments. They are used for creating custom HTML tags that operate similarly to custom widgets.

6. Explain MVC in reference to Angular.

AngularJS is an MVC-based framework, where the Model for a controller contains data, the controller for a view contains the logic to manipulate that data, and the view is the HTML that displays the data.

7. What is one-way binding?

Here, the changes in the model are reflected on the view but changes in the view to that data are not reflected on the model. The binding is one way from the model to view. This is achieved by making use of the ng-bind directive.

8. What is two-way binding?

Two-way binding means that when data in the view is changed the underlying model gets updated automatically and when a model from the controller is changed the view gets updated.

9. Explain the purpose of interpolation in AngularJS?

Interpolation refers to the phenomenon of binding data by embedding expressions to the attribute and text nodes. The compiler does the task of matching the text and the attributes during the compilation.

10. How can you integrate AngularJS with HTML?

We can integrate AngularJS in the HTML page by first binding the AngularJS library to the HTML page using the

11. Define $rootScope in AngularJS application.

$rootScope refers to the scope object created on the DOM element containing the ng-app directive meant for bootstrapping the AngularJS application. There can be only one $rootScope object in the entire application.

12. What is the difference between ng-if and ng-show?

Ng-if doesn’t render the portion of DOM element on which it is associated if the specified condition is not met whereas ng-show renders the DOM element but set its CSS property of display to none if the specified condition is not met

13. Why is $watch used?

$watch is used for keeping track of the old and new values of the expression or the model variable that is being watched.

14. What is scope hierarchy?

Every application developed in AngularJS has one $rootScope object and many child $scope objects. Whenever a new scope is created, that is added to the parent scope. This results in the creation of a hierarchical structure like the DOM structure.

15. What are custom filters?

With AngularJS we can create our own filters. This can be done by associating the filter to our module. These types of filters are called custom filters.

16. How is the mouse double click event accomplished?

To specify any custom behavior upon double click event on any HTML element, AngularJS makes use of the ng-dblclick directive. It is to be noted that the ng-dblclick does not override the JavaScript’s ondblclick event.

17. Why is the findIndex() method used? What does it return in case the value is not found?

findIndex() method returns the position of the element in any object. In case the element is not found then the method returns -1.

18. Is it possible for a parent controller to access the methods and properties of the child controller?

No, the parent controller can’t access the properties and the methods of the child controller. But the child controller can access the parent’s methods.

19. What is the importance of track in the ng-repeat directive?

ng-repeat directive helps to keep track of all DOM elements dynamically to minimize DOM creation and rendering. It is achieved by storing the instances of the object whenever a new element gets added to the list or collection. AngularJS just renders the newly added element instead of re-rendering the overall collection. This helps in rendering the elements faster.

20. Differentiate between compile and link in AngularJS?

Compile is like a service used for traversing the HTML to find all the directives and return link functions. The link does the task of combining the model with a view where any changes made to the model are reflected in the view and vice versa.

21. How does routing work in AngularJS?

Routing enables developers to create different URLs according to different contents in our app which in turn enables the users of the application to bookmark the contents as per their requirements.

22. What are some examples of inbuilt angular filters?

Currency, lowercase, uppercase, number, date are few inbuilt angular filters.

23. What is the importance of orderBy?

orderBy is a built-in filter in AngularJS that helps to reorder the array items based on defined criteria.

24. Is it possible to create nested controllers?

Yes, it is possible to create nested controllers in AngularJS.

25. Can there be two ng-apps for a single angular application?

No, there can’t be more than one ng-apps for a single AngularJS application.

26. What are the different phases of the life cycle of AngularJS Scope?

• Creation
• Model mutation
• Mutation observation
• Scope destruction

27. How can you maintain logs in AngularJS?

Logs in AngularJS can be maintained by using the $log built-in service. They are done by mainly using the below methods:

log() | info() | warn() | error() | debug()

28. What is the auto bootstrap process?

Auto Bootstrapping is the process of automatically initiating the DOMContentLoaded event in the browser.

29. What are the lifecycle hooks available?

There are many lifecycle hooks available in AngularJS and they are:

• ngOnInit()
• ngOnChanges()
• ngDoCheck()
• ngAfterContentInit()
• ngAfterContentChecked()
• ngOnDestroy()
• ngAfterViewChecked()

30. What is the difference between the $ and the $$ prefixes?

The $$ prefix is used to define a private variable in AngularJS. The $ prefix is used for defining built-in core AngularJS functionalities like variable, parameter, method, or any properties.

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