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Top 20 Angular JS Training(MEAN STACK) Interview Questions and Answers

The AngularJS Training (MEAN Stack) is designed to provide an in-depth understanding of front-end development using AngularJS as part of the MEAN (MongoDB, Express.js, AngularJS, Node.js) stack. This course is perfect for developers looking to build dynamic, single-page web applications that are scalable and fast. By the end of the training, participants will be proficient in integrating AngularJS with MongoDB, Express.js, and Node.js to create full-stack applications.

1. What is AngularJS?

AngularJS is a JavaScript-based framework for building dynamic single-page web applications. It extends HTML capabilities through directives and binds data to HTML using expressions.

2. Explain the MVC architecture in AngularJS.

MVC stands for Model-View-Controller. AngularJS separates the application into these components: the Model (data), the View (UI), and the Controller (logic). This helps in organizing code efficiently.

3. What are directives in AngularJS?

Directives are markers on a DOM element (such as attributes, elements, or comments) that tell AngularJS to attach specific behaviors or manipulate the DOM.

4. How does data binding work in AngularJS?

AngularJS uses two-way data binding, where any changes in the UI reflect in the model and vice versa.

5. What are services in AngularJS?

Services in AngularJS are singleton objects used to organize and share code across the application, often used for handling data fetching, logging, and other functions.

6. What is dependency injection in AngularJS?

Dependency Injection is a design pattern used in AngularJS to inject dependencies (like services, factories, or values) into components (like controllers or directives) instead of hard-coding them.

7. What is a $scope in AngularJS?

$scope is an object that represents the application model. It acts as a bridge between the controller and the view.

8. Explain the difference between ng-if and ng-show/ng-hide.

ng-if removes the element from the DOM if the condition is false, while ng-show/ng-hide simply hides the element but keeps it in the DOM.

9. What is routing in AngularJS?

Routing allows for navigation between different views or pages in a single-page application. It is implemented using the ngRoute module.

10. What is a promise in AngularJS?

A promise represents a future value or error. It’s used to handle asynchronous operations like API calls in AngularJS.

11. What are filters in AngularJS?

Filters are used to format the value of expressions for display to the user. Examples include currency, date, limitTo, etc.

12. What is $http service in AngularJS?

$http is an AngularJS service used to make HTTP requests (like GET, POST) to communicate with backend servers.

13. Explain ng-repeat directive in AngularJS.

ng-repeat is used to iterate over a collection (array or object) and generate a list of elements in the DOM.

14. What is $digest cycle in AngularJS?

The $digest cycle is a process where AngularJS checks for changes in the scope model and updates the DOM accordingly.

15. How does AngularJS handle form validation?

AngularJS provides built-in validators like required, minlength, and custom validators to handle form validation.

16. What is $watch in AngularJS?

$watch is a function in AngularJS that watches for changes in scope properties and executes a callback function when a change is detected.

17. What is $apply in AngularJS?

$apply is used to execute an expression and trigger the $digest cycle manually, ensuring that the view is updated.

18. What are modules in AngularJS?

Modules in AngularJS are containers for the different parts of an application, such as controllers, services, directives, etc.

19. What is the role of $routeProvider in AngularJS?

$routeProvider configures the routes (or views) in AngularJS applications.

20. xplain ng-model directive in AngularJS.

ng-model binds the value of HTML elements (like inputs, textareas) to application data and ensures two-way data binding.

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