Interview Questions And Answer


1. What is Angular.js?

Answer:

Angular.js is a popular JavaScript framework developed and maintained by Google. It is used to build dynamic, single-page web applications (SPAs).

2. Explain the key features of Angular.js.

Answer:

Key features of Angular.js include two-way data binding, dependency injection, templating, routing, and a modular structure.

3. What is the purpose of Angular.js modules?

Answer:

Modules in Angular.js organize the different parts of an application, such as services, controllers, and directives, into reusable and testable components.

4. Explain the concept of dependency injection in Angular.js ?

Answer:

Dependency injection is a software design pattern that Angular.js uses to manage the dependencies between different components of an application.

5. What are Angular.js directives and how do they work?

Answer:

Directives are custom HTML tags, attributes, classes, or comments that extend the functionality of the DOM. They allow developers to create reusable components.

6. Explain the difference between ng-app, ng-controller, and ng-model ?

Answer:

ng-app defines the root element of an Angular.js application, ng-controller associates a controller with the view, and ng-model binds an input element to a model in the scope.

7. What is the purpose of the $scope object in Angular.js?

Answer:

The $scope object is a JavaScript object that acts as the glue between the controller and the view. It is used to share data and methods between them.

8. Explain the concept of Angular.js services ?

Answer:

Services in Angular.js are reusable pieces of code that can be injected into controllers, directives, and other services. They promote code reuse and testability.

9. What is the difference between an Angular.js factory and an Angular.js service?

Answer:

The main difference is that a factory is a function that returns an object, while a service is a constructor function that is instantiated with the new keyword.

10. How do you test Angular.js applications?

Answer:

Angular.js applications can be tested using unit tests with tools like Jasmine and Karma, and end-to-end tests with tools like Protractor.

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