Angular JS
Interview Questions

Two-way data binding in AngularJS allows automatic synchronization of data between the model (JavaScript variables) and the view (HTML elements). Changes in the model update the view, and changes in the view update the model, reducing the need for manual DOM manipulation.

The digest cycle in AngularJS is a mechanism that checks and updates all data bindings in the application. It iterates through the watchers to identify changes in the model and update the view. This cycle ensures that the model and view are in sync

Directives are markers on a DOM element that tell AngularJS to attach a specified behavior to that DOM element or even transform it. They extend HTML with new attributes and tags and are a way to create reusable components and enhance the functionality of HTML elements.

An AngularJS module is a container for different parts of an application, including controllers, services, filters, and directives. It helps in organizing and structuring the application. Modules can depend on other modules, enabling modular development and code reuse.

A controller in AngularJS is a JavaScript constructor function that is used to augment the AngularJS scope. It provides the business logic for the view. In contrast, a directive is used to extend the functionality of HTML elements, often associated with DOM manipulation.

Scope in AngularJS is an object that refers to the application model. It serves as a bridge between the controller and the view, allowing them to communicate. Changes made to the model inside the controller are reflected in the view through the scope.

AngularJS services are reusable, singleton objects that perform specific tasks and provide functionality across different parts of an application. They promote code modularity and encapsulation and are often used for tasks such as data retrieval, logging, and communication between components.

Dependency Injection in AngularJS is a design pattern where the components of a system are given their dependencies rather than creating or finding them. AngularJS has a built-in dependency injection system that simplifies the management of dependencies in controllers, services, and other components.

Routing in AngularJS allows the creation of single-page applications with multiple views. It is achieved using the ngRoute module or the more recent ui-router library. Routes are defined, and when the URL changes, AngularJS loads the associated view and updates the content dynamically.

Nested views in AngularJS can be implemented using the ui-router library. It allows the definition of states and nested states, providing a hierarchical structure to the application. Each state corresponds to a view and associated controller.

Jasmine is a behavior-driven development (BDD) framework for testing JavaScript code. It is often used with Karma, a test runner, to test AngularJS applications. Jasmine provides a syntax for writing tests and assertions and supports features like spies for mocking.

End-to-end testing in AngularJS involves testing the application's workflow from start to finish. It simulates real user interactions and validates that the application behaves correctly. Tools like Protractor are commonly used for E2E testing in AngularJS.

Two-way data binding is a feature of AngularJS that automatically synchronizes the data between the model and the view. Any changes to the model are reflected in the view, and vice versa, without the need for manual intervention.

Directives are markers on a DOM element that tell AngularJS to attach a specific behavior to that element or transform the DOM structure. They extend HTML with new attributes and elements, and AngularJS comes with a set of built-in directives like ng-model, ng-bind, ng-if, etc. Developers can also create custom directives for specific functionalities.