1. What is Angular?

Angular is a popular open-source framework for building web applications. It is developed and maintained by Google. Angular is written in TypeScript, a superset of JavaScript, which adds type safety and other features to JavaScript.

2. What are the main features of Angular?

Angular is a powerful framework for building web applications. Its main features include:

Component-based architecture for modular, reusable code.

Two-way data binding to synchronize model and view.

Dependency Injection for better service management.

Directives to extend HTML functionality.

Routing for navigation and lazy loading in SPAs.

RxJS for handling asynchronous tasks.

Forms Template-driven and reactive forms for better user input handling.

Modules to organize and manage code.

AOT Compilation for faster performance.

Testing support with Jasmine and Karma.

Internationalization (i18n) for multi-language apps.

CLI to streamline development tasks.

Performance optimizations like lazy loading and tree-shaking.

PWA support for offline functionality.

Animation support to enhance UI interactions.

3: What is Angular CLI?

Angular CLI (Command Line Interface) is a powerful tool used for automating and streamlining various tasks involved in Angular development. It helps developers by providing a set of commands for generating components, services, and other elements of an Angular application, as well as for building, testing, and deploying the app.

4: What is a directive in Angular?

In Angular, a directive is a special kind of class that allows you to extend HTML functionality by attaching behavior to elements in the DOM (Document Object Model). Directives are used to manipulate the structure or appearance of the DOM or to add custom behavior to elements, such as creating dynamic templates or modifying the layout.

5: Explain two-way data binding in Angular.

In Angular, two-way data binding is a mechanism that allows for the synchronization of data between the component class and the view (template). This means that any change in the model (component class) is reflected in the view (template), and any change in the view (user interaction) is immediately reflected in the model.

6: What is the difference between Angular and AngularJS?

The main difference between Angular and AngularJS (the original version, Angular 1.x) lies in the framework's architecture, design principles, and functionality. Angular is a complete rewrite of AngularJS, and while both frameworks serve the same purpose of building dynamic web applications, they have significant differences in terms of performance, architecture, and features.

7: Differences between one-way binding and two-way binding

One-Way Data Binding:

One-way data binding refers to the flow of data in a single direction: from the component (model) to the view or from the view to the component, but not both.

Two-Way Data Binding:

Two-way data binding allows the data to flow in both directions: from the component to the view and from the view to the component. Any changes made in the view (such as user input) will automatically update the component, and any changes in the component will immediately reflect in the view.

8: What is a module in Angular:

In Angular, a module is a mechanism that helps organize and structure an Angular application. It is a container that holds different parts of an application, such as components, directives, services, pipes, and other modules. A module enables the grouping of related code into cohesive blocks of functionality.

9: What is a service in Angular:

In Angular, creating a service is a straightforward process. Services are used to handle business logic, data management, and communication with external resources like APIs. Angular services are typically implemented as classes with methods that can be injected into components, directives, or other services via dependency injection.

10: What is string interpolation in AngularJS

In AngularJS (the first version of Angular), string interpolation is a feature that allows you to embed expressions inside HTML templates, dynamically updating the content of HTML elements based on the model data.

11: What is the digest cycle in AngularJS

In AngularJS, the digest cycle is the process by which the framework checks for changes in the model (data) and updates the view accordingly. It is a core mechanism that enables two-way data binding in AngularJS, allowing the view to reflect changes in the model and vice versa

12: Explain lazy loading in Angular.

Lazy loading in Angular is a design pattern used to load modules on demand rather than loading all the modules of an application at once. This improves the initial load time of the application by splitting it into smaller, more manageable bundles. Only the required modules are loaded when the user navigates to a specific route or page, reducing the size of the initial JavaScript bundle.