1. What is Angular?
Angular is a popular open-source JavaScript framework developed by Google for building dynamic web applications. It follows the Model-View-Controller (MVC) architectural pattern and provides a comprehensive set of features for creating single-page applications.
2. What are the key features of Angular?
Some key features of Angular include:
- Dependency injection
- Component-based architecture
- Templates and directives
- Routing
- Forms handling
- Testing support
- Mobile development capabilities
- Two-way data binding
3. What is the difference between AngularJS and Angular?
AngularJS, also known as Angular 1.x, and Angular (Angular 2+ versions) are two different frameworks. AngularJS uses a different architecture based on scopes and controllers, while Angular uses a component-based architecture. Angular provides improved performance, better modularity, and enhanced tooling compared to AngularJS.
4. Explain the Angular component lifecycle hooks.
Angular component lifecycle hooks are methods that allow you to tap into specific moments in the lifecycle of a component. Some commonly used hooks are:
- ngOnInit: Called after the component is initialized.
- ngOnChanges: Called when the input properties of a component change.
- ngOnDestroy: Called before the component is destroyed.
- ngAfterViewInit: Called after the component's view has been initialized.
5. What is data binding in Angular?
Data binding in Angular is a mechanism that connects the data model with the view. It allows you to automatically synchronize data between the component and the template, providing a seamless and efficient way to update and display data.
6. What is Angular CLI, and why is it useful?
Angular CLI (Command Line Interface) is a powerful tool that provides a command-line interface for creating, managing, and deploying Angular applications. It helps with project scaffolding, generating components, services, and modules, running tests, and optimizing the application for production.
7. What is Angular routing, and how does it work?
Angular routing allows you to navigate between different components and views within a single-page application. It uses a router module to define routes and their associated components. When a user navigates to a specific route, Angular dynamically loads the associated component and updates the view accordingly.
8. What are directives in Angular?
Directives in Angular are instructions that allow you to extend the functionality of HTML elements. There are three types of directives: component directives, attribute directives, and structural directives. Component directives define reusable UI components, attribute directives change the behavior or appearance of an element, and structural directives manipulate the DOM structure.
9. How does dependency injection work in Angular?
Dependency injection (DI) is a core feature of Angular that allows you to efficiently manage the dependencies of your components. Instead of creating dependencies within the component, Angular's DI system injects them from external sources. This promotes modular and testable code and improves code reusability.
10. What is Angular template-driven forms and reactive forms?
Angular provides two approaches for handling forms: template-driven forms and reactive forms. Template-driven forms rely on directives within the HTML template, and the form's behavior is determined by the template itself. Reactive forms, on the other hand, are model-driven and use reactive programming principles. They define the form structure and behavior programmatically using TypeScript.
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