Important Angular Questions

Angular important topics

1. What is Angular?

Answer:-

2. What is Angular CLI?

Answer:- The Angular CLI (Command Line Interface) is a powerful tool that streamlines the development workflow for creating, building, testing,  and maintaining Angular applications.

1. Purpose and Functionality:

   • The Angular CLI allows developers to interact with Angular projects directly from the command line.
   • It simplifies tasks such as project initialization, scaffolding, and building.
   • Developers can create new Angular projects, add components, services, and other features, and manage project configurations.

2. Installation:

   • To install the Angular CLI, use the following command with npm (Node Package Manager):

     npm install -g @angular/cli
     

   • The -g flag ensures that the CLI is installed globally on your system.

3. Basic Workflow:

   • Once installed, you can invoke the Angular CLI using the ng executable.
   • Here are some common commands:
     • To create a new Angular project:

       ng new my-first-project
       

     • To serve the project locally for development:

       cd my-first-project
       ng serve
       

     • The local development server automatically rebuilds the application and reloads the page when you change source files.

4. Workspace and Project Structure:

   • The Angular CLI creates an Angular workspace folder, which can contain multiple applications and libraries.
   • The initial application (created by ng new) resides at the top level of the workspace.
   • Additional applications or libraries are generated in the projects/ subfolder.
   • Each application has a src/ folder containing logic, data, and assets.
   • You can edit generated files directly or use CLI commands to add new components, services, and more.

5. Configuration:

• The main configuration file for the workspace is angular.json.
• It allows you to set defaults for CLI options and specify configurations for different build targets.

3. What are the advantages of Angular?

Answer:- There are the following advantages of Angular.

1. Developed and maintained by Google: Angular is backed by Google, which means it has a strong foundation and ongoing support.

2. Large community and ecosystem:

   Angular has a large and active community of developers, which makes it easier to find help, tutorials, and libraries.

3. Two-way data binding:

   Angular provides two-way data binding, allowing changes in the model to automatically update the view and vice versa.

4. Use of TypeScript:

   Angular is built with TypeScript, a statically typed superset of JavaScript. TypeScript adds features like static type checking, interfaces, and better tooling support.

5. Support for i18n (Internationalization):

   Angular has built-in support for internationalization, making it easier to create multilingual applications.

6. Support for lazy loading:

   Angular allows you to load modules lazily, improving performance by loading only the necessary parts of your application when needed.

7. Dependency injection:

   Angular’s dependency injection system simplifies managing dependencies and promotes modular code.

8. Powerful router:

   Angular’s router provides features like route guards, lazy loading, and nested routes, making it easy to create complex navigation structures.

4. Hooks in Angular?

Answer:- In Angular, "hooks" are often referred to as lifecycle hooks or lifecycle events. These hooks allow you to tap into various stages of a component or directive's lifecycle, enabling you to perform actions at specific points in time. Here are some common Angular lifecycle hooks:-

1. ngOnInit: This hook is called after Angular has initialized all data-bound properties of a directive or component.

2. ngOnChanges: This hook is called when any data-bound property of a directive or component changes.

3. ngDoCheck: This hook is called during every change detection cycle, allowing you to implement your own custom change detection logic.

4. ngAfterContentInit: This hook is called after Angular projects external content into the component's view.

5. ngAfterContentChecked: This hook is called after Angular checks the content projected into the component's view.

6. ngAfterViewInit: This hook is called after Angular initializes the component's views and child views.

7. ngAfterViewChecked: This hook is called after Angular checks the component's views and child views.

8. ngOnDestroy: This hook is called just before Angular destroys the directive or component.