Important Angular Questions

Angular important topics

1. What is Angular?

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 initializationscaffolding, 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.

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