A software design pattern called CQRS (Command Query Responsibility Segregation) divides up who is responsible for accessing and writing data in a system. The same set of components are frequently used in traditional design patterns for both reading and writing data. CQRS introduces two distinct models to suggest the division of these duties.

• Command Model: The command model handles event triggering, data store updating, and command processing and validation.
• Query Model: This model manages the processes involved in getting data out of the system.

The four major concepts of CQRS are listed below:

• Command: Action or request to modify the system's status
• Query: An occurrence or a request to obtain data from the system
• Command Handler: An element in charge of processing commands and adjusting the system's state.
• Query Handler: An element in charge of managing queries and getting information out of the system.

CQRS Offers Advantages like:

• Scalability: Because the application supports several read and write data models, it can be scaled.
• Flexibility: It permits the use of distinct data stores that are best suited for writing and reading processes.
• Performance: There is room for improvement with this application.

This CQRS Model may be used with Nest JS; in this tutorial, we'll discover how to do it.

We'll use the creation and retrieval of a TODO application as an example using the CQRS paradigm.

Application for TODOs using CQRS pattern
You must use the command line to install nest cli if it is not already installed globally on your computer.
npm i -g @nestjs/cli

Create new Nest Js project if not created already using below command
nest new todo-application

Dependency Installation
Nest JS provides a package to implement CQRS, we need to install the package first using below command
npm install --save @nestjs/cqrs

Module Creation
Create new Module for our TODO application using command
nest generate module todo

Commands
Commands are used to change the application state, when a command is triggered, it is handled by corresponding command handler. Then handler will be responsible to process the operation. Every command will have command handler in order to process the command

Create new file inside todo module with name create-todo-command.ts and implement the below code
import { ICommand } from '@nestjs/cqrs';

export class CreateToDoCommand implements ICommand {
    constructor(
      public readonly title: string,
      public readonly description: string,
    ) {}
}

Command Handler
Create new file inside todo module with name create-todo-command-handler.ts  and implement the below code

import { CommandHandler, ICommandHandler } from '@nestjs/cqrs';
import { CreateToDoCommand } from './create-todo-command';

@CommandHandler(CreateToDoCommand)
export class CreateToDoHandler implements ICommandHandler<CreateToDoCommand> {
  async execute(command: CreateToDoCommand): Promise<void> {
    // Add Logic to do validation and business rule
    const { title, description } = command;

    // Use Repository to save directly or Create Factory to add business logic and save
  }
}

Query
Queries are used to retrieve the data from the application, when a query is requested, Query handler handles the requests and retrieves the data. Every query will have query handler

Create new file inside todo module with name get-todo-query.ts  and implement the below code
import {  IQuery } from '@nestjs/cqrs';

export class GetToDoQuery implements IQuery {
    constructor() {}
}

Query Handler
Create new file inside todo module with name get-todo-query-handler.ts  and implement the below code
import { IQueryHandler, QueryHandler } from '@nestjs/cqrs';
import { GetToDoQuery } from './get-todo-query';

@QueryHandler(GetToDoQuery)
export class GetToDoQueryHandler implements IQueryHandler<GetToDoQuery> {
  async execute(query: GetToDoQuery): Promise<any> {
    // Fetch data using repository or factory and return it
    // Sample Response
    return [
      { id: 1, title: 'Test', description: 'Reminder to complete daily activity' },
      { id: 2, title: 'Test 2', description: 'Reminder to complete daily activity2' },
    ];
  }
}

Module
In the todo.module.ts  file, import the CQRS module to use the command handlers and query handlers
import { Module } from '@nestjs/common';
import { CqrsModule } from '@nestjs/cqrs';
import { ToDoController } from './todo.controller';
import { CreateToDoHandler } from './create-todo-command-handler';
import { GetToDoQueryHandler } from './get-todo-query-handler';

@Module({
  imports: [CqrsModule],
  controllers: [ToDoController],
  providers: [CreateToDoHandler, GetToDoQueryHandler],
})
export class ToDoModule {}

Controller
Create todo.controller.ts  file to handle the API request and use command and query bus
import { Controller, Get, Post, Body } from '@nestjs/common';
import { CommandBus, QueryBus } from '@nestjs/cqrs';
import { CreateToDoCommand } from './create-todo-command';
import { GetToDoQuery } from './get-todo-query';

@Controller('ToDo')
export class ToDoController {
  constructor(
    private readonly commandBus: CommandBus,
    private readonly queryBus: QueryBus,
  ) {}

  @Post()
  async createToDo(@Body() body: { title: string, description: string }): Promise<void> {
    const { title, description } = body;
    await this.commandBus.execute(new CreateToDoCommand(title, description));
  }

  @Get()
  async getToDo(): Promise<any[]> {
    return this.queryBus.execute(new GetToDoQuery());
  }
}

Pro Tips
You can create a separate folder for command and query to segregate the code and make it more readable. Also, here I just gave the basic high level demo, but in your application, you can create dto for command and query, and you can directly use that dto
Conclusion

In conclusion, while CQRS can provide advantages in terms of scalability and flexibility, it comes with increased complexity and potential challenges in terms of consistency and development overhead. It is important to carefully consider whether the benefits align with the specific requirements and goals of the application being developed.

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In the ever-changing world of web development, selecting a front-end framework is analogous to deciding on a skyscraper's foundation. It must be tough, adaptable, and well-suited to the job at hand. Understanding the subtleties of multiple frameworks is critical for creating seamless and responsive user interfaces as developers. This essay delves into the complexities of various prominent frontend frameworks, including React.js, Angular, Vue.js, Svelte, and Ember.js, revealing their distinct capabilities and optimal use cases.

React.js
React.js, a Facebook product, is at the forefront of frontend development. Its claim to fame is its component-based architecture, which allows for the creation of modular and reusable user interfaces. The virtual DOM in React assures optimal rendering speed, making it an excellent choice for single-page applications (SPAs) and scenarios requiring real-time changes.

Case Studies

• React's ability to swiftly update and render components makes it a standout performer for SPAs, giving users with a seamless and dynamic experience.
• Component-Based Architecture: React.js is extremely useful for developers who want a modular and scalable development strategy. Code reuse and maintainability are aided by the ability to design self-contained components.
• Real-Time Applications: From live conversations to collaborative editing, React's virtual DOM shines in applications requiring rapid updates and real-time interactions.

Angular
Angular is a full-fledged framework developed by Google that is meant for sturdy and feature-rich apps. Its Model-View-Controller (MVC) architecture offers a structured framework for large-scale projects. The robust capabilities in Angular's armory, including as two-way data binding and dependency injection, make it a force to be reckoned with in enterprise-level applications.

Use Cases

• Enterprise-level Applications: Angular's comprehensive feature set and MVC architecture make it a powerhouse for building large-scale applications with complex requirements.
• Progressive Web Apps (PWAs): With built-in service workers and a focus on performance, Angular is a go-to choice for crafting high-quality PWAs that deliver a native app-like experience.
• Data-Intensive Applications: Projects requiring heavy data manipulation benefit from Angular's two-way data binding, simplifying the process of managing and updating data.

Vue.js
Vue.js is a frontend framework that stands out for its simplicity and versatility. Vue.js, created by Evan You, has a progressive approach, allowing developers to smoothly integrate it into projects of varied sizes. Because of its lightweight nature and adaptability, it is an ideal solution for small to medium-sized projects, as well as scenarios requiring rapid prototyping.

Use Cases
Small to Medium-sized Projects: Vue.js's lightweight nature and easy learning curve make it an excellent fit for projects where simplicity and efficiency are paramount.
Prototyping: Rapid prototyping becomes a breeze with Vue.js, as its simplicity allows developers to iterate quickly over designs and concepts.
Highly Customizable Projects: Vue.js offers a high degree of customization, making it suitable for projects that demand tailored solutions and adaptability.

Svelte
Svelte, a relative newcomer to the frontend scene, takes a different approach by shifting the heavy lifting from the browser to the build step. It compiles components into highly optimized JavaScript at build time, resulting in smaller and faster applications.

Use Cases

• Performance-Critical Applications: Svelte's compilation approach results in highly optimized code, making it suitable for applications where performance is a top priority.
• Developer Experience: With a syntax that closely resembles standard HTML and JavaScript, Svelte offers a refreshing developer experience, reducing boilerplate code and enhancing readability.
• Small to Medium-sized Projects: Svelte's compilation model makes it an efficient choice for smaller projects where rapid development is crucial.

Ember.js

Ember.js, an opinionated framework, comes with conventions that guide developers through the entire application development lifecycle. It focuses on productivity and developer happiness by providing a set structure and conventions for building ambitious web applications.

Use Casesarge-Scale Applications: Ember.js shines in projects requiring a high level of organization and structure, making it an excellent choice for large-scale applications.

• Opinionated Development: Teams that prefer clear conventions and predefined structures benefit from Ember.js's opinionated approach, reducing decision fatigue and promoting consistency.
• Long-term Maintenance: The conventions and structure of Ember.js contribute to long-term maintainability, making it suitable for projects with extended lifecycles.

Conclusion

In the dynamic landscape of frontend development, the choice between React.js, Angular, Vue.js, Svelte, and Ember.js is a nuanced decision influenced by the specific needs of each project. React.js excels in SPAs and real-time applications, Angular proves its mettle in enterprise-level and data-intensive projects, Vue.js provides a lightweight and flexible solution for smaller projects and rapid prototyping, Svelte offers optimized performance with a unique compilation approach, and Ember.js provides a structured, opinionated framework for large-scale applications. By carefully considering the unique features and strengths of each framework, developers can make informed decisions that align with project requirements, ensuring the successful creation of web applications that stand the test of time.

The Repository Pattern is a popular design pattern for separating data access and manipulation logic from the rest of the application. While the Repository Pattern is more frequently linked with backend or server-side development, you can still use a variant of it in Angular for data management. Here's an example of how to use Angular to construct a simplified version of the Repository Pattern:

Make a Repository
To handle data operations, create a repository. Create a file called user.repository.ts with the following code:

import { Injectable } from  ‘@angular/core’;
import { HttpClient } from ‘@angular/common/http’;
import { Observable } from ‘rxjs’;
import { User } from ‘./user.model’;
@Injectable({
providedIn: ’ root ’ ,
})
 export class UserRepository {
private apiUrl = ‘https://api.example.com/users’;
constructor(private http: HttpClient) {}
getAllUsers(): Observable<User[]>{
                return this.http.get<User[]>(this.apiUrl);
}
getUserById(id:number): Observable<User>{
                return this.http.get<User>(‘${this.apiUrl}/${id}’);
}
createUser(user:User): Observable<User>{
                return this.http.post<User>(this.apiUrl,user);
}
updateUser(user:User): Observable<User>{
                return this.http.put<User>(>(‘${this.apiUrl}/${user.id}’, user);
}
deleteUser(id:number): Observable<any>{
                return this.http.delete(>(‘${this.apiUrl}/${id}’);
}
}

Use the Repository in a Component
Make a component that makes use of the repository for data operations. Create a file called user.component.ts with the following code:

import { Component,OnInit } from ‘@angular/core’;
import { User } from ‘./user.model’;
import { UserRepository } from ‘./user.repository’;
@Component({
     selector: ‘app-user’,
     template:’
       <h2>User Component</h2>
        <ul>
             <li *ngFor=”let user of users”>{{ user.name}}</li>
        </ul>
})
export class UserComponent implements OnInit {
    users:User[];
    constructor( private userRepository: UserRepository) {}
    ngOnInit(): void {
       this.loadUsers();
    }
    loadUsers():void{
     this.userRepository.getAllUsers().subscribe((users:User[]) => {
            this.users = users;
     });
    }
}

Activate the Repository
Import the UserRepository into the app.module.ts file. Include it in the providers array of the @NgModule decorator. As an example:

import { NgModule } from ‘@angular/core’;
import { BrowserModule } from ‘@angular/platform-browser’;
import { HttpClientModule } from ‘@angular/common/http’;
import { UserRepository } from ‘./user.repository’;
import { UserComponent } from ‘./user.component’;
@NgModule({
       declarations: [UserComponent],
       imports : [BrowserModule,HttpClientModule],
       providers : [UserRepository],
       bootstrap : [UserComponent],
})
export class AppModule {}

Create and launch the program
To build and serve the Angular application, use the following command:

ng provide

Your app will be available at http://localhost:4200.

The UserRepository in this example encapsulates the data operations for managing users. The repository is used by the UserComponent by injecting it into its constructor and using its methods to retrieve user data.

You separate the code for data access and manipulation from the components by using this simplified version of the Repository Pattern in Angular. This encourages code reuse, testability, and maintainability while also providing a clear interface for working with the data layer.

What exactly is Angular routing?
Angular routing is a useful feature that allows you to create single-page applications (SPAs) by allowing navigating between different views or components within your Angular application without having to reload the entire page. Angular routing, as opposed to traditional server-side navigation, which results in a new HTTP request and a whole new page for each link or action, provides a seamless and dynamic user experience within the same page. Routing is extremely important in online development, especially in the context of single-page applications (SPAs) and current web frameworks.

Navigation in a Single-Page Application (SPA)
The program runs within a single HTML page with SPAs, and routing allows users to navigate between different views or areas of the application without having to reload the entire page. This leads in a more fluid and responsive user experience.

Loading of Dynamic Content
By allowing components or views to be loaded asynchronously as needed, routing enables dynamic content loading. This is especially significant for large applications with a high number of components because it aids in improving the first page load time.
enhanced user experience

Routing adds to a more pleasant and seamless user experience. Users can move between portions of the application with smooth transitions, giving the application the appearance of a regular desktop application.

Structure of Modular Application
Routing encourages the application to have a modular structure. Each route can be linked to a different component or feature, resulting in a better ordered and maintainable codebase. Let's start with a basic blog project to learn about routing in Angular.

Step 1. Create a New Angular Project
ng new my-blog

Follow the prompts to set up your project. You can choose options like stylesheets format (CSS, SCSS, etc.) and whether you want Angular routing or not.

Step 2. Navigate to the Project Directory
cd my-blog

For Example path. D:\CSharpCorner\Project\Angular which contain Project my-blog  we need to navigate into the Folder by using cd command in Terminal.
cd D:\CSharpCorner\Project\Angular\my-blog.

Step 3.  Create Components
ng generate component home
ng generate component about
ng generate component Services
ng generate component Blog

Step 4. Set Up Routes
Open the src/app/app-routing.module.ts file, which Angular CLI generates if you choose routing during project creation. Configure your routes in this file.
import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';

import { HomeComponent } from './home/home.component';
import { AboutComponent } from './about/about.component';
import { ServicesComponent } from './services/services.component';
import { BlogComponent } from './blog/blog.component';

const routes: Routes = [
  { path: '', component: HomeComponent },
  { path: 'about', component: AboutComponent },
  { path: 'services', component: ServicesComponent },
  { path: 'blog', component: BlogComponent },
];
@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

Step 5. Update App Module
Open src/app/app.module.ts and make sure to import and include the AppRoutingModule.
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { HomeComponent } from './home/home.component';
import { AboutComponent } from './about/about.component';
import { ServicesComponent } from './services/services.component';
import { BlogComponent } from './blog/blog.component';

@NgModule({
  declarations: [
    AppComponent,
    HomeComponent,
    AboutComponent,
    ServicesComponent,
    BlogComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Step 6. Update App Component HTML
Update src/app/app.component.html to include the <router-outlet> directive.
<!-- app.component.html -->

<header>
  <nav>
    <ul>
      <li><a routerLink="/" routerLinkActive="active">Home</a></li>
      <li><a routerLink="/about" routerLinkActive="active">About</a></li>
      <li><a routerLink="/services" routerLinkActive="active">Services</a></li>
      <li><a routerLink="/blog" routerLinkActive="active">Blog</a></li>
    </ul>
  </nav>
</header>

<main>
  <!-- Your router-outlet or other content goes here -->
  <router-outlet></router-outlet>
</main>

JavaScript

Step 7. Update App Component CSS

Update src/app/app.component.css file.

/* styles.scss */

/* Reset some default margin and padding for the page */
body, h1, h2, h3, p {
  margin: 0;
  padding: 0;
}

/* Apply a basic style to the header */
header {
  background-color: #333;
  color: white;
  padding: 10px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Style the logo */
.logo img {
  height: 40px; /* Adjust the height as needed */
}

/* Style the navigation menu */
nav ul {
  list-style: none;
  display: flex;
}

nav ul li {
  margin-right: 20px;
}

nav ul li a {
  text-decoration: none;
  color: white;
  font-weight: bold;
  font-size: 16px;
  transition: color 0.3s ease-in-out;
}

nav ul li a:hover {
  color: #ffcc00; /* Change to your desired hover color */
}

/* Apply some spacing for the main content */
main {
  padding: 20px;
}

Step 8. Serve the Application
Run the application using the following command.
ng serve -o

You should see your basic Angular app with routing in action.

Step 9. Test Navigation
Click on the "Home" and "About" links to see the content of the corresponding components being displayed without full page reloads.

Summary
Angular routing enhances user experience in SPAs by enabling seamless navigation.Routing allows for dynamic content loading, optimizing performance.A modular application structure is encouraged through the association of routes with specific components.

The provided steps demonstrate the creation of a simple blog project with Angular routing.

If you encounter any issues or have further questions, feel free to let me know, and I'll be glad to assist.

Thank you for reading, and I hope this post has helped provide you with a better understanding of  Routing in Angular.

"Keep coding, keep innovating, and keep pushing the boundaries of what's possible.

Happy Coding.

In this article, we will look at the fundamentals of Angular components, examining their importance and the important features that make them necessary for modern web development. By the conclusion, you'll have a firm understanding of Angular's components.

Google's Angular is a popular open-source web application framework for developing dynamic web apps. The concept of components, which serve as the framework's building blocks, is central to Angular.  It's commonly used to create dynamic, single-page web apps. The component-based architecture of Angular is one of its primary characteristics.

A component is an essential component of a user interface. It is a reusable and modular structure that wraps a portion of the application's functionality and user interface. Components are in charge of establishing the structure of a UI component and managing the logic associated with that component. Each Angular component is made up of a TypeScript class and a template.

To create a new component, use the following command. Change "my-component" to whatever name you desire for your component.
ng generate component my-component

Components in Angular serve multiple functions, and their utilization is critical to the framework's architecture. Here's why components are so important in Angular development:

• Modularity is promoted via components, which divide down the user interface into smaller, reusable, and manageable sections. Each component contains a specific portion of the user interface and its accompanying logic.
• Components can be reused across multiple portions of the program, making code maintenance and updating easy. Reusable components help to make the development process more efficient and scalable.
• Components improve code readability and maintainability by grouping it into logical and self-contained sections. This organizational structure facilitates developers' understanding, maintenance, and collaboration on the codebase.
• Data Binding: Components enable sophisticated data binding techniques, enabling for smooth data and user interface synchronization. This streamlines the handling of user input and application state updates.
• Components include lifecycle hooks, which allow developers to access various stages of a component's life. This is useful for tasks such as initialization, cleanup, and responding to changes.
• Components adhere to the idea of separation of concerns by splitting the application logic into discrete sections. This division facilitates the management and testing of various components of the application.

An Angular component's main characteristics

1. Typescript Component Class
The component class is built in TypeScript and contains the component's logic.
It often includes attributes and methods that specify the component's behavior.
The component class's properties can be tied to the component's template, allowing for dynamic modifications.

Example
// app.component.ts
import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'My Angular App';
  // Other properties and methods can be defined here
}

2. Decorator of Components
The '@Component' decorator is used to define the component's metadata. The selector, template, and styles are all part of this. The'selector' is a CSS selector that identifies a template component. It is used to incorporate the component into other templates. The 'templateUrl' indicates the location of the component's HTML template file.

The array'styleUrls' contains URLs to external style sheets that will be applied to the component.

3. HTML template
The template is an HTML file that defines the structure of the view of the component. To improve the dynamic behavior of the UI, Angular uses a specific vocabulary in templates, including data binding, directives, and other capabilities.

Example
<!-- app.component.html -->
<h1>{{ title }}</h1>
<p>This is my Angular application.</p>

4. CSS/SCSS Styles
The styles define the component's look.
Styles can be defined directly in the '@Component' decorator's'styles' property or in external style sheets referenced via the'styleUrls' property.

Example

/* app.component.css */
h1 {
  color: blue;
}

5. Integration of Modules
Components must be included in an Angular module. The module specifies which components are associated with it.
The 'declarations' array in the module metadata lists all of the module's components, directives, and pipes.

Example

// app.module.ts
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';

@NgModule({
  declarations: [AppComponent],
  imports: [BrowserModule],
  bootstrap: [AppComponent]
})
export class AppModule {}

6. Data Binding
Components can communicate with the template using data binding. There are different types of data binding in Angular, including one-way binding ( '{{ expression }} ') property binding ( '[property]="expression" '), and event binding ( '(event)="handler" ').

Example

<!-- app.component.html -->
<p>{{ title }}</p>
<button (click)="changeTitle()">Change Title</button>
 ' ' '

 ' ' 'typescript
// app.component.ts
export class AppComponent {
  title = 'My Angular App';

  changeTitle() {
    this.title = 'New Title';
  }
}

In conclusion, Angular components are essential for developing modular and maintainable apps. They are made up of a TypeScript class that has been annotated with a decorator that provides metadata such as selector, template, and styles. The structure is defined by the template, the appearance by the styles, and the logic and data are handled by the component class.

If you run into any problems or have any additional questions, please let me know and I'll be happy to help.

Thank you for reading, and I hope this post has helped you gain a better grasp of Angular Components.

"Keep coding, innovating, and pushing the limits of what's possible."

Have fun coding.

In this blog post, we'll go over how to build an Angular application that allows users to directly capture photographs from their webcams. To accomplish this, we'll use the ngx-webcam library, which includes webcam capabilities and covers the library's installation as well as the basic setup of the Angular application in the project.

Step 1: Begin by creating a new Angular project.

If you haven't previously, enter the following command in your terminal or command line to install the Angular CLI globally:
npm install -g @angular/cli

Make a new Angular project as follows:
ng new CaptureImage

Go to the project directory:
cd D:\Angular\Project\CaptureImage

Step 2: Set up the ngx-webcam Library.
npm install ngx-webcam

Step 3: Incorporate ngx-webcam into your Angular app.
Import the WebcamModule from ngx-webcam into the src/app/app.module.ts file:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { ImageWebcamComponent } from './image-webcam/image-webcam.component';
import { WebcamModule } from 'ngx-webcam';

@NgModule({
  declarations: [
    AppComponent,
    ImageWebcamComponent,
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    WebcamModule,
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Step 4: Make a Webcam Component
Make a new component to manage webcam functionality. Run the following command in your terminal:
ng generate component image-webcam

Open src/app/image-webcam/image-webcam.component.ts and add the following logic to capture images:

import { Component } from '@angular/core';
import { Observable, Subject } from 'rxjs';
import { WebcamImage, WebcamInitError, WebcamUtil } from 'ngx-webcam';
@Component({
  selector: 'app-image-webcam',
  templateUrl: './image-webcam.component.html',
  styleUrls: ['./image-webcam.component.css']
})
export class ImageWebcamComponent {

  private trigger: Subject<any> = new Subject();
  webcamImage: any;
  private nextWebcam: Subject<any> = new Subject();

  sysImage = '';

  ngOnInit() {}

  public getSnapshot(): void {
    this.trigger.next(void 0);
  }

  public captureImg(webcamImage: WebcamImage): void {
    this.webcamImage = webcamImage;
    this.sysImage = webcamImage!.imageAsDataUrl;
    console.info('got webcam image', this.sysImage);
  }

  public get invokeObservable(): Observable<any> {
    return this.trigger.asObservable();
  }

  public get nextWebcamObservable(): Observable<any> {
    return this.nextWebcam.asObservable();
  }
}

Add the following code to src/app/image-webcam/image-webcam.component.html.

<div class="container mt-5">
  <h2>Angular Webcam Capture Image from Camera</h2>

  <div class="col-md-12">
    <webcam
      [trigger]="invokeObservable"
      (imageCapture)="captureImg($event)"
    ></webcam>
  </div>
  <div class="col-md-12">
    <button class="btn btn-danger" (click)="getSnapshot()">
      Capture Image
    </button>
  </div>
  <div class="col-12">
    <div id="results">Your taken image manifests here...</div>

    <img [src]="webcamImage?.imageAsDataUrl" height="400px" />
  </div>
</div>

Step 5: Incorporate the Webcam Component
Add the following code to src/app/app.component.html:
<app-image-webcam></app-image-webcam>
<router-outlet></router-outlet>

Step 6: Execute your Angular Application
ng ng serve -o

Your Angular application should now have webcam capabilities. This section covers the fundamentals of integrating the ngx-webcam library into an Angular project.
If you run into any problems or have any additional questions, please let me know and I'll be happy to help.
Thank you for reading, and I hope this post has given you a better knowledge of how to use ngx-webcam to capture webcam images in Angular.
"Keep coding, innovating, and pushing the limits of what's possible."

Have fun coding.

When it comes to document sharing, Adobe's Portable Document Format (PDF) is critical for maintaining the integrity of text-rich and aesthetically pleasing data. Access to online PDF files often necessitates the use of a certain application. Many prominent digital publications now need PDF files. Many companies utilize PDF files to create expert documentation and invoices. Additionally, developers usually employ PDF document generating libraries to meet specific client requirements. The introduction of contemporary libraries has simplified the process of creating PDFs.

What exactly is Node.js?
Node.js is a cross-platform, open-source server environment that works with Windows, Linux, Unix, macOS, and other operating systems. Node.js is a JavaScript back-end runtime environment that uses the V8 JavaScript engine to execute JavaScript code outside of a web browser.

Developers can utilize JavaScript to construct server-side scripts and command-line tools with Node.js. Dynamic web page content is commonly built before a page is sent to a user's web browser by utilizing the server's ability to run JavaScript code. Node.js promotes a "JavaScript everywhere" paradigm that unifies online application development around a single programming language, as opposed to using several languages for server-side and client-side programming.

const PDFDocument = require('pdfkit');
const fs = require('fs');
const doc = new PDFDocument();
doc.text('Hello world', 100, 100)
doc.end();
doc.pipe(fs.createWriteStream('Output.pdf'));

PDFmake
A wrapper library for PDFKit is called pdfmake . The programming paradigm is where there is the most difference:

While pdfmake uses a declarative approach, pdfkit uses the traditional imperative technique. Because of this, concentrating on what you want to perform is simpler than spending time instructing the library on how to get a particular outcome.

But not everything that glitters is gold, and using Webpack and trying to integrate bespoke fonts may cause problems. Unfortunately, there isn't much information regarding this problem available online. If you don't use Webpack, you can still easily clone the git repository and run the script for embedded font.

var fonts = {
  Roboto: {
    normal: 'fonts/Roboto-Regular.ttf',
    bold: 'fonts/Roboto-Medium.ttf',
    italics: 'fonts/Roboto-Italic.ttf',
    bolditalics: 'fonts/Roboto-MediumItalic.ttf'
  }
};

var PdfPrinter = require('pdfmake');
var printer = new PdfPrinter(fonts);
var fs = require('fs');

var docDefinition = {
  // ...
};

var options = {
  // ...
}

var pdfDoc = printer.createPdfKitDocument(docDefinition, options);
pdfDoc.pipe(fs.createWriteStream('output.pdf'));
pdfDoc.end();

jsPDF
Among the PDF libraries on GitHub, jsPDF is a PDF generation library for browsers. It has the most starts, and this is not a coincidence given how reliable and well-maintained it is. Because the modules are exported in accordance with the AMD module standard, using them with nodes and browsers is simple.

For PDFKit, the offered APIs follow an imperative paradigm, making it difficult to create complicated layouts. Including typefaces The only additional step is to convert the fonts to TTF files, which is not difficult. Although jsPDF is not the simplest library to use, the extensive documentation ensures that you won't run into any specific difficulties when using it.

import { jsPDF } from "jspdf";
const doc = new jsPDF();
doc.text("Hello world!", 10, 10);
doc.save("output.pdf");

Puppeteer
Puppeteer is a Node library that offers a high-level API to manage Chrome, as you may know, but it can also be used to as PDF generator. Because the templates must be written in HTML, jsPDF is fairly simple for web developers to use.

Puppeteer has mostly two drawbacks. You must put a backend solution in place. Puppeteer must be launched each time a PDF needs to be created, adding to the burden. It moves slowly.

It might be an excellent solution if the aforementioned drawbacks are not a major issue for you, especially if you need to construct HTML tables and other such things.
const puppeteer = require('puppeteer')

async function printPDF() {
  const browser = await puppeteer.launch({ headless: true });
  const page = await browser.newPage();
  await page.goto('www.google.com', {waitUntil: 'networkidle0'});
  const pdf = await page.pdf({ format: 'A4' });
  await browser.close();
  return pdf
})

While pdfmake is based on PDFKit, pdf-lib is a library for producing and editing PDFs that is entirely written in Typescript. Even though it was launched after all the other libraries, it has thousands of stars on GitHub, indicating how well-liked it is.

The APIs have a fantastic design and naturally function with both browsers and nodes.It offers many features that other libraries simply don't have, including PDF merging, splitting, and embedding;

Although it is quite powerful, pdf-lib is also very user-friendly. One of the most popular features is the ability to embed font files using Unit8Array and ArrayBuffer, which enables using fs while dealing with nodes and xhr when working in the browser.

When you compare it to other libraries, you'll be able to tell that it performs better, and you can utilize Webpack with it, of course. Additionally, this library uses an imperative approach, which makes it difficult to work with complex layouts.
import { PDFDocument } from 'pdf-lib'

// PDF Create
const pdfDoc = await PDFDocument.create()
const page = pdfDoc.addPage()
page.drawText('Hello World')
const pdfBytes = await pdfDoc.save()

IronPDF
IronPDF for Node.js renders PDFs from HTML strings, files, and web URLs by using the robust Chrome Engine. It is advised to assign this operation to the server side since rendering can be computationally demanding. In order to offload the computational effort and await the outcome, frontend frameworks like ReactJs and Angular can communicate with the server. The outcome can then be shown on the front end side.

Software engineers may produce, modify PDF documents, and extract PDF material with the use of the IronPDF library, which was created and maintained by Iron Software.

When it comes to
    the creation of PDF documents using HTML, URL, JavaScript, CSS, and a variety of image formats
    A signature and headers should be included.
    Add, Copy, Split, Merge, and Delete PDF Pages
    Can able to include CSS properties.
    Performance improvement Async and complete multithreading support

import {PdfDocument} from "@ironsoftware/ironpdf";

(async () => {
  const pdf = await PdfDocument.fromHtml("<h1>Hello World</h1>");
  await pdf.saveAs("Output.pdf");
})();

Let's look at the differences between npm, yarn, and pnpm in this blog. Package managers such as npm, yarn, and pnpm are extensively used in the JavaScript ecosystem to manage dependencies and packages for Node.js projects. They take different approaches and have distinct features, which can affect how they manage packages and interact with your project.

npm

npm is the default package manager for Node.js and is included with the installation of Node.js. It has a lengthy history and is frequently used in the JavaScript ecosystem. To store and distribute packages, npm makes use of a centralized package registry known as the npm registry. It adds a "node_modules" directory to your project and installs all project dependencies there.

// Install a package
npm install package-name

//Update a package
npm update package-name

// Remove a package
npm uninstall package-name

yarn

// Install a package
yarn add package-name

// update a package
yarn upgrade package-name

// Remove a package
yarn remove package-name

pnpm

pnpm is another package manager for Node.js projects. It aims to solve the issue of disk space usage by using a unique approach. Instead of creating a separate "node_modules" directory for each project, pnpm uses a single global package store and creates symlinks to the required packages in each project's "node_modules" directory. This can significantly reduce the amount of disk space used by your projects.

// Install a package
pnpm add package-name

// update a package
pnpm update package-name

//Remove a package
pnpm remove package-name

HostForLIFE.eu Node.js Hosting
HostForLIFE.eu is European Windows Hosting Provider which focuses on Windows Platform only. We deliver on-demand hosting solutions including Shared hosting, Reseller Hosting, Cloud Hosting, Dedicated Servers, and IT as a Service for companies of all sizes. We have customers from around the globe, spread across every continent. We serve the hosting needs of the business and professional, government and nonprofit, entertainment and personal use market segments.

Dependency Injection (DI) is a core Angular design pattern that aids in the management of dependencies as well as the flow of data and services inside an application. It allows for loose coupling between components, which makes your code more modular, maintainable, and testable.

Why are We using Dependency Injection and without dependency using what problem in real-life example?

Real-Life Example: A Car Factory
Imagine you're managing a car manufacturing factory. In your factory, you have various assembly lines responsible for different parts of the car, such as the engine, chassis, electronics, and tires. Each assembly line relies on specific tools and materials to complete its tasks.

Now, think about how you might manage these dependencies in your car factory.

• No Dependency Injection (DI): Without dependency injection, each assembly line would have to manage its own dependencies. For example:
  • The engine assembly line would need to procure and maintain its own inventory of engines, tools, and spare parts.
  • The electronics assembly line would need to do the same for electronic components.
  • The tire assembly line would need its own inventory of tires and tire-related equipment.

• This approach would lead to several problems.
  • Duplication of effort: Each assembly line would have to manage its dependencies separately, resulting in duplicated resources and potential inconsistencies.
  • Maintenance nightmare: If a tool or part needed to be updated or replaced, every assembly line using that tool or part would need to be individually updated.
  • Lack of flexibility: Changing or upgrading components or tools across multiple assembly lines would be challenging and error-prone.

• Dependency Injection (DI) in the Car Factory: Now, let's introduce dependency injection into the car factory.
  • You create a central inventory management system (akin to Angular's dependency injection container).
  • Each assembly line declares its dependencies on the central system.
  • When an assembly line needs an engine, electronics, or tires, it requests them from the central inventory system (dependency injection).
  • The central system ensures that each assembly line gets the correct parts and tools.

• Benefits of this approach.
  • Centralized control: You have a single point of control for managing all dependencies, making it easier to update, replace, or upgrade tools and components.
  • Consistency: All assembly lines use the same source for their dependencies, ensuring consistency and reducing errors.
  • Flexibility: You can easily switch out components or tools across the factory by updating the central inventory system.

In Angular
In Angular applications, components, services, and other parts of the application often have dependencies. Dependency injection works similarly to the car factory example:

Angular's DI container manages dependencies and ensures that each component or service gets the correct instances of the dependencies it needs.
This promotes modularity, maintainability, and testability in your Angular application, as you can easily swap out components or services without modifying each dependent part individually.

So, in both the car factory and Angular, dependency injection simplifies management, promotes consistency, and makes it easier to adapt to changes in the dependencies, ultimately leading to more efficient and maintainable systems.

In Angular How to Achieve!
In Angular, dependency injection is achieved through the built-in dependency injection system. Here's how you can achieve dependency injection in Angular.

Step 1. Create Service in your Application
First, you need to create a service that provides the functionality or data you want to inject into other components. Services are classes annotated with the @Injectable decorator. What are the services using this Application? All the functionalities of the service to implemented in the servicefile.

import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { environment } from 'src/environments/environment';

@Injectable({
  providedIn: 'root'
})

export class EmployeeService {

  EmpApi= environment.EmployeeAPI;
  constructor(private http:HttpClient) { }

  GetEmployeeList(){
    return this.http.get(this.EmpApi+'Employee/List');
  }
}

Step 2. Inject Service into Components
Next, you inject the service into the components or other services where you need it. You can do this by including the service as a parameter in the constructor of the component or service that requires it. Angular's dependency injection system will take care of providing an instance of the service automatically.

import { Component, OnInit } from '@angular/core';
import { EmployeeService } from 'src/app/Service/employee.service';
import { FormBuilder, FormGroup } from '@angular/forms';
import { Router } from '@angular/router';

@Component({

  selector: 'app-employee-list',
  templateUrl: './employee-list.component.html',
  styleUrls: ['./employee-list.component.css']

})

export class EmployeeListComponent implements OnInit  {

  collectionData: any;
  iframeSrc!: string;
  constructor( private empService:EmployeeService,private route: Router){

  }

  ngOnInit(): void {
   this.empList();
  }

  empList(){
    return this.empService.GetEmployeeList().subscribe((res:any)=>{
      this.collectionData=res.data;

    })
  }
}

Conclusion
That's it! With these steps, you've achieved dependency injection in Angular. The Angular framework will take care of creating and managing the service instances and injecting them where needed, promoting modularity and maintainability in your application.

In this post, I'll show you how to increase your productivity using.NET Core CLI Commands and how to use.NET Core CLI (Command Line Interface) commands to assist developers speed up their work with a few tips and tricks. We can create, build, add packages, restore packages, run apps, and deploy Core applications using the.Net CLI. I'll go over basic operations like establishing new projects, compiling and running programs, managing dependencies, and working with NuGet packages.

Increasing Productivity with the Command Line Interface in Visual Studio
When we develop a new application in Visual Studio, we use.Net CLI commands internally to create, build, add packages, launch, and deploy apps.

When you install the.NET Core SDK, the.NET Core CLI is also installed by default. As a result, no additional installation is required.CLI for Net Core.
How can I tell if.Net CLI is installed or not?

Open Run and type CMD.

When the command prompt appears, type dotnet and press enter.

CLI Command Syntax: dotnet command> argument> option>
Take note that all commands begin with dotnet. The syntax shown above will assist developers in executing essential instructions from the command-line interface. Let's use the first command (dotnet help) to get help for all commands.

How do I obtain a complete list of all.Net Core commands?

List of all .Net Core commands

Below is a list of all .Net core commands that will appear once we run the "dotnet help" command. Let's list down all commands as below with a short description of what each does.

SDK commands

• add:  Add a package or reference to a .NET project
• build: Build a .NET project
• build-server: Interact with servers started by a build
• clean: Clean build outputs of a .NET project
• format: Apply style preferences to a project or solution
• help: Show command line help
• list: List project references of a .NET project
• msbuild: Run Microsoft Build Engine (MSBuild) commands.
• new: Create a new .NET project or file.
• NuGet: Provides additional NuGet commands.
• pack: Create a NuGet package.
• publish: Publish a .NET project for deployment
• remove: Remove a package or reference from a .NET project.
• restore: Restore dependencies specified in a .NET project.
• run: Build and run a .NET project output.
• SDK: Manage .NET SDK installation.
• sln: Modify Visual Studio solution files.
• store: Store the specified assemblies in the runtime package store.
• test: Run unit tests using the test runner specified in a .NET project.
• tool: Install or manage tools that extend the .NET experience.
• vstest:  Run Microsoft Test Engine (VSTest) commands.
• workload: Manage optional workloads.

How to create a new console project?
Let's create a new console project using the "dotnet new" Command.
dotnet new console -n MyConsoleAppUsingCLI -o C:\Users\XXXXX\projects\MyConsoleAppUsingCli

Once the above Command runs successfully, We are able to create a console application with the name "MyConsoleAppUsingCli" at the given path "C:\Users\XXXXX\projects\". Let's build the newly created project using the build command.

Build Command: dotnet build C:\Users\peter\projects\MyConsoleAppUsingCli\

Once we run the build command, As per the above screen, the project build succeeded.

How to add a package reference to the new console application?
Let's add a package reference to the new console application using the add package CLI command.

We have added the package "Microsoft.EntityFrameworkCore" to our project. Let's open our console app in Visual Studio and check the newly added package reference in the solution.

As per the above screen, We are able to see Microsoft.EntityFrameworkCore package reference was added successfully.

Run the project using Run CLI Command
Run project using Run CLI Command: dotnet run --project C:\Users\peter\projects\MyConsoleAppUsingCli\MyConsoleAppUsingCli.csproj

In this article, I have demonstrated how to boost productivity with Visual Studio's command-line interface. CLI is very powerful and is used for developing, running, and publishing applications. We have covered essential commands like creating new projects, compiling and running applications, managing dependencies, and handling NuGet packages in console applications. Here I have explained the basic commands required to set up a project and run the new project, but you can explore more on other commands and leverage the power of the.NET Core CLI for streamlined and productive development projects.