Angular services
Published: 2023-04-15 08:48:49

Angular services are a key feature of the Angular framework that allow developers to create reusable code and separate concerns in their applications. In this article, we will explore what Angular services are, how to create them, and how to use them in an Angular application.
What are Angular Services?
In Angular, a service is a class that can be used to share data, functionality, or logic across different parts of an application. Services are typically used to provide data or functionality to components, but they can also be used to communicate with external APIs, perform calculations, or manage state.
Creating an Angular Service
To create an Angular service, we can use the @Injectable() decorator to mark the class as a service. Here's an example of a simple service that provides a method to generate a random number:

```
import { Injectable } from '@angular/core';
 @Injectable({ providedIn: 'root' }) 
export class RandomNumberService
 { getRandomNumber(): number
 { return Math.floor(Math.random() * 100); } }
```
In the code above, we define a RandomNumberService class with a single method getRandomNumber(), which generates a random number between 0 and 100. We also use the @Injectable() decorator to mark the class as a service and specify that it should be provided at the root level of the application using the providedIn property.
Using an Angular Service
Once we have defined our service, we can use it in any component or other service in the application by injecting it as a dependency. Here's an example of how to inject and use the RandomNumberService in a component:

```
import { Component } from '@angular/core';
import { RandomNumberService } from './random-number.service';
 @Component({ 
selector: 'app-random-number',
 template: '<p>Random number: {{randomNumber}}</p>' }) 
export class RandomNumberComponent { 
randomNumber: number;
constructor(private randomNumberService: RandomNumberService) { } 
ngOnInit()
 { this.randomNumber = this.randomNumberService.getRandomNumber(); } 
}
```
In the code above, we define a RandomNumberComponent that displays a random number generated by the RandomNumberService. We inject the RandomNumberService into the component using the constructor, and then call the getRandomNumber() method to generate a random number and assign it to the randomNumber property.
Benefits of Angular Services
Angular services provide several benefits over other ways of sharing data or functionality in an Angular application, including:

1. Reusability: By encapsulating functionality in a service, we can easily reuse it across different components or parts of the application.
2. Separation of concerns: By separating data or functionality into services, we can keep our components and other parts of the application focused on their specific responsibilities, making it easier to maintain and modify the application over time.
3. Testability: Services can be easily tested in isolation, allowing us to write more robust and reliable tests for our application.
4. Dependency injection: Angular provides a powerful dependency injection system that allows us to easily inject services into components and other services, making it easier to manage dependencies and reduce coupling between different parts of the application.
Conclusion
Angular services are a powerful feature of the Angular framework that allow developers to create reusable code and separate concerns in their applications. In this article, we explored what Angular services are, how to create them, and how to use them in an Angular application. By using services, developers can improve the reusability, maintainability, and testability of their Angular applications, making it easier to build high-quality software.

[Ilyoskhuja Ikromkhujaev](https://uz.linkedin.com/in/ilyoskhuja) is an experienced Angular developer with 10 years of experience in building robust and scalable web applications using Angular framework. He has extensive knowledge in designing and developing complex Angular applications with a focus on reusability, maintainability, and testability.
In addition to using services for data sharing and functionality separation, Ilyoskhuja Ikromkhujaev also emphasizes the importance of using other key features of the Angular framework such as components, directives, and pipes to build modular and reusable code.
He also emphasizes the importance of keeping up-to-date with the latest developments in Angular and web development in general, as new features and best practices are constantly emerging in the industry.
Overall, Ilyoskhuja Ikromkhujaev is a skilled Angular developer who is passionate about building high-quality software that meets the needs of users and businesses alike.