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dependency injection angular

What is Dependency Injection in Angular?

Aman Jain, June 20, 2021November 8, 2023

In a simple term we can say dependency injection in angular are created once at the time of initialisation of service or component then throughout the application we can reuse same object without re-initialisation.

So, this is clear now advantage of dependency injection is to not creating the object in each component and maintain the state of service.

Creating a injectable service:

ng generate service test

it will create a service named test

import { Injectable } from '@angular/core';

@Injectable({
  providedIn: 'root',
})
export class TestService {
  constructor() { }
}

In the above code @Injectable is a decorator which specifies that Angular can use this class in the DI system.

We can pass multiple metadata in decorator to describe the functionality of component, here we have defined providedIn which means this service can be used in any component.

import { Injectable } from '@angular/core';


@Injectable({
  providedIn: 'root',
})
export class TestService {
  myTests=[{id:1,name:"test1"}]
  constructor(private logger: Logger) {  }

  getAllTest() {
     
    return this.myTests;
  }
}

We created a function getAllTest and we can use it in our component or other services.

import { Component, OnInit } from '@angular/core';
 
 

@Component({
  selector: 'app-test-service,
  templateUrl: './test-service.component.html',
  styleUrls: ['./test-service.component.css']
})
export class TestServiceComponent implements OnInit {

constructor(testService: TestService){
   testService.getAllTest();
}
}

Hope this make your all doubts clear and you can comment if require any discussion.

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Aman Jain
Aman Jain

With years of hands-on experience in the realm of web and mobile development, they have honed their skills in various technologies, including Laravel, PHP CodeIgniter, mobile app development, web app development, Flutter, React, JavaScript, Angular, Devops and so much more. Their proficiency extends to building robust REST APIs, AWS Code scaling, and optimization, ensuring that your applications run seamlessly on the cloud.

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