Anil Singh | Code-sample.com

In Angular, two ways to make a singleton service - 1.       Include the service in the AppModule 2.       Declare that the service should be provided in the application root. The preferred way to create a singleton service - Form beginning to Angular 6 is – import { Injectable } from '@angular/core' ; @ Injectable ({   providedIn: 'root' , }) export class CustomerService { } Another way to create a singleton service - Include service in the AppModule customer.service.ts – import { Injectable } from '@angular/core' ; @ Injectable () export class CustomersService {   constructor () { } } And app.module.ts - import { CustomerService } from './customers.service' ; //AppModule class with @NgModule decorator @ NgModule ({   //Static, this is the compiler configuration   //declarations is used for configure the selectors.   declarations: [ ...

What is an Angular 2 Service? Angular 2 service is a class that encapsulates some methods (GET/POST/PUT) and provides it result as a service for across your application. What are the features of Angular 2 Service? The Angular 2 is using services concept and it provide the multiple features to us that are, 1.       Services are singleton objects. 2.       Services are capable of returning the data in the form promises or observables. 3.       Service class is decorated with Injectable decorator. 4.       The Injectable decorator is required only if our service class is making use of some Angular injectable like Http, Response and HttpModule service within it. Stayed Informed – Angular 2 Tutorials and Examples Steps for creating an Angular 2 Service:- There are four steps as, 1.       Import the injectable member i.e. import {Injecta...