Anil Singh | Code-sample.com

The basics Steps of Dependency injection, 1.      A class with @Injectable () to tell Angular2 that it’s to be injected “UserService”. 2.      A class with a constructor that accepts a type to be injected. Stayed Informed-  @Injectable() vs. @Inject()?  Example , UserService marked as @Injectable as, import { Injectable, InjectionToken } from '@angular/core' ; import { Http, Response } from '@angular/http' ; import 'rxjs/add/operator/map' ; //BEGIN-REGION - USERSERVICE @ Injectable() export class UserService { constructor ( private _http: Http ) { } getAPIUsers(apiUrl) { return this ._http.get(apiUrl).map((data: Response ) => data.json()); } getAppUsers(apiUrl) { return this ._http.get(apiUrl).map((data: Response ) => data); } } //END BEGIN - USERSERVICE Angular2 - Related Concepts When use @Inject()? When Use @Injectabl...