Angular 2 Injectable - Why @Injectable ()?

Why @Injectable ()?

@Injectable () marks a class as available to an injector for instantiation. An injector reports an error when trying to instantiate a class that is not marked as @Injectable ().

Stayed Informed- @Injectable() vs. @Inject()? 

Injectors are also responsible for instantiating components. At the run-time the injectors can read class metadata in the JavaScript code and use the constructor parameter type information to determine what things to inject.

Example as,

import { Injectable, InjectionToken } from '@angular/core';
import { Http, Response } from '@angular/http';

@Injectable()
export class UserService {
    constructor(private _http: Http) {
    }

    getAPIUsers(apiUrl) {
        return this._http.get(apiUrl).map((data: Response) => data.json());
    }
}

Angular2 - Related Concepts

When use @Inject()?	When Use @Injectable ()?	@Injectable() vs. @Inject() ?
How to use Dependency Injection (DI) correctly in Angular 2?	Dependency Injection (DI) in Angular 2?

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Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link.. My Tech Blog - https://www.code-sample.com/ My Books - Book 1 and Book 2