How to run a service when the app starts in Angular 2

Question

I created a service SocketService, basically it initializes the socket to let the app listen on the port. This service also interacts with some components.

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Answer 1

Move the logic in your SocketService constructor to a method instead and then call that in your main component's constructor or ngOnInit

SocketService

export class SocketService{
    init(){
        // Startup logic here
    }
}

App

import {SocketService} from './socket.service';
...
class App {
    constructor (private _socketService: SocketService) {
        _socketService.init();
    }
}
bootstrap(App, [SocketService]);