New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  myService: Ember.inject.service(),
  appName: 'Ember Twiddle'
});

instance-initializers.start-my-service.js

import Ember from 'ember';

export function initialize(app) {
  const { container = app } = app;
  const myService = container.lookup('service:my-service');
  myService.go();
};

export default {
  initialize,
  name: 'start-my-service'
};

services.my-service.js

import Ember from 'ember';

const { Service, set } = Ember;

export default Service.extend({
  foobar: 'foobar',
  go() {
    set(this, 'foobar', 'barfoo');
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

{{myService.foobar}}

twiddle.json

{
  "version": "0.10.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.6.0",
    "ember-data": "2.6.1",
    "ember-template-compiler": "2.6.0"
  },
  "addons": {}
}