container lookup

controllers.application.js

import Ember from 'ember';
import ExampleObject from '../util/example';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  exampleObject:Ember.computed(function() {
    return ExampleObject.create();
  }),
  myProp: Ember.computed.alias('exampleObject.serviceProp')
});

services.test-service.js

import Ember from 'ember';

export default Ember.Service.extend({
  serviceProp: Ember.computed(function() {
    return 'Hello';
  })
});

templates.application.hbs

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

twiddle.json

{
  "version": "0.4.8",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.8/ember.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.9/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.8/ember-template-compiler.js"
  }
}

util.example.js

import Ember from 'ember';

export default Ember.Object.extend({
  testService: Ember.inject.service('test-service'),
  serviceProp: Ember.computed.alias('testService.serviceProp')
});