outside world access

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  
  myService: Ember.inject.service(),
  
  list: Ember.computed.alias('myService.list'),
  
  sortProperty: ['name'],
  sortedList: Ember.computed.sort('list', 'sortProperty')
  
});

services.my-service.js

import Ember from 'ember';

export default Ember.Service.extend({
  
  list: Ember.A(),
  
  addItem: function(item) {
    let newItem = Ember.Object.create(item);
    let list = this.get('list');
    list.pushObject(newItem);
  },
  
  _populate: Ember.on('init', function() {
    this.addItem({name: 'z'});
    this.addItem({name: 'y'});
    this.addItem({name: 'a'});
    // How do I do the same from the console?
    // ???.__container__.lookup('service:my-service').addItem({name: 'b'})
  })
  
});

templates.application.hbs

{{#each sortedList as |item|}}
  {{item.name}}
  <br>
{{/each}}

{{outlet}}

twiddle.json

{
  "version": "0.7.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.2.2",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "2.2.2"
  }
}