computed keys

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  init() {
    this._super(...arguments)
    const app = Ember.Object.create({
      name:
        'starting name'
    });
    this.set('app', app);
  },
  
  nameOne: Ember.computed('app.name', function() {
    return this.get('app.name');
  }),
  
  nameTwo: Ember.computed('app', function() {
    return this.get('app.name');
  }),
  
  actions: {
    toggle() {
      this.set('app.name', 'ending name');
    }
  }
});

templates.application.hbs

<p>
	Key <code>app.name</code>: {{nameOne}}
</p>
<p>
	Key <code>app</code>: {{nameTwo}}
 </p>
<button {{action "toggle"}}>Change value</button>

twiddle.json

{
  "version": "0.11.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.2",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.10.2",
    "ember-testing": "2.10.2"
  },
  "addons": {}
}