New Twiddle

application.controller.js

import Ember from 'ember';
var Light = Ember.Object.extend({
  isOn: false,
  color: 'yellow',
  age: null,
  description: Ember.computed('isOn','color',function() {
    return 'The ' + this.get('color') + ' light is ' + (this.get('isOn') ? 'on' : 'off');
  }),
//  fullDescription: Ember.computed('description','age',function() {
//    return this.get('description') + ' and the age is ' + //this.get('age')
//  }),
//  desc: Ember.computed.alias('description'),
//  isOnChanged: Ember.observer('isOn','color',function() {
//  })
});

Light.reopen({
  	checkIsOn: Ember.observer('isOn','color', function() {
      Ember.run.once(this,'checkChanged');
    }),
    checkChanged: Ember.observer('description',function() {
      console.log(this.get('description'));
    })
});

var bulb1 = Light.create({age: 22});
bulb1.set('isOn', true);
bulb1.set('color', 'blue');
export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  bulb: Light.create({age: 19}),
  actions:{
    buttonPressed: function() {
      this.get('bulb').toggleProperty('isOn');
      this.get('bulb').set('color','red');
    }
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{bulb.description}}
<br>
{{bulb.fullDescription}}
<br>
<button {{action 'buttonPressed'}}>button</button>
<br>
<br>

twiddle.json

{
  "version": "0.4.10",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.11/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember-template-compiler.js"
  }
}