light observers

app.js

import Ember from 'ember';
//import Resolver from 'ember/resolver';
//import loadInitializers from 'ember/load-initializers';
import config from './config/environment';
import Light from './Light';

var App;

Ember.MODEL_FACTORY_INJECTIONS = true;

App = Ember.Application.extend({
  modulePrefix: config.modulePrefix,
  podModulePrefix: config.podModulePrefix,
 // Resolver: Resolver
});

//loadInitializers(App, config.modulePrefix);

const bulb = Light.create({age: 22, color: 'yellow'}); 
//console.log(bulb.get('description')); //The yellow light is set to false 
console.log('about to set isOn true');
bulb.set('isOn', true);
console.log('about to set isOn false');
bulb.set('isOn', false);
bulb.set('color', 'yellow');

//console.log(bulb.get('description')); //The yellow light is set to true
//console.log(bulb.get('age'));
//bulb.set('isOn', false);
//console.log(bulb.get('fullDescription')); //The yellow light is set to true and the age is 32
//console.log(bulb.get('pusdoDescription')); //The yellow light is set to true and the age is 32.

export default App;

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'more Ember Twiddle'
  

});

Light.js

import Ember from 'ember';
export default Ember.Object.extend( {
   isOn: false,
   color: 'yellow',
   age: null,
   
   description: Ember.computed('isOn', function() {
     return'The bulb is '+ this.get('color') + ' and the light is set to ' + this.get('isOn');
   }),
   
   fullDescription: Ember.computed('description','age', function() {
     return this.get('description') + ' and the age is ' +
       this.get('age');
   }),
   isOnChanged: Ember.observer('isOn', function() {
     console.log('isOn value changed to ' + this.get('isOn'));
   }),
  didAnythingChange: Ember.observer('isOn', 'color', function() {
    console.log('either isOn or color changed value');
  }),
  checkIsOn: Ember.observer('isOn', function() {
    Ember.run.once(this,'checkChanged');
  }),
  checkChanged: Ember.observer('description', function() {
    console.log(this.get('description'));
  }),
  
  pusdoDescription: Ember.computed.alias('fullDescription')
  
});
   

templates.application.hbs

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

{{bulb}}
{{outlet}}
<br>
<br>

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": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember-template-compiler.js"
  }
}