npc

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  foo: {
    bar: 0
  },
  
  init() {
    this.get('foo').bar;
    this._super(...arguments); 
  },
  
  actions: {
  
    bar() {
      Object.defineProperty(this.get('foo'), 'bar', {
        get() {
          return this.value;
        },
        set(v) {
          this.value = v;
        }
      });
      this.get('foo').bar = 1;
      Ember.propertyDidChange(this.get('foo'), 'bar');
    }
  
  }
});
 

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{foo.bar}}
<button {{ action 'bar' }}>click</button>
<br> 
<br>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.11.3"
  }
}