New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

controllers.index.js

import Ember from 'ember';

export default Ember.Controller.extend({
  foo: Ember.computed('bar', {
    get () {
      return 'Foo';
    },
    set (key, value) {
    	return value;
    } 
  }),
  bar: 'Bar',
  
  actions: {
    changeBar () {
      this.set('bar', 'Sneh');
    },
    changeFoo () {
      this.set('foo', 'Sneh');
    }
  }
});

templates.application.hbs

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

templates.index.hbs

<div>foo: {{foo}}</div>
<div>bar: {{bar}}</div>
<button {{action "changeBar"}}>Change Bar</button>
<button {{action "changeFoo"}}>Change Foo</button>

twiddle.json

{
  "version": "0.8.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}