New Twiddle

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
show: true,
	computedWithoutKey: Em.computed(function() {
		return this.get('show');
  }),
	computedWithKey: Em.computed('show', function() {
		return this.get('show');
  }),
actions: {
	toggle() {
		this.toggleProperty('show');
}
}
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
controllerProp: {{show}}
<br>
<br>
computedWithoutKey: {{computedWithoutKey}}
<br>
<br>
computedWithKey: {{computedWithKey}}
{{outlet}}

<br>
<br>
<button {{action 'toggle'}}>toggle</button>

twiddle.json

{
  "version": "0.5.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "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/2.2.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}