New Twiddle

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

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

<input type="radio" value="negative" checked={{eq selected "negative"}} onchange={{action (mut selected) value="target.value"}}>
Negative
<br>
<input type="radio" value="zero" checked={{eq selected "zero"}} onchange={{action (mut selected) value="target.value"}}>
Zero
<br>
<input type="radio" value="positive" checked={{eq selected "positive"}} onchange={{action (mut selected) value="target.value"}}>
Positive
<br>
<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": "2.12.1",
    "ember-truth-helpers": "1.3.0"
  }
}