New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  onStreetAddressChange: function() {
    var address = this.get('streetAddress2');
    address = (address) ? this.get('streetAddress') + ', ' + address : this.get('streetAddress');
    this.set('address', address);
	}.observes('streetAddress', 'streetAddress2'),
  streetAddress: null,
  streetAddress2: null,
  address: '1119 Union, Apt 2'
});

templates.application.hbs

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

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": "1.12.2",
    "ember-data": "2.5.2",
    "ember-template-compiler": "1.12.2"
  }
}