New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  exampleA: Ember.Object.create({
    a: 1,
    b: 2,
    c: 3,
  }),
  displayA: Ember.computed('exampleA', function() {
    let bits = this.getProperties('exampleA.{a,b,c}');
    return JSON.stringify(bits, null, 2);
  }),
  displayB: Ember.computed('exampleA', function() {
    let bits = this.get('exampleA').getProperties('{a,b,c}');
    return JSON.stringify(bits, null, 2);
  }),
  displayC: Ember.computed('exampleA', function() {
    let bits = this.get('exampleA').getProperties('a', 'b', 'c');
    return JSON.stringify(bits, null, 2);
  }),
});

templates.application.hbs

<br>
<pre>{{displayA}}</pre>
<br>
<pre>{{displayB}}</pre>
<br>
<pre>{{displayC}}</pre>

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"
  }
}