inherited computed property

application.controller.js

import Ember from 'ember';
import CoreController from '../core/controller';

const { computed } = Ember;

export default CoreController.extend({
  queryParams: ['appName', 'foobar'],
  appName: 'Ember Twiddle',
  foobar: 'baz',
  something: computed('{appName,foobar}', {
    get() {
      return this._super(...arguments) + ` & new value (${this.get('foobar')})`;
    }
  })
});

application.template.hbs

<h1>Welcome to {{appName}} ({{foobar}})</h1>
<br>
<br>
{{something}}
<br>
<br>

core.controller.js

import Ember from 'ember';

const { computed } = Ember;

export default Ember.Controller.extend({
  something: computed('appName', {
    get() {
      return `core value (${this.get('appName')})`;
    }
  })
});

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"
  }
}