Example keys

components.my-component.js

import Ember from 'ember';

const meow = undefined;
const lol = 'lol';

export default Ember.Component.extend({
  foo: {
    lol,
    meow
  },
  
  bar: Ember.computed('foo', function() {
		return Object.keys(this.get('foo'));
  }),
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

{{my-component}}

templates.components.my-component.hbs

<h1>My Component</h1>
{{foo.lol}}
{{foo.meow}}
{{bar}}

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}