New Twiddle

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  concatenatedProperties: ['foo', 'bar'],

  init() {
    this._super();
    this.foo = [1,2,3];
    this.bar = [5,6,7];
  },
});

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}}
{{my-component foo=4 bar = 8}}
<br>
<br>

templates.components.my-component.hbs

{{yield}}
{{foo}}
{{bar}}

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"
  }
}