Sample for GH#11870

controllers.application.js

import Ember from 'ember';

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

helpers.display-name.js

import Ember from 'ember';

export default Ember.Helper.helper(function([ first, last ]) {
  return `${last}, ${first}`;
});

templates.application.hbs

{{display-name 'Robert' 'Jackson'}} 

twiddle.json

{
  "version": "0.4.6",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.5/ember.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.5/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.5/ember-template-compiler.js"
  }
}