WhitingHelpers

application.controller.js

import Ember from 'ember';

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

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
Your total is {{format-currency 250}}.
<br>
<br>

helpers.format-currency.js

import Ember from 'ember';

export function formatCurrency(params/*, hash*/) {
  let value = params[0],
      dollars = Math.floor(value / 100),
      cents = value % 100,
      sign = "$";

  if (cents.toString().length === 1) { 
    cents = '0' + cents; 
  }
  return `${sign}${dollars}.${cents}`;
}

export default Ember.Helper.helper(formatCurrency);

twiddle.json

{
  "version": "0.6.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.3.1",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.3.3/ember-data.js",
    "ember-template-compiler": "2.3.1"
  }
}