New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  totalCosts:Ember.computed('pricing',
    function(){
    var costs = {};
    costs["price"]=5;
    costs["subscription"]=2;
    costs["perRoom"]=2;
    return costs;
  }),
  margins:Ember.computed('totalCosts', function(){
    var totals={};
    totals['costs']=this.get('totalCosts');
    return JSON.stringify(totals);
  }),
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{margins}}
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-data": "3.2.0"
  }
}