New Twiddle

application.controller.js

import Ember from 'ember';

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

application.template.hbs

{{my-component}}

my-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  objectProperty: {},
  currentTime: Ember.computed('objectProperty', function() {
    const prop = this.get('objectProperty');
    const numKeys = Object.keys(prop).length;
    console.log(`Property has ${numKeys} key(s).`);
  	if (numKeys) {
    	return 'hi'
    }
    else {
    	return 'Property is empty';
    }
  }),
  actions: {
  	doSomething() {
      const d = new Date();
    	const t = d / 1000;
      this.set(`objectProperty.key`, d.toString());
      console.log(this.get('objectProperty'));
    }
  }
});

my-component.template.hbs

<h3>{{currentTime}}</h3>
<button {{action 'doSomething'}}>Set key to current time</button>

twiddle.json

{
  "version": "0.5.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}