Ember.get

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  prop: Ember.computed(function() {
    return Ember.get('aasdasd', '');
  }),
  prop2: Ember.computed(function() {
    return Ember.A(['item 1', 'item 2', 'item 3']).findBy('', 'item 1');
  })
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{if prop prop '!falsy!'}}
<br>
{{if prop2 prop2 '!falsy!'}}
<br>

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "beta",
    "ember-data": "2.8.0",
    "ember-template-compiler": "beta",
    "ember-testing": "beta"
  },
  "addons": {}
}