Object pathing

controllers.application\.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  testObject: Ember.computed(() => ({
    myArray: [
      {
        arrayProp: 'Hello!'
      }
    ]
  })),
  testValue: Ember.computed('testObject', function() {
    return Ember.get(this, 'testObject.myArray.0.arrayProp')
  }),
});

templates.application\.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<p>testValue using get: {{testValue}}</p>
<p>testValue using template: {{testObject.myArray.0.arrayProp}}</p>

{{outlet}}
<br>
<br>

twiddle\.json

{
  "version": "0.16.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.14.3",
    "ember-template-compiler": "3.14.3",
    "ember-testing": "3.14.3"
  },
  "addons": {
    "ember-data": "3.14.1"
  }
}