http://stackoverflow.com/questions/42780103/how-to-get-an-element-from-an-array-using-index-inside-template/42780127#42780127

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  k:['one','two'],
  kk:[{id:'one'},{id:'two'}],
});

templates.application.hbs

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

{{get k (concat 0)}}
{{get kk (concat 0)}}
{{log (get kk (concat 0)) }}

<br>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.11.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.11.0",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.11.0",
    "ember-testing": "2.11.0"
  },
  "addons": {}
}