New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  arr1: ['2','1'],
  arr2: ['1','2'],
  
  actions: {
    arraysEqual: function() {
      var arr1 = this.get('arr1').slice().sort();
      var arr2 = this.get('arr2').slice().sort();
      var originalArr1 = 'Arr1 = ' + this.get('arr1').join(',') + '\n';
      var originalArr2 = 'Arr2 = ' + this.get('arr2').join(',') + '\n';
      
      alert(
        originalArr1 += originalArr2 += Ember.compare(arr1, arr2) === 0 ?
        	'Equal' :
        	'Not Equal'
      );
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<button {{action "arraysEqual"}}>compare</button>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.8.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}