New Twiddle

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  foo: 'bar',
  
  init() {
  	this._super(...arguments);
    
    $('body').on('click', () => {
    	console.log(this.get('foo')); // works
    });
    
    $('body').on('click', function() {
      console.log(this.get('foo')); // nope
    });
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{my-component}}
<br>
<br>

templates.components.my-component.hbs

{{yield}}
hi

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}

Example of lexical scoping changes in fat-arrow functions.