New Twiddle

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  init() {
    const message = 'Test message.';
    const options = { id: 'test', until: '3.0.0' };
    
    // passing IIFE (1)
  	Ember.deprecate(message, (function() {
    	return true;
    })(), options);
    
    const myConstructor = {}.constructor;
    
    // passing !!constructor (2)
    Ember.warn(message, !!myConstructor, options);
    
    // passing boolean directly (3)
    Ember.assert(message, true, options);
    
    this._super();
  }
});

application.template.hbs

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

twiddle.json

{
  "version": "0.4.11",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.11/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember-template-compiler.js"
  }
}