New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  isOn: false,
  
  actions: {
    toggle: function() {
      this.toggleProperty('isOn');
    },
    alert() {
      alert("HERE");
    }
  }
});

templates.application.hbs

<h1 {{action "toggle"}}>Welcome to {{appName}}</h1>
{{#if isOn}}
<div><button {{action "toggle"}}>Toggle</button></div>
{{else}}
<div><button {{action "alert"}}>Alert</button></div>
{{/if}}
<br>
<br>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.8.0",
    "ember-data": "2.8.0",
    "ember-template-compiler": "2.8.0",
    "ember-testing": "2.8.0"
  },
  "addons": {}
}