New Twiddle

controllers.application.js

import Ember from 'ember';

function func1() {
  alert('func1');
}
function func2() {
  alert('func2');
}

export default Ember.Controller.extend({
  onInit1: Ember.on('init', func1),
  onObserve1: Ember.observer('asdf', func1),
  onObserve2: Ember.observer('asdf', func2)
});

templates.application.hbs

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

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}