LexFirstApp

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  name:'Lex',
  what: 'sucks',
  whats: ['is cool', 'is beautiful', 'is an asshole', 'is a supaboy'],
  actions: {
   changeWhat() {
     let whats = this.get('whats');
     let nr = Math.floor(Math.random() * whats.length);
     let next = this.get('whats')[nr];
     this.set('what', next);
   }
  }
});

application.template.hbs

<h1>{{name}} {{what}}</h1>
<button {{action "changeWhat"}}>change</button>

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
  background: purple;
  color: yellow;
  
}
 
button {
  color: yellow; 
    background: purple;
  border: 1px solid ;
  border-radius: 999px;
}

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember-template-compiler.js"
  }
}