New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  objects: [{name: "foo"}, {name: "bar"}],
  actions: {
    add() {
      this.get('objects').pushObject({name: "baz"});
    },
    remove() {
      let objects = this.get('objects');
      if(objects.length > 0) {
        objects.removeObject(objects[0]);
      }
    },
    change() {
      let obj = this.get('objects')[0];
      Ember.set(obj, 'name', 'sdfsdfsdf');
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
{{#each objects as |obj|}}
  <h2> {{obj.name}} </h2>
{{/each}}
<button {{action 'add'}}> add </button>
<button {{action 'remove'}}> remove </button>
<button {{action 'change'}}> change </button>
<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": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}