New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  data: Ember.computed(function() {
    return [
      { id: 1 },
      { id: 2, isSelected: true },
      { id: 3 }
      ];
  }),
  actions: {
    onDone() {
      alert(this.get('data').filterBy('isSelected').mapBy('id'));
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#each data as |item|}}
	<label>
    <input type="checkbox" checked={{item.isSelected}} onchange={{action (mut item.isSelected) value='target.checked'}}>
    {{item.id}}
  </label>
{{/each}}
<br>
<br>
<button {{action 'onDone'}}>Done!</button>

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": {}
}