New Twiddle

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  items: Ember.computed('value', function() {
    return [this.get('value')];
  })
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

<p>Type in this box and Ember will throw exceptions:</p>
{{input value=message}}
<br>
{{my-component value=(hash title=message) }}
<br>
<br>

templates.components.inner-component.hbs

{{#each items as |item|}}
  <div>{{item.title}}</div>
{{/each}}

templates.components.my-component.hbs

{{inner-component items=items}}

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.11.1",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.10.2",
    "ember-testing": "2.10.2"
  },
  "addons": {}
}