New Twiddle

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
init() {
this._super(...arguments);
Ember.run.scheduleOnce('sync', this,() =>{
this.set('content', [1,2]);
});

}
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
	model: [1,2,3]
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
controller --- 
{{model.length}}
<hr>
{{my-component content=model}}
{{outlet}}
<br>
<br>

templates.components.my-component.hbs

component --- {{content.length}}
{{yield}}

twiddle.json

{
  "version": "0.7.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "release",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "release"
  }
}