Array shared between components

application.controller.js

import Ember from 'ember';

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

application.template.hbs

<h1>Welcome to {{appName}}</h1>
{{my-component createNewArray=true}}<br/>
{{my-component}}<br/>
{{my-component}}<br/>
{{my-component}}<br/>

my-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  array: Ember.A(),
  createNewArray: false,
  init: function() {
    this._super(...arguments);
    if(this.get('createNewArray')) {
      this.set('array', Ember.A());
    }
    var array = this.get('array');
    for(var i = 0; i < 2; i++) {
      array.pushObject('item' + i);
    }
  }
});

my-component.template.hbs

Component: {{elementId}}<br/>
{{#each array as |item|}}
  {{item}}<br/>
{{/each}}

twiddle.json

{
  "version": "0.4.10",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.11/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember-template-compiler.js"
  }
}