New Twiddle

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  // init () {
  //   this.set('model', { numbers: [ 1 ] });
  // 	this._super(...arguments);
  // },
  model: Object.freeze({numbers:[ 1 ]}),
  actions: {
   pushOne () {
   	 const model = this.get('model.numbers');
     const next = model[model.length-1];
     model.pushObject(next+1);
   } 
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{my-component}}
<hr>
{{my-component}}
<br>
{{outlet}}
<br>
<br>

templates.components.my-component.hbs

{{#each model.numbers as |item|}}
	{{item}}
{{/each}}
<button type="button" {{action 'pushOne'}}>push one</button>

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"
  }
}