New Twiddle

application.controller.js

import Ember from 'ember';

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

application.template.hbs

{{drop-down prop=prop}}
<br>
{{drop-down2 prop=prop}}

drop-down.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  click() {
    this.set('prop', !this.get('prop'))
  }
});

drop-down.template.hbs

Prop: {{prop}}

drop-down2.component.js

import Ember from 'ember';

export default Ember.Component.extend({
});

drop-down2.template.hbs

Prop: {{prop}}

geo.service.js

import Ember from 'ember';

export default Ember.Service.extend({
    
  cities() {
    return new Ember.RSVP.Promise(function(resolve) {
      Ember.run.later(function() {
        resolve(['Paris', "Washington DC", "Bogota", "Nairobi", "Auckland"]);
      }, 3000);
    });
  }
  
});

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.1.0",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "2.1.0"
  }
}