New Twiddle

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

{{#father-component as |f|}}
  {{#f.left-content}} 
    This is a content
  {{/f.left-content}}
  {{#f.right-content}}
    This is a another content
  {{/f.right-content}}
{{/father-component}}

templates.components.father-component.hbs

<div class="left">
  {{yield (hash left-content = (component "foo-content"))}}
</div>
<div class="right">
  {{yield (hash right-content = (component "foo-content"))}}
</div>

templates.components.foo-content.hbs

{{yield}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}