DDAU example

components.styled-button.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: 'button',
  action: null,
  
  click() {
    this.get('action')();
  }
});

components.the-toggler.js

import Ember from 'ember';

export default Ember.Component.extend({
  isOn: false,
  
  actions: {
    switchToggleState() {
      this.set('isOn', !this.get('isOn'));
    }
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{the-toggler}}
<br>
<br>

templates.components.styled-button.hbs

{{yield}}

templates.components.the-toggler.hbs

{{#if isOn}}
  The Toggle is On
{{else}}
  The Toggle is Off
{{/if}}

{{#styled-button action=(action 'switchToggleState')}}
Switch it
{{/styled-button}}

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": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember-template-compiler.js"
  }
}