DDAU example

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  count: 0,
  actions: {
  	incrementCount () {
    	this.incrementProperty('count');
    }
  }
});

templates.application.hbs

<br>
<br>
{{my-component count=count incrementAction=(action 'incrementCount')}}
<br>
<br>

templates.components.my-component.hbs

count: {{count}}
<button type="button" {{action incrementAction}}>Increment count</button>

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": {
  }
}