New Twiddle

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  greeting: 'Hello',
  
  actions: {
    showAlert(message) {
      const greeting = this.get('greeting');
      
      alert(`${greeting}, ${message}!`);
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  message: 'world',

  actions: {
    callAction(action) {
      const message = this.get('message');
      
      action(message);
    }
  }
});

templates.application.hbs

{{#my-component as |c|}}
  <button onclick={{action 'callAction' c.showAlert}}>Click me</button>
{{/my-component}}

templates.components.my-component.hbs

{{yield (hash showAlert=(action 'showAlert'))}}

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"
  }
}