New Twiddle

components.my-component.js

import Ember from 'ember';

function foo() {
  alert(this);
}

export default Ember.Component.extend({
  data: 42,
  normalFunction() {
    alert(this.get('data'));
    foo();
  },
  actions: {
    normalAction() {
      alert(this.get('data'));
      foo();
    }
  },
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

{{my-component}}

templates.components.my-component.hbs

<button {{action (action normalFunction)}}>
	Click the function
</button>

<button {{action 'normalAction'}}>
	Click the action
</button>

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.8.0",
    "ember-data": "2.8.0",
    "ember-template-compiler": "2.8.0",
    "ember-testing": "2.8.0"
  },
  "addons": {}
}