New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  runAction1: true,
  
  actions: {
    action1: function() {
      this.set('appName', 'action1 was run');
    },
    action2: function() {
      this.set('appName', 'action2 was run');
    }
  }
});

templates.application.hbs

<h1>Dynamic action name</h1>

<h2>{{appName}}</h2>
<br>
<br>
runAction1: 

{{input type='checkbox' checked=runAction1}}

<button {{action (if runAction1 'action1' 'action2')}}>Click Me</button>

twiddle.json

{
  "version": "0.7.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.3/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/2.4.3/ember-template-compiler.js"
  }
}