New Twiddle

application.route.js

import Ember from 'ember';

export default Ember.Route.extend({
actions: {

  apple() {
    alert('action is available');
  },
  
  checkActionAvailable: function(actionName) {
  console.log(this);
    if(Em.get(this.actions,actionName)) {
              this.send(actionName);
        } 
  },
  
}
});

application.template.hbs

<h2> Why are actions not available in this.actions ? </h2>
<br>
<br>

<button {{action 'checkActionAvailable' 'apple'}}> click here</button>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.4.17",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "1.13.11",
    "ember-data": "1.13.15",
    "ember-template-compiler": "1.13.11"
  }
}