New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  arr: [1, 2, 3],
  
  actions: {
  	sort() {
      this.set('arr', this.get('arr').sort());
      console.log('sort', this.arr);
    },
    
    reverse() {
      this.set('arr', this.get('arr').reverseObjects());
			console.log('reverse', this.arr);
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

{{arr}}

<button {{action "sort"}}>Sort</button>
<button {{action "reverse"}}>Reverse</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": {
    "ember-data": "3.4.2"
  }
}