New Twiddle

controllers.application.js

import Ember from 'ember';

let guid = () => (Math.random().toString(36) + '00000000000000000').slice(2, 14)

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  vol: Ember.computed(function() {
    return guid();
  }).volatile(),
  actions: {
    recomputeFoo() {
      this.set('values', [
        this.get('vol'),
        this.get('vol'),
        this.get('vol'),
        this.get('vol'),
        this.get('vol'),
        this.get('vol'),
        this.get('vol'),
        this.get('vol'),
        this.get('vol'),
        this.get('vol'),
        this.get('vol'),
        this.get('vol'),
        this.get('vol'),
      ]);
    }
  }
});

templates.application.hbs

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

<button {{action 'recomputeFoo'}}>
  Recompute
</button>

{{#each values as |v|}}
<p>{{v}}</p>
{{/each}}

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"
  }
}