New Twiddle

controllers.application.js

import Ember from 'ember';
import { computed } from '@ember/object';

const Foo = Ember.Object.extend({
  bar: computed(function() {
    console.log(`bar ${this.id} called`);
    return `${this.id} > bar`;
  }),
});

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  bob: computed(function() {
    let foos = [
  		Foo.create({ id: 1 }),
      Foo.create({ id: 2, bar: 'blah' }),
      Foo.create({ id: 3 }),
	  ];
    
    foos.forEach((foo) => {
      console.log(foo.id, typeof foo.bar);
    });
    
    return foos;
  }),
});

templates.application.hbs

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

<ul>
{{#each bob as |b|}}
  <li>{{b.bar}}</li>
{{/each}}
</ul>

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"
  }
}