Ember.defineProperty

controllers.application.js

import Ember from 'ember';

const WEEK_DAY_NAMES = [
  'Sunday', 'Monday',
  'Tuesday', 'Wednesday',
  'Thursday', 'Friday',
  'Saturday'
];
export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  init() {
    this._super(arguments);
    WEEK_DAY_NAMES.forEach(day => {
      Ember.defineProperty(
        this,
        `${day}-defineProperty`,
        Ember.computed(function() {
          return `${day} defined value`;
        }));
    });
  },
  ...(WEEK_DAY_NAMES.reduce((acc, day) => {
    acc[day] = Ember.computed(function() {
      return `${day} other value`;
    });
    return acc;
  }, {}))
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>
<ul>
<li>{{ Monday }}</li>
<li>{{ Monday-defineProperty }}</li>
<li>{{ Tuesday }}</li>
<li>{{ Wednesday }}</li>
<li>{{ Thursday }}</li>
<li>{{ Friday }}</li>
<li>{{ Saturday-defineProperty }}</li>
</ul>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}