Dynamic computed property creation

controllers.application.js

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

    
export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  init(){
    this._super(...arguments);
    // define a computed property
    let object = {
       foo: 'foo',
       bar: 'bar'
    }
    this.set('myObj', object);
    let keys = Object.keys(object).map((key) => {
      return `myObj.${key}`
    });
    console.log(keys);
    defineProperty(this, 'someComputed', computed.apply(this, [...keys, function() {
      return `${this.myObj.foo} ${this.myObj.bar}`;
    }]));
  },
  actions: {
    changeFoo(){
      this.set('myObj.foo', 'changed foo');  
    },
    changeBar(){
      this.set('myObj.bar', 'changed bar');  
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<label>Dynamically created computed observing all keys of foo</label><br> {{someComputed}}
<br>
<br>

<button {{action 'changeFoo'}}>Change foo</button>
<button {{action 'changeBar'}}>Change bar</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"
  }
}