ember-get-has-own-property

controllers.application.js

import Ember from 'ember';

class Counter {}
Counter.prototype.value = 0;

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',

  counter: Ember.computed(function() {
    return new Counter();
  }),

  counterValue: Ember.computed.alias('counter.value')
});

helpers.has-own-property.js

import Ember from 'ember';

export function hasOwnProperty(params/*, hash*/) {
  const [ object, property ] = params;

  return Object.prototype.hasOwnProperty.call(object, property);
}

export default Ember.Helper.helper(hasOwnProperty);

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{outlet}}
counter.hasOwnProperty('value') => {{has-own-property counter 'value'}}
<br>
counter.value => {{counter.value}}
<br>
counter.hasOwnProperty('value') => {{has-own-property counter 'value'}}
<br>
counterValue => {{counterValue}}
<br>
counter.hasOwnProperty('value') => {{has-own-property counter 'value'}}

twiddle.json

{
  "version": "0.13.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}