Javascript prototype - object.create issue -


I am trying to learn about object.create and prototype inheritance and the following is: 

  employee = {'attributes': {}, getAttributes: function () {this.attributes return; }, addAttribute: function (attribute) {if (! this.attributes.hasOwnProperty (attribute)) {this.attributes.extend (attribute); }}}; Var OfficeEmployee = Object Create (employee); var OfficeEmployeeInstance = Object Create (OfficeEmployee, {'attributes': {'id': 123, 'name': 'Bob'}}); console.log (OfficeEmployeeInstance.attributes); OfficeEmployeeInstance.addAttribute ({'Salary': '100'}); console.log (OfficeEmployeeInstance.getAttributes ());   
 This works because I hope it should be and throws errors:  
  console.log (OfficeEmployeeInstance.attributes);   
 is undefined  
 and  
  console.log (OfficeEmployeeInstance.getAttributes ());   
 returns the error:  
  Uncort type error: The method of undefined tester.js can not call 'hasOwnProperty': 39 Staff: addAttribute tester.js : 39 (anonymous function)   
 What am I doing wrong here?  
 
 
 
 The second argument of  Object.create  should be a property object. It is an object with a defined structure and specific properties:  
  var OfficeEmployeeInstance = Object.create (OfficeEmployee, {'attributes': {value: {'id': 123, 'name' : 'Bob'}, writeable: true, countable: true}});   
 You can get the supported properties.

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