Inheritance model implemented in JavaScript, a prototype-based language without classes

JS Employee Class Inheritance

function Employee() {
  this.name = '';
  this.dept = 'general';
}

function Manager() {
  Employee.call(this);
  this.reports = [];
}
Manager.prototype = Object.create(Employee.prototype);

function WorkerBee() {
  Employee.call(this);
  this.projects = [];
}
WorkerBee.prototype = Object.create(Employee.prototype);
    
function SalesPerson() {
  WorkerBee.call(this);
  this.dept = 'sales';
  this.quota = 100;
}
SalesPerson.prototype = Object.create(WorkerBee.prototype);

function Engineer() {
  WorkerBee.call(this);
  this.dept = 'engineering';
  this.machine = '';
}

Engineer.prototype = Object.create(WorkerBee.prototype);

// from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Details_of_the_Object_Model