JS-ES6 Factory Method Example

var delegationObjects = {
  Employee: (name) => Object.assign({
    name,
    hello: () => console.log(`Hi, I'm ${name}`)
  }),
  
  Fulltime: (name, role) => Object.assign(delegationObjects.Employee(name), {
    role,
    weeklyHours: 40
  }),
  
  Parttime: (name, role) => Object.assign(delegationObjects.Employee(name), {
    role, 
    weeklyHours: 20
  }),
  
  Manager: (name, role) => Object.assign(delegationObjects.Fulltime(name, role), {
    hourly: 30
  }),
  
  Salesman: (name, role) => Object.assign(delegationObjects.Fulltime(name, role), {
    hourly: 20
  }),
  
  Temporary: (name, role) => Object.assign(delegationObjects.Parttime(name, role), {
    hourly: 14,
    weeklyHours: 30
  })
};

var employeeDelegationFactory = function(name, role) {
  if(role === 'manager') return delegationObjects.Manager(name, role);
  else if(role === 'salesman') return delegationObjects.Salesman(name, role);
  else if(role === 'temporary') return delegationObjects.Temporary(name, role);
};

var generateOffice = function() {
  var cast = [];
  cast.push(employeeDelegationFactory('michael', 'manager'));
  cast.push(employeeDelegationFactory('jim', 'salesman'));
  cast.push(employeeDelegationFactory('ryan', 'temporary'));
  return cast;
};
var officeCast = generateOffice();
officeCast;

// adapted from https://medium.com/javascript-scene/3-different-kinds-of-prototypal-inheritance-es6-edition-32d777fa16c9