text: var robPerson = {
      firstName: 'Rob',
      lastName: 'Juall',
      address: {
          street: '111 Main St.',
          city: 'New York',
          state: 'NY',
          zip: 10001
      }
  };
  
  console.log(robPerson);
  
  function greet(person) {
      console.log('Hi ' + person.firstName);
  }
  
  greet(robPerson);
  
  greet({
      firstName: 'Mary',
      lastName: 'Doe'
  });