text: //initialize the object
  var Mike = {
      firstname: 'Mike', 
      lastname: 'Raguso',
      address: {
          street: '111 main st.',
          city: 'New York',
          state: 'NY'
      }
  };
  
  function greet(person) {
      console.log('Hi ' + person.firstname);
  }
  
  greet(Mike);
  
  //creating an object on the fly
  greet({
      firstname: 'Mary', 
      lastname: 'Doe'
  });
  
  Mike.address2 = {
      street: '222 Second St.'
  }
  
  Mike.address3 = {
      street: '45 Jumpy Ave.',
      city: 'Old York',
      state: 'Middle-Aged York',
      zip: 91827
  }
  
  
  
  function yourInfo(person) {
      console.log(person.address3.zip);
  }
  
  yourInfo(Mike);