fe1a898c2606-06.js

fucntion Person(name, dob) {
  this.name = name;
  this.dob = dob;
}

const sherlock = new Person({
  name: 'Sherlock Holmes',
  dob: '01-06-1852';
});

let john = new Person({
  name: 'Dr John Dollar',
  dob: '01-08-1866'
});

const dick = new Person({
  name: 'Dick Donovan',
  dob: '01-01-1875'
});

// set john to undefined
john = undefined;