Constructor OO pattern in JavaScript

constructor_function.js

/** Person pseudo class. */
const Person = (function () {
  function Person(firstName, lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
  }

  Person.prototype.alias = function () {
    return this.firstName.charAt(0) + this.lastName.charAt(0);
  }

  Person.prototype.fullName = function () {
    return this.firstName + ' ' + this.lastName;
  }

  return Person;
})();

const p = new Person('Lorem', 'Ipsum');
console.log(p.fullName());  // Lorem Ipsum

/** Professional pseudo class. */
const Professional = (function () {
  function Professional(honorific, firstName, lastName) {
    Person.call(this, firstName, lastName);
    this.honorific = honorific;
  }

  /** Prototype chain. */
  Professional.prototype = Object.create(Person.prototype);

  Professional.prototype.professionalName = function () {
    return this.honorific + ' ' + this.firstName + ' ' + this.lastName;
  }

  return Professional;
})();

const prof = new Professional('Mr.', 'Lorem', 'Ipsum');
console.log(prof.fullName());         // Lorem Ipsum
console.log(prof.professionalName()); // Mr. Lorem Ipsum