JSFiddle - React, Tailwind, and code Playground

JavaScript

function Person(firstName, lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
}

Person.prototype.getFullName = function() {
    return this.firstName + " " + this.lastName;
};

function Employee(firstName, lastName, position) {
    Person.call(this, firstName, lastName);
    this.position = position;
}

Employee.prototype = Object.create(Person.prototype);

Employee.prototype.getEmployeeInfo = function() {
  return this.getFullName() + ", " + this.position;
};

var employee = new Employee("John", "Doe", "Manager");

var info = employee.getEmployeeInfo();

alert(info);