Javascript Object Inheritance

function Person(firstName, lastName) {
    this.firstName = firstName;/*from ww w .ja  va 2s .com*/
    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 = new Person();
Employee.prototype.getFullName = function() {
    let fullName = Person.prototype.getFullName.call(this);

    return fullName + ", " + this.position;
};

let employee = new Employee("CSS", "HTML", "Author");

console.log(employee.getFullName());