Basic object oriented programming in JS

const Employee = function(firstName,lastName,age){
  this.firstName = firstName;
  this.lastName = lastName;
  this.age = age;
};

Employee.prototype.getFullName= function(){
  console.log(this.firstName+" "+this.lastName);

};

const person = new Employee("Ayan","Upadhaya",28);

console.log(person.age);
person.getFullName();