Simple person class

person.js

class Person {
   constructor(firstname, lastname) {
      this._firstname = firstname;
      this._lastname = lastname;      
   }

   set firstname(f) {
      this._firstname = f;
   }

   set lastname(l) {
      this._lastname  = l;
   }

   get firstname() {
       return this._firstname;
   }

   get lastname() {
      return this._lastname;
   }
}