class Person { 
    constructor(firstname, lastname) { 
    this.firstname = firstname; 
    this.lastname = lastname;
    } 
    fullname(){
        return this.firstname + " " + this.lastname;
    }
} 
let person1 = new Person("Maaike", "van Putten");
let person2 = new Person("Laurence", "Svekis");
console.log(person1.fullname());
console.log(person2.fullname());