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