accéder à un objet JS
// Access an object's properties
const person1 = {};
person1['firstname'] = 'Mario';
person1['lastname'] = 'Rossi';
console.log(person1.firstname);
// expected output: "Mario"
const person2 = {
firstname: 'John',
lastname: 'Doe'
};
console.log(person2['lastname']);
// expected output: "Doe"
Anthony Smith