const name = "Jean";
const age = 30;

// SANS shorthand
const user = {
    name: name,
    age: age
};

// AVEC shorthand
const user = { name, age };
// { name: "Jean", age: 30 }

// Mélange
const user = {
    name,
    age,
    city: "Paris" // pas de shorthand ici
};