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<!DOCTYPE html> <html> <body> <h1>Variables JavaScript</h1> <h2>Échange de Variables</h2> <p id="demo"></p> <script> let firstName = "John"; let lastName = "Doe"; // Destructuration [firstName, lastName] = [lastName, firstName]; // Afficher les valeurs document.getElementById("demo").innerHTML = firstName + " " + lastName; </script> </body> </html>