دمج المصفوفات بإستخدام Spread Syntax

const first = ["HTML", "CSS"];
const second = ["JavaScript", "Python"];
console.log(JSON.stringify([...first, ...second]));

["HTML","CSS","JavaScript","Python"]

const skills = ["HTML", "CSS"];
const updated = [...skills, "JavaScript"];
console.log(JSON.stringify(skills));
console.log(JSON.stringify(updated));

["HTML","CSS"]
["HTML","CSS","JavaScript"]