Cú pháp spread trong mảng

const arr1 = [1, 2, 3];
const arr2 = [4, 5, 6];
const combined = [...arr1, ...arr2];
console.log(combined); // [1, 2, 3, 4, 5, 6]

const original = [1, 2, 3];
const copy = [...original];
console.log(copy); // [1, 2, 3]

const numbers = [1, 2, 3];
const moreNumbers = [0, ...numbers, 4];
console.log(moreNumbers); // [0, 1, 2, 3, 4]

function sum(a, b, c) {
  return a + b + c;
}
const numbers = [1, 2, 3];
console.log(sum(...numbers)); // 6