Spread Operator (...)

Usage: Expand elements of an array or properties of an object.

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

// Objects
const obj1 = { a: 1, b: 2 };
const obj2 = { ...obj1, c: 3 };
console.log(obj2); // { a: 1, b: 2, c: 3 }

Rest Operator (...)

Usage: Collects multiple elements into an array (useful in function parameters and destructuring).

// Function Parameters
const sum = (...numbers) => {
  return numbers.reduce((total, num) => total + num, 0);
};
console.log(sum(1, 2, 3, 4)); // 10

// Destructuring Assignment
const [first, ...rest] = [10, 20, 30, 40];
console.log(first); // 10
console.log(rest);  // [20, 30, 40]