What are the advantages of using the spread operator with arrays and objects?

The spread operator (...) in JavaScript allows you to easily copy arrays and objects, merge them, and add new elements or properties. It simplifies syntax and improves readability. For arrays, it can be used to concatenate or clone arrays. For objects, it can be used to merge objects or add new properties.

// 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 }