The spread operator (...) is used to expand elements of an array or object. It can be used to create shallow copies or merge multiple arrays or objects.
Example with arrays:
const arr1 = [1, 2, 3];
const arr2 = [...arr1, 4, 5];
console.log(arr2); // [1, 2, 3, 4, 5]Example with objects:
const obj1 = { name: 'John', age: 30 };
const obj2 = { ...obj1, city: 'New York' };
console.log(obj2); // { name: 'John', age: 30, city: 'New York' }Tags: basic, JavaScript, operators