The most efficient way to deep clone an object in JavaScript

Hi everyone! I'm new to JavaScript and ran into a problem when copying objects. I need to create an independent copy of an object so that changes to the copy don't affect the original. Here's an example of code that doesn't work for me: ```javascript const original = { name: 'Anna', age: 25, address: { city: 'Moscow', street: 'Lenina' }, hobbies: ['reading', 'sport'] }; const copy = original; copy.name = 'Maria'; copy.address.city = 'SPb'; console.log(original.name); // 'Maria' — changed! console.log(original.address.city); // 'SPb' — also changed! ``` I tried using `Object.assign()` and the spread operator: ```javascript const copy2 = Object.assign({}, original); const copy3 = {...original}; copy2.address.city = 'Kazan'; console.