What methods exist for creating a deep copy of an object?

There are several approaches to creating a deep copy of an object in JavaScript:

1. JSON.parse(JSON.stringify(obj)) — the simplest method, but it does not copy functions, symbols, properties with undefined, and does not work with objects containing cyclic references.

const deepCopy = JSON.parse(JSON.stringify(originalObject));

2. Recursive copying — write a function that recursively copies all nested objects and arrays, considering data types.

3. Using libraries — for example, lodash with the _.cloneDeep() function:

const _ = require('lodash');
const deepCopy = _.cloneDeep(originalObject);

4. Structured Clone API — a modern method supported in browsers and Node.js, which correctly copies most types, including cyclic references:

const deepCopy = structuredClone(originalObject);

The choice of method depends on data type requirements and environment.