What are the best practices for deep copying objects in JavaScript?

What are the best practices for deep copying objects in JavaScript?

Deep copying in JavaScript can be tricky. The best practices include using methods like JSON.parse(JSON.stringify(obj)), or libraries like Lodash's _.cloneDeep().

Are there any performance considerations I should be aware of?

Yes, using JSON.stringify can be slower for large objects and won't copy functions or special object types like Dates. Consider using a library for complex structures.

Can you explain the difference between shallow copy and deep copy?

Sure! A shallow copy duplicates the top-level properties, while a deep copy duplicates all nested properties, creating a completely independent object.

What are some common pitfalls when deep copying?

Common pitfalls include losing methods, not copying prototype properties, and issues with circular references. Always test your deep copy method!