How do different object methods perform in JavaScript?

What are the performance differences between using Object.keys() and for...in loop?

Object.keys() creates an array of the object's own enumerable property names, while for...in iterates over all enumerable properties, including inherited ones. Generally, Object.keys() is faster for large objects.

Are there any performance considerations when using Object.assign()?

Yes, Object.assign() can be slower than other methods like the spread operator, especially with large objects, due to its copying behavior.

How does the performance of Object.entries() compare to Object.values()?

Both methods have similar performance, but Object.entries() returns key-value pairs, which can be more useful in certain scenarios.

What about the performance of using the spread operator for objects?

The spread operator is generally efficient for shallow copies, but for deep copies, it may not perform as well as other methods.