What are the best practices for using Object.assign and the spread operator in JavaScript?

What are the best practices for using Object.assign and the spread operator in JavaScript?

Both Object.assign and the spread operator are used for merging objects, but they have different use cases. Object.assign is great for shallow copying properties, while the spread operator is more concise and can be used in array literals as well.

Can you give me an example of how to use both?

Sure! For Object.assign, you can do: const newObj = Object.assign({}, obj1, obj2);. For the spread operator, it looks like this: const newObj = {...obj1, ...obj2};. Both will merge obj1 and obj2 into newObj.

Are there any performance differences between the two?

Yes, the spread operator is generally more performant in modern JavaScript engines, especially for larger objects. However, for small objects, the difference is negligible.

What about handling nested objects?

Both methods perform a shallow copy, so if you have nested objects, you'll need to handle them separately to avoid mutating the original objects.