How can I extend JavaScript objects?

How can I extend JavaScript objects?

You can extend JavaScript objects using Object.assign(), the spread operator, or by creating a subclass.

Can you show me an example using the spread operator?

Sure! Here's an example: const obj1 = { a: 1 }; const obj2 = { ...obj1, b: 2 }; Now obj2 has both properties.

What about using Object.assign()?

With Object.assign(), you can do it like this: const obj1 = { a: 1 }; const obj2 = Object.assign({}, obj1, { b: 2 }); This also creates a new object.

Are there any performance considerations I should be aware of?

Yes, using Object.assign() can be slower for large objects compared to the spread operator, so choose based on your needs.