How can I merge multiple objects in JavaScript?

How can I merge multiple objects in JavaScript?

You can use the Object.assign() method or the spread operator to merge objects. Which one would you like to know more about?

Can you show me an example using the spread operator?

Sure! You can merge objects like this: const merged = {...obj1, ...obj2}; This creates a new object with properties from both obj1 and obj2.

What happens if there are duplicate keys?

If there are duplicate keys, the last object's value will overwrite the previous ones. For example, const merged = {a: 1, b: 2, a: 3}; will result in {a: 3, b: 2}.

Are there any performance considerations I should be aware of?

Yes, merging large objects can be memory-intensive. It's best to avoid deep merging unless necessary, as it can slow down performance.