When should I use spread or rest operators in JavaScript?

Can you explain when to use spread and rest operators in JavaScript?

Sure! The spread operator is used to expand elements of an iterable, while the rest operator collects multiple elements into an array.

Can you give me an example of the spread operator?

Absolutely! For instance, you can use it to combine arrays: const arr1 = [1, 2]; const arr2 = [3, 4]; const combined = [...arr1, ...arr2]; This results in [1, 2, 3, 4].

And what about the rest operator?

The rest operator is used in function parameters to gather arguments into an array. For example: function sum(...numbers) { return numbers.reduce((acc, num) => acc + num, 0); }.

Thanks! Are there any performance considerations I should be aware of?

Yes, while both operators are very useful, using them excessively in large data sets can lead to performance issues due to the creation of new arrays.