When should I use rest or spread operators in JavaScript?

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

Sure! The rest operator (...) is used to collect multiple elements into an array, while the spread operator is used to expand an array or object into individual elements.

Can you give me an example of each?

Of course! For the rest operator, you might use it in a function to gather arguments: function sum(...numbers) { return numbers.reduce((a, b) => a + b, 0); }. For the spread operator, you can combine arrays like this: const arr1 = [1, 2]; const arr2 = [3, 4]; const combined = [...arr1, ...arr2];.

Are there any performance considerations I should be aware of?

Yes, while both operators are very useful, using them excessively in large datasets can lead to performance issues. It's best to use them judiciously.