What are spread and rest operators in JavaScript?

Can you explain what spread and rest operators are in JavaScript?

Sure! The spread operator (...) allows you to expand an iterable (like an array) into its individual elements. The rest operator, also denoted by (...), collects multiple elements into a single array.

Can you give me an example of how to use the spread operator?

Absolutely! For example, you can use the spread operator to combine two arrays: const arr1 = [1, 2]; const arr2 = [3, 4]; const combined = [...arr1, ...arr2]; // [1, 2, 3, 4].

And how about the rest operator?

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

Thanks! Are there any performance considerations when using these operators?

Yes, while they are very useful, using them on large arrays can lead to performance issues due to the creation of new arrays. It's good to be mindful of that.