What are the differences between spread and rest parameters in JavaScript?

What are the differences between spread and rest parameters in JavaScript?

Spread parameters allow an iterable to expand in places where multiple elements are expected, while rest parameters collect multiple elements into a single array.

Can you give me an example of each?

Sure! For spread, you can use it like this: const arr = [1, 2, 3]; const newArr = [...arr, 4, 5]; For rest, it looks like this: function sum(...numbers) { return numbers.reduce((acc, num) => acc + num, 0); }

Are there any limitations to using these parameters?

Yes, spread can only be used in specific contexts like function calls or array literals, while rest must be the last parameter in a function definition.

How do they affect performance?

In general, both spread and rest parameters are efficient, but excessive use can lead to performance issues, especially with large datasets.