What are the performance differences between spread and rest operators in JavaScript?

What are the performance differences between spread and rest operators in JavaScript?

The spread operator (...) is used to expand elements of an iterable, while the rest operator (...) collects multiple elements into an array. Performance can vary based on context.

Can you give me an example of each?

Sure! For the spread operator: const arr = [1, 2, 3]; const newArr = [...arr, 4, 5]; For the rest operator: function sum(...numbers) { return numbers.reduce((acc, num) => acc + num, 0); }

Which one is generally faster?

It depends on the use case. The spread operator can be faster for copying arrays, while the rest operator is efficient for handling variable arguments in functions.

Are there any scenarios where one is preferred over the other?

Yes, use the spread operator when you need to create a new array or object, and the rest operator when you want to gather arguments in a function.