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

What are the differences between the 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.

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); }

Are they interchangeable?

No, they serve different purposes. The spread operator expands elements, while the rest operator gathers them.

What about their use in function parameters?

In function parameters, the rest operator allows you to capture all remaining arguments as an array, while the spread operator can be used to pass an array as individual arguments.