How does the rest operator work in JavaScript?

Can you explain how the rest operator works in JavaScript?

Sure! The rest operator, represented by '...', allows you to collect multiple elements into an array. It's often used in function parameters.

Can you give me an example of how to use it?

Absolutely! Here's an example:

function sum(...numbers) {
  return numbers.reduce((acc, num) => acc + num, 0);
}
console.log(sum(1, 2, 3, 4)); // Outputs: 10

What happens if I don't pass any arguments?

If you don't pass any arguments, the rest operator will create an empty array. For example, sum() will return 0.

Are there any limitations to using the rest operator?

Yes, you can only use the rest operator as the last parameter in a function definition. You can't have other parameters after it.