Rest parameters

 Rest parameters

Rest parameters allow you to pass an arbitrary number of arguments to a function as an array. Here's an example:

function sum(...numbers) {

  return numbers.reduce((total, number) => total + number, 0);

}

console.log(sum(1, 2, 3)); // Output: 6

console.log(sum(4, 5, 6, 7)); // Output: 22

In the code above, the sum function takes an arbitrary number of arguments using the rest parameter syntax (...numbers). The function then uses the reduce method to add up all the numbers and return the total.