MCA - Full Stack Web Development using MERN

The rest parameter is a feature introduced in ES6 (ECMAScript 2015) that allows a function to accept an indefinite number of arguments as an array. 

• Only one rest parameter is allowed per function.
• The rest parameter must be the last parameter.
• It does not capture arguments if they are explicitly named.

Syntax :

function functionName(...restParameter) {
  // restParameter is an actual array
}

Example :

function sum(...numbers) {
  return numbers.reduce((total, num) => total + num, 0);
}

console.log(sum(1, 2, 3));        // Output: 6
console.log(sum(5, 10, 15, 20));  // Output: 50
console.log(sum());               // Output: 0 (empty array)