rest_parameters_intro.js

// Let's create a function to calculate the sum of all values provided. Values can be indefinite.
// args is the name for the array
let addAllNumbers = (...args) => {
	// Initialize the total value with zero.
	let total = 0;
	// Loop through each numbers provided and add them
	for (let number of args) { total += number; }
	// Return the total value.
	return total;
}

console.log(addAllNumbers(1)); // This will output: 1

console.log(addAllNumbers(1, 2, 3)); // This will output: 6

console.log(addAllNumbers(1, 2, 3, 4)); // This will output: 10