Answers for "is there any difference between the reduce function and the spread of values operator in js"

the rest operator javascript

function sum(...numbers) {
	return numbers.reduce((accumulator, current) => {
		return accumulator += current;
	});
};
 
sum(1,2) // 3
sum(1,2,3,4,5) // 15

.reduce mdn

arr.reduce(callback( accumulator, currentValue[, index[, array]] )[, initialValue])