reduce()

.reduce() = reduce the elements of an array to a single value

const prices = [5, 30, 10, 25, 15, 20];
 
const total = prices.reduce(sum);
 
console.log(`$${total.toFixed(2)}`);
 
function sum(previous, next){
	return previous + next;
}

const grades = [56, 38, 90, 25, 15, 70];
 
const maximum = grades.reduce(getMax);
 
console.log(maximum);
 
function getMax(accumulator, element){
	return Math.max(accumulator, element);
}