An example of using reduce on an array of prices.

reduce-example1.js

/* Reduce Example 
* Go through each element and return a value when combining the previous element with the curr element
*/

const shoppingListPrices = [10.21, 20.33, 40, 33.5, 5, 2, 7, 9, 9.99, 10.99];
/* ES6 */
const totalPrice = shoppingListPrices.reduce((start, curr) => start + curr, 0);
/* ES5 */

const totalPrice2 = shoppingListPrices.reduce(function (start, curr) {
  return start + curr;
}, 0);
console.log("Shopping List",shoppingListPrices); //ShoppingList [10.21, 20.33, 40, 33.5, 5, 2, 7, 9, 9.99, 10.99]
console.log(totalPrice); //148.02
console.log(totalPrice2); //148.02