Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript JavaScript Array Iteration Methods Combining Array Methods Combining filter() and reduce()

help please

Unexpected token +

app.js
const purchaseItems = [
    {
        name: 'apples',
        dept: 'groceries',
        price: 2.49
    },
    {
        name: 'bread',
        dept: 'groceries',
        price: 2.99
    },
    {
        name: 'batteries',
        dept: 'electronics',
        price: 5.80
    },
    {
        name: 'eggs',
        dept: 'groceries',
        price: 3.99
    },
    {
        name: 't-shirts',
        dept: 'apparel',
        price: 9.99
    }
];
let groceryTotal;

// groceryTotal should be: 9.47
// Write your code below
groceryTotal = purchaseItems.filter(items => items.dept === 'groceries')
.reduce((sum + items.price) => sum + items, 0);

2 Answers

joejee
joejee
10,141 Points

Reduce method cannot be used with an object. Try this

groceryTotal.map(item => item.price).reduce((sum, price) => sum+price);

Juan Luna Ramirez
Juan Luna Ramirez
9,038 Points

There is a syntax error in your reduce function. It should be (sum, item) => sum + item.price

// I'm omitting the items in the array to keep it short
// const purchaseItems = [...]

let groceryTotal;

groceryTotal = purchaseItems
  .filter(item => item.dept === 'groceries')
  .reduce((sum, item) => sum + item.price, 0)