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()

Ali .
Ali .
15,521 Points

What's wrong?

Can I know what is the issue?

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 = purchaseItems
  .filter((debts, prices) => debts.debt == 'groceries' + prices.price)
  .reduce((sum,prices ) =>  sum + prices.price , 0);

console.log(groceryTotal)
 // groceryTotal should be: 9.47
// Write your code below

1 Answer

Steven Parker
Steven Parker
229,732 Points

You're close, but there's a few issues:

  • the callback in "filter" gets only one argument
  • you have "debt" instead of "dept" (with a "p")
  • the price won't be involved in the filter
  • the "sum" should be included with the price in the "reduce" expression
Ali .
Ali .
15,521 Points

Thank you a lot, Steven.