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 Array Manipulation Practice reduce()

.return

How can I complete this task ? Thanks!

app.js
const phoneNumbers = ["(503) 123-4567", "(646) 123-4567", "(503) 987-6543", "(503) 234-5678", "(212) 123-4567", "(416) 123-4567"];
let numberOf503;

// numberOf503 should be: 3
// Write your code below
numberOf503 = phoneNumbers.reduce( number => {
  if(number === charAt(503){
        return numberOf503;
     }

})
Reggie Williams
Reggie Williams
Treehouse Teacher

Hey Azzie Fuzzie the charAt method will return the characters at a given index. It looks like you're attempting to check if the numbers start with 503 using the charAt() method. Try instead using a method like substring then inside your return statement, make sure you return number instead of numberOf503

1 Answer

Thanks