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()

Posted by Shira Lotan
Shira Lotan
3,040 Points

What is wrong?

I'm getting an Unexpected token but I can't find my mistake

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

let numberOf503 = phoneNumbers.reduce=>{(count,areacode)
               if {areacode.startsWith('(503)'){
                 return count + 1}
                  return count},0);

1 Answer

Adam Beer
Adam Beer
11,314 Points
Adam Beer
Adam Beer
11,314 Points

There are only a few errors. First, if you declared let numberOf503 you shouldn't use let keyword after declaration in the code. Second, you use open "(" brackets instead of curly "{" open brackets.

numberOf503 = phoneNumbers.reduce((count,areacode) => {
   if (areacode.startsWith('(503)')) {
    count += 1;
   }
   return count;
},0);

I think if you correct your code then working fine for you.