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
Umar Ijaz
Courses Plus Student 7,278 PointsnumberOf503 not storing correct value
Hello All,
My code doesn't seem to be working and the error message is that numberOf503 is not storing the correct value.
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
const callBack = (total, phoneNum) => {
if(phoneNum.search('(503)') !== -1) { return (total + 1); }
}
numberOf503 = phoneNumbers.reduce(callBack, 0);
2 Answers
Simon Coates
8,481 PointsIt seems to accept:
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
function getTally(total, num) {
if(num.startsWith("(503)")) return total + 1;
else return total;
}
numberOf503 = phoneNumbers.reduce(getTally, 0);
Umar Ijaz
Courses Plus Student 7,278 PointsNvm, I think I figured it out. I need another return statement outside of the if statement, otherwise for cases that don't match the if condition the accumulator gets undefined.
Umar Ijaz
Courses Plus Student 7,278 PointsUmar Ijaz
Courses Plus Student 7,278 PointsHello Simon,
Yes, this is exactly what I figured the problem to be ( a missing else statement ) as noted in my message below. I didn't realize you had posted an answer until AFTER I posted my comment below. Nonetheless, I have voted your answer as the best answer.