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 filter()

Posted by Hanwen Zhang
Hanwen Zhang
20,084 Points

Why my code is not working here?

Using the filter method on the years array, return an array of only the years in the twentieth century (remember: the twentieth century includes the year "2000"). See the comments for the correct result. Store the new array in the variable century20.

// century20 should be: [1989, 2000, 1999, 1973] // Write your code below

app.js 
const years = [1989, 2015, 2000, 1999, 2013, 1973, 2012];
let century20 = years.filter(year =>  year <= 2000);

// century20 should be: [1989, 2000, 1999, 1973]
// Write your code below

1 Answer

Peter Vann
Peter Vann
36,427 Points

Hi Hanwen!

You have the same issue here.

As usual, your code is fine (technically correct in the real world), but to pass, you need to assign your filter results to century20 on a separate line.

The challenges are kind of ornery that way!?! LOL

This passes:

const years = [1989, 2015, 2000, 1999, 2013, 1973, 2012];
let century20;

// century20 should be: [1989, 2000, 1999, 1973]
// Write your code below
century20 = years.filter(year =>  year <= 2000);

I hope that helps.

Stay safe and happy coding!

Hanwen Zhang
Hanwen Zhang
20,084 Points

It passed now!! Glad to know my code would technically be correct in the real world LOL. Thank you, Peter