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()

Keytron Brown
Keytron Brown
15,828 Points
Posted by Keytron Brown
Keytron Brown
15,828 Points

Help I dont know what to do next.

How do I get just the 20th century years out of this array?

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

century20 = years.filter(year => year );

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

1 Answer

Joseph Yhu
.a{fill-rule:evenodd;}techdegree seal-36
Joseph Yhu
PHP Development Techdegree Graduate 48,638 Points

Simple, just add a condition on the right side of year => year that checks if the year is in the 20th century, i.e. checks if the year is 2000 or earlier.