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()

Evan Loiterman
Evan Loiterman
4,233 Points

why is this wrong?

let century20=years.filter(year=> <2001);

simple. but it keeps telling me it's wrong

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


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

let century20=years.filter(year=> <2001);


console.log(century20)

3 Answers

Hi Evan

You're almost there, check out the docs

The first parameter is a callback function that returns true to keep the element, otherwise false.

In your attempt, you do no test the condition against anything, <= 2000 when it should be years <= 2000.

So your shorthand would look like the below:

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 );

and in case you find it more readable, the above is the same as below:

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 => {
  return year <= 2000;
});

hope this helps

Kevin Gates
Kevin Gates
15,053 Points

Should be >= or <=. You currently have year => <2001 which is not valid.

Evan Loiterman
Evan Loiterman
4,233 Points

let century20=years.filter(year=> year<=2001); will be accepted?