Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

JavaScript JavaScript Array Iteration Methods Array Manipulation Practice filter()

Code return true instead of filtered array

I am trying the following challenge but I cannot seem to pass it, when I try

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

years.filter((yrs)=> {
  return century20 = yrs <= 2000


it gives me a boolean,but when I do

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

it works giving me a new array, but the challenge doesn't require the latter example.

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

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

years.filter(yrs=> century20 = yrs <= 2000)

1 Answer

You are setting century20 in the wrong place. The filter command needs a function which returns a boolean value for each element of the array. Remove the 'century20 =' from after the return and the function will now test to see if the year is <=2000 and return true if it is and false if it isn't. Then filter will filter the values you want. This is what you should store in century20. You need:

century20 = years.filter((yrs)=> {

return yrs <= 2000