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 Loops, Arrays and Objects Tracking Multiple Items with Arrays Two-Dimensional Arrays

Clinton Tessin
Clinton Tessin
10,084 Points
Posted by Clinton Tessin
Clinton Tessin
10,084 Points

I can not get my JS to work.

https://w.trhou.se/slmo18z78s

I can't find my mistake anywhere.

2 Answers

Steven Parker
Steven Parker
229,732 Points
Steven Parker
Steven Parker
229,732 Points

It's on line 16, where you have this:

  for ( var i = 0; i < list.length; i += 1) {

The term "list" has not been defined anywhere. It looks like you might want "songs" there instead.

Tabatha Trahan
Tabatha Trahan
21,422 Points
Tabatha Trahan
Tabatha Trahan
21,422 Points

It looks like the issue may be with this function:

function printSongs( songs ) {
  var listHTML = '<ol>';
  for ( var i = 0; i < list.length; i += 1) {
    listHTML += '<li>' + songs[i][0] + ' by ' + songs[i][1] + '</li>';
  }

You use the parameter songs to accept a list, but you call the length method on a variable called list (which is never declared or initiated anywhere else. Give that a shot to see if it works.