This one doesn’t work in Chrome when I submit the answer, works in Firefox though. FreeCodeCamp should have a bug report button at the bottom of each lesson.
The information provided in this lesson is innacurate (it relied on a lazy workaround rather than the correct implimentaion of the sort method). There is a revision to this lesson which has already been submitted and will be in the next update to FCC if it passes QA.
(There used to be a ‘report a bug’ button, but people were constantly clicking it and filing “bug reports” without getting help and discovering that their solution was not correct.)