Some pages of freeCodeCamp not working

Some pages of freeCodeCamp not working
0

https://guide.freecodecamp.org/certifications/javascript-algorithms-and-data-structures/basic-data-structures/generate-an-array-of-all-object-keys-with-object-keys

This link go to 404 error , why page can not open?

Some guides are missing. They may not have been written at the time of the last update to the site, might be other reasons as well, not sure.

You can check it out on the github repo (it has spoilers so be warned).

Thank you ):ухмыляющийся: