Loading collection data...
Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
yes, but why
I've enabled Node 14, copy your code, click reset to refresh the tests and try again. Make sure Node 14 is selected.
Because it depends on Node's version.
Please read this: https://docs.codewars.com/training/troubleshooting
Exactly that, your code is trying to read
lengthproperty ofnull. Search where in your code you're doing that.