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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.
Try again, I've already enabled Node v18.
That's because Node v8 doesn't support it.
Forget about "Big" numbers and work with strings instead.
Because that would make the kata too easy in that language. Instead, you are expected to implement the algorithm more thoroughly by yourself using strings.
Read this: https://docs.codewars.com/training/troubleshooting#works-but-no you're using a global var.