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.
if you solve the kata MongoDB object ID, you can know exactly how old this (and any other) solution is ;-)
If you see the oldest comment, it's from 8 years ago. The solution can be older than that.
This solution likely comes from a time when
letdidn't exist in JS