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.
I'm using JS and get that:
Time: 265ms Passed: 2 Failed: 0 Errors: 1
Test Results:
✔ Test Passed: Value == 0
✔ Test Passed: Value == 0
ReferenceError: document is not defined
at duplicateCount
What does it mean?