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.
This comment is hidden because it contains spoiler information about the solution
Exactly!
Maybe because you didn't use the initial value.
Sounds like you used 52 characters...
That's dangerous. If you skip it and the array has a length of one, you'll try to add the first element with undefined. So it's better practices to add it anyway (only case where you can forget it is when you're absolutely sure there are at least 2 elements.
What you cannot skip, tho: the spoiler flag. ;p