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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.
"First item in list is correct" tests
head()
.head()
is expected to return the data associated with the list head rather than the node itself. Still figuring out the others...Edit: oh okay. The naming of this method has left me completely fooled. This method is supposed to return just the data of the node at hand and not traverse the list all the way to its beginning ("first node", quoting the kata). At least this is what fixed tests in my case.