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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.
Duplicate.
Needs random tests.
The kata setup really needs to be rewritten. For starters, everything in user code should be wrapped in a class. Currently variables are operated in global scope ;-(
This test makes no sense:
If the node has no child then it's a leave, even if it's a root node.