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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.
I always forget about sets, guess I have to train on these, thanks for the tip!
Nice trick, I'll keep that in mind.
x == r[-1] throws 'list index out of range'. Logic must be modified if list is empty. Also, == does object comparison, not value. Use x is list[idx] for value comparison
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