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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.
True, self.juices should be emptied if everything is poured out (amount >= self.amount).
In this case there is no difference between
raise TypeError.new "#{n} is invalid"
and
raise TypeError, "#{n} is invalid"
The second form is preferable however.