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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.
This is my favorite one. Clear and concise. That could be some code on a real project.
Why start with i = 1 and then return i - 1?
Clever! But it modifies the value of sign since it is passed as reference.