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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.
Needs random tests.
Description has zero formatting.
Please learn how to use Markdown and make the description readable to everyone else.
The description is very unclear. I had to guess what you meant by 'order of insertion' and 'every next item'. There are also no instructions of what to do when the function is called with no arguments.