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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 would like to add just one thing to @Blind4Basics's good explanation: in this flow replace function is a callback.
Loved the kata! I think 5 kyu is appropriate--I wrote an inefficient solution checker and I'd be curious to try a 4 kyu version with more rigorous test cases.
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