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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.
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Nice refactoring, @raffimolero!
Although I personally think that using "external" mutable state within a map() call is probably not the best of ideas. Maybe you could use scan() instead?
That jump() function is really simple and clever!
That filter() was really clever!
Nice one! I never really understood scan() until now.