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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.
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Thanks for the help(I finished), turns out my problem was that I was calling functions within a function
so when I returned [] it wasnt passed on but stayed in the local memory of the outer function.
I had some problems understanding the error handling too.
Errors, if:
The three functions should respectively return [], [[],[]] and [].
So the first function should return [], the second one should return [[],[]], and the last [].
I hope this is going to help you.
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