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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.
Didn't know you could use map like that! Way cool
I got there in the end but the instructions were not very clear. It does not say what to return when the total is not greater than ten. The example also show new Date('...') = 5 when it would have been helpful to see solution(new Date('...')) = 5.