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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 have posted a better version with explanation here [https://www.codewars.com/kata/reviews/6001e813dd245e0001e32303/groups/601f0be36aef7e00019452c0]
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None means that your function did not return anything. If your function would have, for example, returned the number 3 the output would be: "3 should equal [2]"
You can return an empty list with:
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