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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.
This Kata was great. I had some difficulties to find out, what I have to do with .makeCoffee().
Only the bad thing is that Codewars say I forfeited, so I didn't get my points ...
I think ver0man has right.
https://www.codewars.com/kata/array-dot-diff
I used almost the same code, only changed variable name...