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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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There are a couple of issues with the javascript version with the random test cases.
You are told in the details of the kata that the function "receives two arrays arr1 and arr2, each of them, with elements that occur only once",
however the random arrays will generate repeated values into the arrays which need to be accounted for and it's not clear that is neccesary to removed/ignore them to solve the kata.
Additionally, the second array is always empty in the random test cases.
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I'm so sorry for this. I'm working in improving my skills.
well, this is a way to do it I guess.