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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.
you are asked for this: https://en.wikipedia.org/wiki/Complement_(set_theory)#Relative_complement
you are doing this: https://en.wikipedia.org/wiki/Symmetric_difference
i am close to giving up at this point, filtered the 2 arrays to get the unique values for both and the returned the concatenated unique values as an array, i even passed the sample arrays and got the exact same answers, but it's still not accepting my answer
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