Codewars 6 kyu Length of Missing Array JavaScript

this one uses the map(), sort(), and includes() methods

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[ARediting]

you could check the edges cases in top with
if(arrayOfArrays.length ===0) return 0
no?

[mattvail]

Woo! thank you. The part that was tripping me up was the last edge case of not being able to read length of null. I will give this another crack and see if I can solve it now that I know how you got around that error