Unique numbers from nested arrays, descending
Task
Write a function that returns the unique numbers sorted in descending order:
[[7, 72, 3, 4], [1, 3, 4, 4, 4, 65], [6, 3, 4, 5, 6, 1, 1, 1, 6, 9]]
// -> [72, 65, 9, 7, 6, 5, 4, 3, 1]The rest of this answer, with code and interview follow-ups, is in the DevPrep app.
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