Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array

I need to check a JavaScript array to see if there are any duplicate values. What's the easiest way to do this? I just need to find what the duplicated values are - I don't actually need their indexes or how many times they are duplicated. I know I can loop through the array and check all the other values for a match, but it seems like there should be an easier way. ### Similar question: - https://stackoverflow.com/questions/1960473
There seems to be years of confusion about what this question asks. I needed to know what elements in the array were duplicated: "I just need to find what the duplicated values are". The correct answer should NOT remove duplicates from the array. That's the inverse of what I wanted: a list of the duplicates, not a list of unique elements.

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