Simplest ‘getUniqueValues’ in JavaScript arrays

I’ve been finding this question a lot in job interview exercises, and I always take more time than I should to solve it because I keep forgetting how to do it.

This might not be the best/fastest solution, but it’s the simplest I’ve found to do it:

[...].filter(function (val, idx, arr) {
 return arr.indexOf(val) === arr.lastIndexOf(val);
});

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