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Discussion on: And then the interviewer asks, "Can you do this with less code?"

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Replies for: Haha, I thought so too. And I guess we could use let instead of const since it's one letter less.

 
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Jon Randy 🎖️ • 
const duplicateCheck = a => a.length - new Set(a).size;

Shorter and more useful since it returns the number of duplicates

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Michiel Hendriks • • Edited 
const duplicateCount = a => a.length - new Set(a).size;

And now with a meaningful name. Because, what does duplicateCheck mean, that is has, or does not have duplicates. For the boolean version hasDuplicates would be the better name.