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Comment by mirekrusin | Hacker News Reader

    let top5 = Array(5).fill({
      idx: 0,
      count: 0,
    });

...this kind of code is nice source of bugs in js.

How?

Because it uses the same object for all items in the array. Luckily, they are just placeholders and aren't being mutated.

Ah interesting. I see it now. Thanks for the reply.