Find N Unique Integers Sum up to Zero LeetCode solution in JavaScript

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var sumZero = function (n) {
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  var num = Math.floor(n / 2);
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  var res = [];
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  for (var i = 1; i <= num; i++) {
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    res.push(i, -i);
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  }
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  if (n % 2 !== 0) {
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    res.push(0);
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  }
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  return res;
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};