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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>mean — compare</title>
</head>
<body>
  <h1>vs sum / meanBy</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var nums = [4, 2, 8, 6];
    var rows = [{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }];
    document.getElementById("out").textContent =
      _.mean(nums) + "\n" +
      _.sum(nums) + "\n" +
      _.meanBy(rows, "n");
  </script>
</body>
</html>

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Lodash _.mean — vs sum / meanBy (Try It)