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<head>
  <meta charset="utf-8">
  <title>sumBy — vs sum</title>
</head>
<body>
  <h1>sum vs sumBy</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 objects = [{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }];
    document.getElementById("out").textContent = [
      String(_.sum(nums)),
      String(_.sumBy(objects, "n"))
    ].join("\n");
  </script>
</body>
</html>

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Lodash _.sum vs _.sumBy (Try It)