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  <title>Lodash _.transform - sum array</title>
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  <h1>_.transform - sum array</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var data = [1, 2, 3];
      var result = _.transform(data, function (acc, value) {
        acc.total += value;
      }, { total: 0 });
      var lines = [
        "accumulator:",
        JSON.stringify(result, null, 2),
        "",
        "sum (result.total): " + result.total
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
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