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<head>
  <meta charset="utf-8">
  <title>Lodash forEach — sum</title>
</head>
<body>
  <h1>Lodash _.forEach — running total</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var total = 0;
      _.forEach([12, 7, 30], function (n) {
        total += n;
      });
      document.getElementById("out").textContent = JSON.stringify(total);
    })();
  </script>
</body>
</html>

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Lodash _.forEach — sum (Try It)