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<head>
  <meta charset="utf-8">
  <title>Lodash _.forOwn - drop empty values</title>
</head>
<body>
  <h1>_.forOwn - drop empty values</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var personInfo = {
        name: "Sam",
        age: 22,
        email: "sam@example.com",
        address: ""
      };
      _.forOwn(personInfo, function (value, key, obj) {
        if (value === "") {
          delete obj[key];
        }
      });
      document.getElementById("out").textContent =
        JSON.stringify(personInfo, null, 2);
    })();
  </script>
</body>
</html>

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Lodash _.forOwn - mutate in place: drop empty values (Try It)