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<head>
  <meta charset="utf-8">
  <title>updateWith — fallback</title>
</head>
<body>
  <h1>Fallback undefined</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var object = {};
    _.updateWith(object, "a.b", _.constant(1), function () {
      return undefined;
    });
    document.getElementById("out").textContent = JSON.stringify(object);
  </script>
</body>
</html>

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Lodash _.updateWith — fallback (Try It)