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<head>
  <meta charset="utf-8">
  <title>updateWith — vs update</title>
</head>
<body>
  <h1>vs update</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var plain = {};
    var forced = {};
    _.update(plain, "[0][1]", _.constant("a"));
    _.updateWith(forced, "[0][1]", _.constant("a"), Object);
    document.getElementById("out").textContent = [
      JSON.stringify(plain),
      JSON.stringify(forced)
    ].join(String.fromCharCode(10));
  </script>
</body>
</html>

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Lodash _.updateWith — vs update (Try It)