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  <meta charset="UTF-8">

  <title>Lodash cloneDeep</title>

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  <h1>_.cloneDeep demo</h1>

  <pre id="out"></pre>



  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>

  <script>

    const original = { items: [1, 2], meta: { ok: true } };

    const copy = _.cloneDeep(original);

    copy.items.push(3);



    document.getElementById('out').textContent =

      'original.items.length: ' + original.items.length + '\n' +

      'copy.items.length: ' + copy.items.length;

  </script>

</body>

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Lodash Introduction — _.cloneDeep