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<head>
  <meta charset="utf-8">
  <title>Lodash flattenDepth — depth 2 list</title>
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<body>
  <h1>Lodash _.flattenDepth — depth 2</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var nested = [0, [1, [2, [3]]]];
      var result = _.flattenDepth(nested, 2);
      document.getElementById("out").textContent = JSON.stringify(result, null, 2);
    })();
  </script>
</body>
</html>

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Lodash _.flattenDepth — match flat(2) (Try It)