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  <title>Lodash flatten — mixed</title>
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  <h1>Lodash _.flatten — strings</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var result = _.flatten(["a", ["b", "c"], "d"]);
      document.getElementById("out").textContent = JSON.stringify(result, null, 2);
    })();
  </script>
</body>
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Lodash _.flatten — mixed values (Try It)