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  <title>Lodash flatMapDeep — nested</title>
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  <h1>Lodash _.flatMapDeep — [n, [n+10]]</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      document.getElementById("out").textContent = JSON.stringify(
        _.flatMapDeep([1, 2], function (n) {
          return [n, [n + 10]];
        })
      );
    })();
  </script>
</body>
</html>

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Lodash _.flatMapDeep — scalar + nested (Try It)