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  <title>Lodash flatMapDeep — triple</title>
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<body>
  <h1>Lodash _.flatMapDeep — [[[x, x+1]]]</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([10, 20], function (x) {
          return [[[x, x + 1]]];
        })
      );
    })();
  </script>
</body>
</html>

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Lodash _.flatMapDeep — triple nest (Try It)