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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array flat() — mixed types</title>
</head>
<body>
  <h1>flat() — arrays vs objects</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var mixed = [1, { tags: ["a", "b"] }, [2, 3]];
      var result = mixed.flat(Infinity);
      document.getElementById("out").textContent = JSON.stringify(result);
    })();
  </script>
</body>
</html>

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JavaScript Array flat() — arrays not objects (Try It)