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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array flat() — default</title>
</head>
<body>
  <h1>flat() — one level</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var nested = [1, [2, [3, 4, [5]]]];
      var flattened = nested.flat();
      document.getElementById("out").textContent = JSON.stringify(flattened);
    })();
  </script>
</body>
</html>

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JavaScript Array flat() — default depth (Try It)