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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array copyWithin() — shift tail</title>
</head>
<body>
  <h1>copyWithin() — shift last three forward</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9];
      numbers.copyWithin(0, -3);
      document.getElementById("out").textContent = JSON.stringify(numbers);
    })();
  </script>
</body>
</html>

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JavaScript Array copyWithin() — shift last three (Try It)