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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array reverse() — basic</title>
</head>
<body>
  <h1>reverse() — in place</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var numbers = [1, 2, 3, 4, 5];
      numbers.reverse();
      document.getElementById("out").textContent = JSON.stringify(numbers);
    })();
  </script>
</body>
</html>

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JavaScript Array reverse() — in place (Try It)