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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array sort() — trap</title>
</head>
<body>
  <h1>Array.sort() — number pitfall</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var nums = [40, 5, 100, 9];
      nums.sort();
      document.getElementById("out").textContent = JSON.stringify(nums);
    })();
  </script>
</body>
</html>

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JavaScript Array sort() — number pitfall (Try It)