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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array valueOf() — coercion</title>
</head>
<body>
  <h1>valueOf() — string coercion</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var numbers = [1, 2, 3];
      document.getElementById("out").textContent =
        "Values: " + numbers.valueOf();
    })();
  </script>
</body>
</html>

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JavaScript Array valueOf() — string coercion (Try It)