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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array valueOf() — vs toString</title>
</head>
<body>
  <h1>valueOf() vs toString()</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var nums = [10, 20, 30];
      document.getElementById("out").textContent =
        typeof nums.valueOf() + "\n" +
        typeof nums.toString() + "\n" +
        nums.toString();
    })();
  </script>
</body>
</html>

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JavaScript Array valueOf() — vs toString (Try It)