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<head>
  <meta charset="utf-8">
  <title>String constructor — Symbol traps</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var sym = Symbol("example");
    var lines = [String(sym)];
    try { lines.push(String("" + sym)); } catch (e) { lines.push(e.name); }
    try { lines.push("".concat(sym)); } catch (e) { lines.push(e.name); }
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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String constructor — Symbol traps (Try It)