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<head>
  <meta charset="utf-8">
  <title>String[Symbol.iterator]() — spread</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var s = "𝐀";
    document.getElementById("out").textContent = [
      String(s.length),
      JSON.stringify([...s]),
      JSON.stringify(s.charAt(0)),
      Array.from(s).join("-")
    ].join("\n");
  </script>
</body>
</html>

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String[Symbol.iterator]() — spread vs charAt (Try It)