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<head>
  <meta charset="utf-8">
  <title>String.toWellFormed() — pairs</title>
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  <pre id="out"></pre>
  <script>
    var emoji = "😄";
    var fixed = emoji.toWellFormed();
    document.getElementById("out").textContent = [
      fixed,
      String(fixed === emoji),
      String(fixed.isWellFormed()),
      "hello".toWellFormed()
    ].join("\n");
  </script>
</body>
</html>

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String.toWellFormed() — valid pairs (Try It)