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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>String.at()</title>
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<body>
  <pre id="out"></pre>
  <script>
    var sentence = "The quick brown fox jumps over the lazy dog.";
    var index = -4;
    document.getElementById("out").textContent =
      "An index of " + index + " returns the character " + sentence.at(index);
  </script>
</body>
</html>

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String.at() — negative index (Try It)