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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array at() — vs bracket</title>
</head>
<body>
  <h1>at(-1) vs array[-1]</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var languages = ["JavaScript", "Python", "Java", "C++", "Ruby"];
      var lines = [
        languages.at(-1),
        String(languages[-1]),
        languages[languages.length - 1]
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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JavaScript Array at() — vs bracket notation (Try It)