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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>padEnd edge</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var padded = "Go".padEnd(6, "*");
    document.getElementById("out").textContent = [
      "ready".padEnd(5, "."),
      "ready".padEnd(3, "."),
      "x".padEnd(8, ""),
      padded.length,
      padded
    ].join("\n");
  </script>
</body>
</html>

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String.padEnd() — edge cases (Try It)