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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>String.trimEnd() — foo</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var str = "   foo  ";
    var lines = [String(str.length)];
    str = str.trimEnd();
    lines.push(String(str.length));
    lines.push(str);
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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String.trimEnd() — length (Try It)