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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>at — dotted key</title>
</head>
<body>
  <h1>Key with a dot</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var object = { "a.b": 1, a: { b: 2 } };
    document.getElementById("out").textContent =
      JSON.stringify(_.at(object, "a.b")) + "\n" +
      JSON.stringify(_.at(object, [["a.b"]]));
  </script>
</body>
</html>

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Lodash _.at — dotted key (Try It)