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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>transform — rename</title>
</head>
<body>
  <h1>Rename keys</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    document.getElementById("out").textContent = JSON.stringify(
      _.transform({ a: 1, b: 2 }, function (result, value, key) {
        result[key.toUpperCase()] = value * 2;
      }, {})
    );
  </script>
</body>
</html>

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Lodash _.transform — rename keys (Try It)