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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>mapValues vs mapKeys</title>
</head>
<body>
  <h1>mapValues vs mapKeys</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var obj = { a: 1, b: 2 };
    document.getElementById("out").textContent =
      JSON.stringify(_.mapValues(obj, function (v) {
        return v * 10;
      })) + "
" +
      JSON.stringify(_.mapKeys(obj, function (v, k) {
        return k.toUpperCase();
      }));
  </script>
</body>
</html>

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Lodash _.mapValues vs _.mapKeys (Try It)