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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>toPairs — transform</title>
</head>
<body>
  <h1>Transform pairs</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var pairs = _.toPairs({ a: 1, b: 2 });
    var upper = _.map(pairs, function (pair) {
      return [pair[0].toUpperCase(), pair[1]];
    });
    document.getElementById("out").textContent =
      JSON.stringify(_.fromPairs(upper));
  </script>
</body>
</html>

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Lodash _.toPairs — transform (Try It)