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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>forIn — collect</title>
</head>
<body>
  <h1>Collect keys</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var source = { x: 10, y: 20 };
    var pairs = [];
    var same = _.forIn(source, function (value, key) {
      pairs.push(key + "=" + value);
    });
    document.getElementById("out").textContent =
      JSON.stringify(pairs) + "\n" +
      "same === source: " + (same === source);
  </script>
</body>
</html>

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Lodash _.forIn — collect keys (Try It)