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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>forIn — vs forInRight</title>
</head>
<body>
  <h1>vs forInRight</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var left = [];
    var right = [];
    var data = { a: 1, b: 2, c: 3 };
    _.forIn(data, function (v, k) { left.push(k); });
    _.forInRight(data, function (v, k) { right.push(k); });
    document.getElementById("out").textContent =
      "forIn:      " + JSON.stringify(left) + "\n" +
      "forInRight: " + JSON.stringify(right);
  </script>
</body>
</html>

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Lodash _.forIn — vs forInRight (Try It)