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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>defaults — order</title>
</head>
<body>
  <h1>Source order</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(
        _.defaults({}, { a: 1 }, { a: 2, b: 3 }, { b: 4, c: 5 }),
        null,
        2
      );
  </script>
</body>
</html>

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Lodash _.defaults — source order (Try It)