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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Lodash _.overArgs assign</title>
</head>
<body>
  <h1>Merge JSON strings</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var mergeJsonStrings = _.overArgs(Object.assign, [JSON.parse, JSON.parse]);
      document.getElementById("out").textContent = JSON.stringify(
        mergeJsonStrings('{"x":1}', '{"y":2}'),
        null,
        2
      );
    })();
  </script>
</body>
</html>

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Lodash _.overArgs — JSON.parse before assign (Try It)