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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>noConflict — vs runInContext</title>
</head>
<body>
  <h1>noConflict + runInContext</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var lodash = _.noConflict();
    var isolated = lodash.runInContext();
    isolated.mixin({
      double: function (n) {
        return n * 2;
      }
    });
    document.getElementById("out").textContent =
      String(isolated.double(21));
  </script>
</body>
</html>

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Lodash _.noConflict — vs runInContext (Try It)