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  <title>mixin — runInContext</title>
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  <h1>Isolated mixin with runInContext</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var lodash = _.runInContext();
    lodash.mixin({
      double: function (n) {
        return n * 2;
      }
    });
    var lines = [
      String(lodash.double(21)),
      String(typeof _.double)
    ];
    document.getElementById("out").textContent = lines.join("\n");
  </script>
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Lodash _.mixin — runInContext (Try It)