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  <title>Lodash _.assignIn — mixin</title>
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  <h1>_.assignIn — prototype mixin</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var proto = {
        greet: function () { return "hi " + this.name; }
      };
      var instance = Object.create(proto);
      instance.name = "Ada";
      var flat = _.assignIn({}, instance);
      document.getElementById("out").textContent = flat.greet();
    })();
  </script>
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Lodash _.assignIn — mixin from prototype (Try It)