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  <title>Lodash _.functionsIn - prototype methods</title>
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  <h1>_.functionsIn - prototype methods</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      function Animal(name) {
        this.name = name;
      }
      Animal.prototype.sayHello = function () {
        return "Hello, I'm " + this.name + "!";
      };
      var dog = new Animal("Buddy");
      document.getElementById("out").textContent =
        JSON.stringify(_.functionsIn(dog));
    })();
  </script>
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Lodash _.functionsIn - include enumerable prototype methods (Try It)