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  <title>Lodash _.functionsIn - class caveat</title>
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  <h1>_.functionsIn - class caveat</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      class MathOperations {
        add(a, b) { return a + b; }
        subtract(a, b) { return a - b; }
      }
      var math = new MathOperations();
      var lines = [];
      lines.push("functionsIn(math): " + JSON.stringify(_.functionsIn(math)));
      lines.push("Object.keys(MathOperations.prototype): " + JSON.stringify(Object.keys(MathOperations.prototype)));
      document.getElementById("out").textContent =
        lines.join(String.fromCharCode(10));
    })();
  </script>
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Lodash _.functionsIn - ES class method caveat (Try It)