text: var multiplication = function (multiplying, multiplier) {
      return multiplying * multiplier;
  };
  var product = multiplication(3, 7);
  console.log("product", product);
  // Default parâmeter
  var fullName = function (firstName, lastName) {
      if (lastName === void 0) { lastName = "Giovane"; }
      return firstName + " " + lastName;
  };
  var myFullName = fullName("Vitor");
  console.log(myFullName);
  // Opitional parâmeter
  var incompleteName = function (firstName, lastName) {
      return firstName + " " + (lastName || "");
  };
  var myIncompleteName = incompleteName("Vitor");
  console.log(myIncompleteName);
  