iteration.js

const Employee = function(fName, lName, project) {
  this.firstName = fName;
  this.lastName = lName;
  this.project = project;
  this.getFullName = function() {
    return this.lastName + ", " + this.firstName;
  }
};
Employee.prototype.managerId = 123;
Employee.prototype.sayHello = function() {
  console.log("Hello");
};
// ---------------------------------------------

function convertToString(Employee) {
  var data = "";
  for (let empdata in Employee) {

    if (Employee.hasOwnProperty(empdata) && !isFunction(Employee[empdata])) {
      if (isObject(Employee[empdata])) {
        //          console.log(JSON.stringify(Employee[empdata]));
        data += convertToString(Employee[empdata]);
      } else {
        data += Employee[empdata] + ", ";
      }

    }
  }
  return data;
  // console.log("data--->", data);
}

function isFunction(property) {
  return property && {}.toString.call(property) === '[object Function]';
}

function isObject(property) {
  return property && {}.toString.call(property) === '[object Object]';
}
// ---------------------------------------------
/**
 * Returns true if all tests pass; otherwise, returns false.
 */
function doTestsPass(testCases) {
  // todo: add more test cases
  return testCases.reduce((result, testCase) => {
    const answer = convertToString(testCase.inputs);
    console.info("expected: ", testCase.expected, ", answer: ", answer);
    return result && (answer === testCase.expected);
  }, true);
}

const testCases = [{
  expected: "Frank, Sinatra, 1, Trader Platform, ",
  inputs: new Employee("Frank", "Sinatra", {
    id: 1,
    name: "Trader Platform"
  })
}];

/**
 * Main execution entry.
 */
if (doTestsPass(testCases)) {
  console.log("All tests pass!");
} else {
  console.log("There are test failures.");
}