// Define a Person class
class Person {
  constructor(nmFirst, nmLast, gender) {
    if (nmFirst == null || nmFirst == '') {
      throw ('First Name missing. Person not created.');
    }
    if (nmLast == null || nmLast == '') {
      throw ('Last Name missing. Person not created.');
    }
    if (gender == null || gender == '') {
      throw ('Gender missing. Person not created.');
    }
    if (gender == "M" || gender == "F") {
      // instantiate Person
      this.nmFirst = nmFirst;
      this.nmLast = nmLast;
      this.gender = gender;
      this.isSovereign = true;
      this.imageOf = 'I AM';
      this.grade = null;
    } else {
      throw ('Gender invalid, please pass M for male, or F for female. Person not created.');
    }

  }
  getName() {
    console.log(`Name: ${this.nmFirst} ${this.nmLast}`);
  }
  getImage() {
    console.log(`Image of: ${this.imageOf}`);
  }
  getSovereign() {
    console.log(`Sovereign: ${this.isSovereign}`);
  }
  getGender {
    console.log(`Gender: ${this.gender}`);
  }
  getCity{
    console.log(`City: ${this.city}`);
  }
  getState{
    console.log(`State: ${this.state}`);
  }
  getGrade() {
    console.log(`Grade: ${this.grade}`);
  }

  setCity(city) {
    this.city = city;
  }
  setState(state) {
    this.state = state;
  }
  setGrade(grade) {
    this.grade = grade;
  }

}

// create Tom
let personTomTestor = new Person('Tom', 'Testor', 'M');

// set location and grade
personTomTestor.setGrade(3.5);
personTomTestor.setCity('Wake Forest');
personTomTestor.setState('NC');

// get attributes of Tom
personTomTestor.getName();        // Tom Testor
personTomTestor.getImage();       // I AM
personTomTestor.getSovereign();   // true
personTomTestor.getGender();      // M
personTomTestor.getCity();        // Wake Forest
personTomTestor.getState();       // NC
personTomTestor.getGrade();       // 3.5