Solve 'Fun with ES6 Classes #1 - People, people, people'

[odv]

https://www.codewars.com/kata/fun-with-es6-classes-number-1-people-people-people/train/javascript

[RazvanBugoi]

class Person {
  constructor(firstName = "John", lastName = "Doe", age = 0, gender = "Male") {
    this.firstName = firstName;
    this.lastName = lastName;
    this.age = age;
    this.gender = gender;
  }

  sayFullName() {
    return `${this.firstName} ${this.lastName}`;
  }

  static greetExtraTerrestrials(raceName) {
    return `Welcome to Planet Earth ${raceName}`}
}