Classes and subClasses ES6

Classes_subClasses.js

////////////////////////////////////////////////////Classes and subClasses

//ES5
var Person5 = function (name, yearOfBirth, job) {
  this.name = name;
  this.yearOfBirth = yearOfBirth;
  this.job = job;
};

Person5.prototype.calcAge = function () {
  var age = new Date().getFullYear() - this.yearOfBirth;
  console.log('ES5: ', age);
};

var Athlete5 = function (name, yearOfBirth, job, olympicGames, medals) {
  Person5.call(this, name, yearOfBirth, job);
  this.olympicGames = olympicGames;
  this.medals = medals;
};

Athlete5.prototype = Object.create(Person5.prototype);

Athlete5.prototype.wonMedals = function () {
  this.medals++;
  console.log(this.medals);
};

var johnAthlete5 = new Athlete5('John', 1990, 'swimmer', 3, 10);
johnAthlete5.calcAge();
johnAthlete5.wonMedals();

// ES6

class Person6 {
  constructor(name, yearOfBirth, job) {
    this.name = name;
    this.yearOfBirth = yearOfBirth;
    this.job = job;
  }
  calcAge() {
    const age = new Date().getFullYear() - this.yearOfBirth;
    console.log('ES6: ', age);
  }
}

class Athelete6 extends Person6 {
  constructor(name, yearOfBirth, job, olympicGames, medals) {
    super(name, yearOfBirth, job);
    this.olympicGames = olympicGames;
    this.medals = medals;
  }
  wonMedals() {
    this.medals++;
    console.log(this.medals);
  }
}

const johnAthlete6 = new Athelete6('John', 1990, 'cyclist', 2, 10);
johnAthlete6.calcAge();
johnAthlete6.wonMedals();