//ES5

var Person5 = function(name, yearOfBirth, job) {

this.name = name;

this.yearOfBirth = yearOfBirth;

this.job = job;

}

Person5.prototype.calculateAge = function() {

var age = new Date().getFullYear - this.yearOfBirth;

console.log(age);

}

var john5 = new Person5('John', 1990, 'teacher');

//ES6

class Person6 {

constructor (name, yearOfBirth, job) {

this.name = name;

this.yearOfBirth = yearOfBirth;

this.job = job;

}

calculateAge() {

var age = new Date().getFullYear - this.yearOfBirth;

console.log(age);

}

static greeting() {

console.log('Hey there!');

}

}

const john6 = new Person6('John', 1990, 'teacher');

Person6.greeting();