Object oriented features

    // Person constructor
    function Person(name, dob) {
        this.name = name;
        // this.age = age;
        this.birthday = new Date(dob);
        this.calculateAge = function(){
            const diff = Date.now() - this.birthday.getTime();
            const ageDate = new Date(diff);
            return Math.abs(ageDate.getUTCFullYear() - 1970);
        }
    }

    // const brad = new Person('Brad', 36);
    // const john = new Person('John', 30);
    // console.log(john.age);

    const brad = new Person('Brad', '9-10-1981');
    console.log(brad.calculateAge());

    const name1 = 'Jeff';
    const name2 = new String('Jeff');
    console.log(typeof name2);

    // Function
    const getSum1 = function(x, y){
        return x + y;
    }
    const getSum2 = new Function('x','y', 'return 1 + 1');
    console.log(getSum2(1,1)); //result: 2

    // Object
    const john1 = {name: "John"};
    const john2 = new Object({name: "John"});
    console.log(john2);

    // Arrays
    const arr1 = [1,2,3,4];
    const arr2 = new Array(1,2,3,4);

    // Regular Expressions
    const re1 = /\w+/;
    const re2 = new RegExp('\\w+');
    console.log(re2);

    //Object.prototype
    //Person.prototype

    // Person constructor
    function Person(firstName, lastName, dob) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.birthday = new Date(dob);
        // this.calculateAge = function(){
        // const diff = Date.now() - this.birthday.getTime();
        // const ageDate = new Date(diff);
        // return Math.abs(ageDate.getUTCFullYear() - 1970);
        // }
    }

    // Calculate age
    Person.prototype.calculateAge = function(){
        const diff = Date.now() - this.birthday.getTime();
        const ageDate = new Date(diff);
        return Math.abs(ageDate.getUTCFullYear() - 1970);
    }

    // Get full name
    Person.prototype.getFullName = function(){
        return `${this.firstName} ${this.lastName}`;
    }

    // Gets Married
    Person.prototype.getsMaried = function(newLastName){
        this.lastName = newLastName;
    }
    const john = new Person('John', 'Doe', '8-12-90');
    const mary = new Person('Mary', 'Johnson', 'March 20 1978');
    console.log(mary);
    console.log(john.calculateAge());
    console.log(mary.getFullName());
    mary.getsMaried('Smith');
    console.log(mary.getFullName());
    console.log(mary.hasOwnProperty('firstName'));
    console.log(mary.hasOwnProperty('getFullName'));

    // Person constructor
    function Person(firstName, lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }
    // Greeting
    Person.prototype.greeting = function(){
        return `Hello there ${this.firstName} ${this.lastName}`;
    }
    const person1 = new Person('John', 'Doe');
    console.log(person1.greeting());

    // Customer constructor
    function Customer(firstName, lastName, phone, membership) {
        Person.call(this, firstName, lastName);
        this.phone = phone;
        this.membership = membership;
    }

    // Inherit the Person prototype methods
    Customer.prototype = Object.create(Person.prototype);
    // Make customer.prototype return Customer()
    Customer.prototype.constructor = Customer;

    // Create customer
    const customer1 = new Customer('Tom', 'Smith', '555-555-5555', 'Standard');
    console.log(customer1);

    // Customer greeting
    Customer.prototype.greeting = function(){
        return `Hello there ${this.firstName} ${this.lastName} 
                welcome to our company`;
    }

    console.log(customer1.greeting());

    const personPrototypes = {
        greeting: function() {
            return `Hello there ${this.firstName} ${this.lastName}`;
        },
        getsMarried: function(newLastName) {
            this.lastName = newLastName;
        }
    }

    const mary = Object.create(personPrototypes);
    mary.firstName = 'Mary';
    mary.lastName = 'Williams';
    mary.age = 30;
    mary.getsMarried('Thompson');
    console.log(mary.greeting());

    const brad = Object.create(personPrototypes, {
        firstName: {value: 'Brad'},
        lastName: {value: 'Traversy'},
        age: {value: 36}
    });

    console.log(brad);
    console.log(brad.greeting());

    class Person {
        constructor(firstName, lastName, dob) {
            this.firstName = firstName;
            this.lastName = lastName;
            this.birthday = new Date(dob);
        }
        greeting() {
            return `Hello there ${this.firstName} ${this.lastName}`;
        }
        calculateAge() {
            const diff = Date.now() - this.birthday.getTime();
            const ageDate = new Date(diff);
            return Math.abs(ageDate.getUTCFullYear() - 1970);
        }
        getsMarried(newLastName) {
            this.lastName = newLastName;
        }
        static addNumbers(x, y) {
            return x + y;
        }
    }

    const mary = new Person('Mary', 'Williams', '11-13-1980');
    mary.getsMarried('Thompson');
    console.log(mary);
    console.log(Person.addNumbers(1,2));

    class Person {
        constructor(firstName, lastName) {
            this.firstName = firstName;
            this.lastName = lastName;
        }
        greeting() {
            return `Hello there ${this.firstName} ${this.lastName}`;
        }
    }

    class Customer extends Person {
        constructor(firstName, lastName, phone, membership) {
            super(firstName, lastName);
            this.phone = phone;
            this.membership = membership;
        }
        static getMembershipCost() {
            return 500;
        }
    }

    const john = new Customer('John', 'Doe', '555-555-5555', 'Standard');
    console.log(john.greeting());
    console.log(Customer.getMembershipCost());