oop.js

// JavaScript OOP Concepts
/*
Concept-1:Object Literals
Concept-2:Constructor & This
Concept-3:Prototypes & Inheritence
Concept-4:Classes and Subclasses
*/

// Concept-1:Object Literals
const bookOne = {
    title:'Book One',
    author:'Jubayer Hossain',
    year:'2018',
    getSummary:function() {
        return `${this.title} was written by ${this.author} in ${this.year}`
    }
};
console.log(bookOne.title);
console.log(bookOne.getSummary());

const bookTwo = {
    title:'Book Two',
    author:'Tasmim Rahman',
    year:'2013',
    getSummary:function() {
        return `${this.title} was written by ${this.author} in ${this.year}`
    }
};
// Values and Keys
console.log(Object.values(bookTwo));
console.log(Object.keys(bookTwo));

// Concept-2:Constructor & This

function Book(title, author, year) {
    this.title = title;
    this.author = author;
    this.year = year;
    this.getSummary = function() {
        return `${this.title} was written by ${this.author} in ${this.year}`

    };

}
// Instantiate an object
const bookOne = new Book(
    'Book One',
    'Jubayer Hossain',
    '2015'
);
const bookTwo = new Book(
    'book Two',
    'Tasmim Rahman',
    '2016'
);
console.log(bookOne);
console.log(bookTwo);
console.log(bookOne.getSummary());
console.log(bookTwo.getSummary());

// Concept-3:Prototypes & Inheritence
function Book(title, author, year) {
    this.title = title;
    this.author = author;
    this.year = year;
}

// getSummary
Book.prototype.getSummary = function() {
    return `${this.title} was written by ${this.author} in ${this.year}`
};

// Magazine Constructor
function Magazine(title, author, year, month) {
    Book.call(this, title, author, year);
    this.month = month;
}

// Inheritence
Magazine.prototype = Object.create(Book.prototype);

const MagOne = new Magazine(
    'Mag One',
    'Tasmim Adib',
    '2017',
    'Jan'
);
// Use Magazine constructor
Magazine.prototype.constructor = Magazine;

console.log(MagOne.getSummary());
console.log(MagOne);

// Concept-4:Classes and Subclasses
class Book {
    constructor(title, author, year) {
        this.title = title;
        this.author = author;
        this.year = year;
    }

    getSummary() {
        return `${this.title} was written by ${this.author} in ${this.year}`
    };

    getAge() {
        const years = new Date().getFullYear() - this.year;
        return `${this.title} is ${years} years old!`
    }
    revise(newYear) {
    this.year = newYear;
    this.revised = true;
    }
    static topBookStore() {
        return 'Story & Nobles'
    }
}

// Instantiate Object
const bookOne = new Book('Book One', 'Tasmim Adib', '2014');
console.log(bookOne)
console.log(bookOne.getSummary());
console.log(bookOne.getAge());
! Revise
console.log(bookOne);
bookOne.revise('2018');
console.log(bookOne);
//  static method
console.log(Book.topBookStore());

// Magazine Subclasses
class Magazine extends Book {
    constructor (title, author, year, month) {
        super(title, author, year);
        this.month = month;
    }
}

const magOne = new Magazine('Magazine One','Tasmim Adib', '2014', 'Jan');
const magTwo = new Magazine('Magazine Two','Tasmim Rahman', '2012', 'Feb');
// console.log(magOne.getSummary());
// console.log(magOne.getAge());
console.log(magOne);
console.log(magTwo)