??

?? ?? ?????(OOP)? ? ???? ??? ??? ??? ??? ???? ? ??? ???. JavaScript? ???? ??????? ES6 ????? OOP? ?? ??? ???? ??? ????? ?? ?? ????? ?? ????? ? ???? ??? ??????. ? ????? ???, ??, ???, ???? ??? JavaScript? ?? OOP ??? ????? ?? ? ?? ??? ?? JavaScript ?? ??? ????.

JavaScript? OOP ?? ??

1.???:
???? ???? ?? ?? ???? ???? ????? ?? ??? ?? ???? ???? ??? ? ????. ?? ?? ???? ?? ?????? ???? ???? ?? ??? ??? ? ????.

class Car {
    constructor(make, model) {
        this.make = make;
        this.model = model;
        this._engineOn = false;
    }

    startEngine() {
        this._engineOn = true;
        console.log(`${this.make} ${this.model} engine started.`);
    }

    stopEngine() {
        this._engineOn = false;
        console.log(`${this.make} ${this.model} engine stopped.`);
    }
}

const myCar = new Car("Toyota", "Corolla");
myCar.startEngine(); // Output: Toyota Corolla engine started.

2.??:
??? ???? ?? ???? ???? ?? ???? ???? ?? ???? ???? ?? ??? ??? ? ????.

class Animal {
    constructor(name) {
        this.name = name;
    }
    speak() {
        console.log(`${this.name} makes a sound.`);
    }
}

class Dog extends Animal {
    speak() {
        console.log(`${this.name} barks.`);
    }
}

const myDog = new Dog("Max");
myDog.speak(); // Output: Max barks.

3.???:
???? ?? ?? ?? ???? ??? ?? ?? ??? ??? ??? ? ????. JavaScript? ??? ???? ?? ???? ?????.

class Printer {
    print() {
        console.log("Printing document...");
    }
}

class PDFPrinter extends Printer {
    print() {
        console.log("Printing PDF document...");
    }
}

const printer = new Printer();
const pdfPrinter = new PDFPrinter();

printer.print(); // Printing document...
pdfPrinter.print(); // Printing PDF document...

4.???:
???? ??? ??? ???? ??? ???? ??????. ES2020??? #? ???? ??? ??? ???? ????? ???? ??????.

class Account {
    #balance;
    constructor(initialBalance) {
        this.#balance = initialBalance;
    }
    deposit(amount) {
        this.#balance += amount;
    }
    getBalance() {
        return this.#balance;
    }
}

const myAccount = new Account(1000);
myAccount.deposit(500);
console.log(myAccount.getBalance()); // Output: 1500

JavaScript? ????? ?? ??

JavaScript? ????? ????? ??? ???? ?? ?? ???? ?? ??? ? ????. ?? ?? ??? ???? ??? ???? ??? ?????? ?? ?????.

function Vehicle(type) {
   this.type = type;
}

Vehicle.prototype.start = function() {
   console.log(`${this.type} is starting.`);
};

const car = new Vehicle("Car");
car.start(); // Car is starting.

???? ??

????? ?? ??? ???? ??? ?? ??? ??? ???? ?? ? ?? ??? ??? ??? ??? ??? ??? ??? ?????.

const canFly = {
   fly() {
       console.log("Flying!");
   }
};

const canSwim = {
   swim() {
       console.log("Swimming!");
   }
};

function Fish(name) {
   this.name = name;
}

Object.assign(Fish.prototype, canSwim);

const fish = new Fish("Nemo");
fish.swim(); // Swimming!

JavaScript? ?? OOP ??

1. ??? ??:
??? ??? ??? ???? ???? ?? ??? ???? ??? ?????. ?? ?? ??? ????? ? ?????.

function createUser(name, role) {
    return {
        name,
        role,
        describe() {
            console.log(`${this.name} is a ${this.role}`);
        }
    };
}

const admin = createUser("Alice", "Administrator");
admin.describe(); // Alice is an Administrator

2. ??? ??:
???? ???? ????? ??? ?? ??? ?????. ???? ?????? ??? ?? ????? ??? ??? ??? ???? ? ?????.

const Singleton = (function () {
    let instance;
    function createInstance() {
        return new Object("I am the instance");
    }
    return {
        getInstance: function () {
            if (!instance) {
                instance = createInstance();
            }
            return instance;
        }
    };
})();

const instance1 = Singleton.getInstance();
const instance2 = Singleton.getInstance();

console.log(instance1 === instance2); // true

3. ??? ??:
??? ??? ? ??(??)? ?? ??? ?? ??(???)? ?? ???? ???? ?? ??? ?????.

class Car {
    constructor(make, model) {
        this.make = make;
        this.model = model;
        this._engineOn = false;
    }

    startEngine() {
        this._engineOn = true;
        console.log(`${this.make} ${this.model} engine started.`);
    }

    stopEngine() {
        this._engineOn = false;
        console.log(`${this.make} ${this.model} engine stopped.`);
    }
}

const myCar = new Car("Toyota", "Corolla");
myCar.startEngine(); // Output: Toyota Corolla engine started.

??? ?? ??

1. ?? ?? ??: ? ?? ???? ???? ?? ??? ?????.
2. ??? ???: ???? ?? ??? ???? ?? ???? ??????.
3. Object.freeze ??: ??? ?? ?? ??? ??? ???? ?? ??? ? ????.

???

OOP? ?? JavaScript? ?? ??? ????? ?? ??? ?? OOP? ??? ??? ????? ??? ?????. ??? ? ??? ??? ?? ES6? ??? ?? JavaScript? ???? ???? ??? ?? ??? ????? ??? ??????? ??? ? ????. JavaScript? OOP? ????? ?? ??????? ?? ?? ???? ?? ??? ???? ??? ??? ??? ??? ? ????.

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? ?? ????: https://shafayet.zya.me

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??? ?? ????

? ??? JavaScript?? ???? ?????(OOP)? ?????.? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!