Optimal-code-with-JavaScript/State.js at master · HabibAroua/Optimal-code-with-JavaScript · GitHub

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class OrderStatus
{
    constructor(name, nextStatus)
    {
        this.name = name;
        this.nextStatus = nextStatus;
    }

    next()
    {
        return new this.nextStatus();
    }
}

class WaitingForPayment extends OrderStatus
{
    constructor()
    {
        super('waitingForPayment',Shipping);
    }
}

class Shipping extends OrderStatus
{
    constructor()
    {
        super('shipping', Delivered);
    }
}

class Delivered extends OrderStatus
{
    constructor()
    {
        super('delivered',Delivered);
    }
}

class Order
{
    constructor()
    {
        this.state = new WaitingForPayment();
    }

    nextState()
    {
        this.state = this.state.next();
    }

    cancelOrder()
    {
        this.state.name === 'waitingForPayment' ? console.log('Order is canceled') : console.log('Order can not be canceled!');
    }
}

const myOrder = new Order();

console.log(myOrder.state.name);

myOrder.cancelOrder();