creating promise 2

 let cart = ["shoes", "pants", "kurtas"];

createOrder(cart)

    .then(function(res) {

        console.log(res);

        // promise chaining

        return res;

    })

    .then(function(res) {

        return proceedToPayment(res);

    })

    .then(function(paymentInfo) {

        console.log(paymentInfo);

    })

    .catch(err => {

        console.log(err.message);

    });

// start api which is running to order creation:---

function createOrder(cart) {

    const myPromise = new Promise(function(resolve, reject) {

        if (!validiteCart(cart)) {

            const err = new Error('Cart is not valid');

            reject(err);

        } else {

            const orderId = '123';

            setTimeout(() => {

                resolve(orderId);

            }, 5000);

        }

    });

    return myPromise;

}

function proceedToPayment(orderId) {

    // we will do payment

    return new Promise((resolve, reject) => {

        resolve("Payment successful");

    });

}

// end api which is running to order creation:--

// proceed to payment api:--

// end of proceed to payment api:--

function validiteCart(cart) {

    return true; // Assume the cart is always valid for this example

    // return false;

}