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    Saturday, March 15

    Asynchronous Programming in JavaScript – Homework given in Ep-03 Season 2

    Chosen Topic 589 Comments1 Min ReadAnush NarayananBy
    const cart = [“shoes”, “pant”, “kurta”];
    const orderId = “12345”;
    const accountId = “someId001”;
    let walletBalance = “1000”;
    function createOrder(orderId) {
     returnnewPromise((resolve, reject) => {
     setTimeout(() => {
     console.log(`OrderId : ${orderId} Created`);
     resolve(orderId);
     }, 5000);
     });
    }
    function proceedToPayment(orderId) {
     returnnewPromise((resolve, reject) => {
     setTimeout(() => {
     console.log(`Payment processed for Order Id: ${orderId}`);
     resolve(orderId);
    }, 1000);
    });
    }

    function showOrderSummary(orderId) {
     returnnewPromise((resolve) => {
     console.log(`order summary for ${orderId} is ${cart.join(“, “)}`);
     resolve(orderId);
     });
    }

    function updateWallet(userAccountId) {
     returnnewPromise((resolve) => {
     constcost=800; // just assume that the total cost is 800rs
     walletBalance-=cost;
     console.log(`total amount left in the wallet is : ${walletBalance} rs`);
     resolve(walletBalance);
     });
    }

    createOrder(orderId)
    .then((orderId) => proceedToPayment(orderId))
    .then((orderId) => showOrderSummary(orderId))
    .then(() => updateWallet(accountId))
    .catch((err) => {
    console.log(err.message);
    });
    Here is one humble attempt to make the promise chaining in working.

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