Asynchronous task order control by the callback function

const takeOrder = (customer, callback) => {
    console.log(`Take order for ${customer}`);
    callback(customer);
}

const processOrder = (customer, callback) => {
    console.log(`Processing order for ${customer}`);
    setTimeout(() => {
        console.log('Cooking completed');
        console.log(`Order processed for ${customer}`);
        callback(customer);
    }, 6000);
}

const completeOrder = (customer) => {
    console.log(`Completed order for ${customer}`);
}

takeOrder('customer 1', (customer) => {
    processOrder(customer, (customer) => {
        completeOrder(customer);
    });
});