Magento 2.3 How to check that customer is logged in using Js

Question

I want find the whether the customer is logged in or not using Js. I got some links but it dosen't works and i not good at knockout js. Please give solution with brief explanation

Referred Link :

How to check that customer is logged in on frontend in Magento 2.1?

Thanks.

Answer 1

<script type="text/javascript">
    define(['Magento_Customer/js/model/customer'], function (customer) {
        if (customer.isLoggedIn()) {
            // Do your Logic.
        }
    });
</script>

Answer 2

 require(['Magento_Customer/js/model/customer'], function (customer) {
        if (customer.isLoggedIn()) {
            console.log('Logged In');
        } else {
            console.log('Not Logged In');
        }
    });

Answer 3

**
 * This file will check that customer is logged in
 */
define(
    ['jquery', 'Magento_Customer/js/customer-data'],
    function ($, customerData) {
        'use strict';

        var getCustomerInfo = function () {
            var customer = customerData.get('customer');

            return customer();
        };

        var isLoggedIn = function (customerInfo) {
            customerInfo = customerInfo || getCustomerInfo();

            return customerInfo && customerInfo.firstname;
        };

        return function () {
            var deferred = $.Deferred();
            var customerInfo = getCustomerInfo();

            if (customerInfo && customerInfo.data_id) {
                deferred.resolve(isLoggedIn(customerInfo));
            } else {
                customerData.reload(['customer'], false)
                    .done(function () {
                        console.log(isLoggedIn());
                    })
                    .fail(function () {
                        deferred.reject();
                    });
            }

            return deferred;
        };
    }
);