Issue #7988 Typo changed also added comments for each index, getters and setters.

app/code/Magento/Checkout/view/frontend/web/js/checkout-data.js

@@ -15,39 +15,40 @@ define([
     'use strict';
 
     var cacheKey = 'checkout-data',
+        checkoutData,
 
         /**
-         * @param {Object} data
+         * @return {*}
          */
-        saveData = function (data) {
-            storage.set(cacheKey, data);
+        getData = function () {
+            return storage.get(cacheKey)();
         },
 
         /**
-         * @return {*}
+         * @param {Object} data
          */
-        getData = function () {
-            var data = storage.get(cacheKey)();
-
-            if ($.isEmptyObject(data)) {
-                data = {
-                    'selectedShippingAddress': null,
-                    'shippingAddressFromData': null,
-                    'newCustomerShippingAddress': null,
-                    'selectedShippingRate': null,
-                    'selectedPaymentMethod': null,
-                    'selectedBillingAddress': null,
-                    'billingAddressFormData': null,
-                    'newCustomerBillingAddress': null
-                };
-                saveData(data);
-            }
-
-            return data;
+        saveData = function (data) {
+            storage.set(cacheKey, data);
+        };
+
+    if ($.isEmptyObject(getData())) {
+        checkoutData = {
+            'selectedShippingAddress': null, //Selected shipping address pulled from persistence storage.
+            'shippingAddressFromData': null, //Shipping address pulled from persistence storage.
+            'newCustomerShippingAddress': null, //Shipping address pulled from persistence storage for new customer.
+            'selectedShippingRate': null, //Shipping rate pulled from persistence storage.
+            'selectedPaymentMethod': null, //Payment method pulled from persistence storage.
+            'selectedBillingAddress': null, //Selected billing address pulled from persistence storage.
+            'billingAddressFromData': null, //Billing address pulled from persistence storage.
+            'newCustomerBillingAddress': null //Billing address pulled from persistence storage for new customer.
         };
+        saveData(checkoutData);
+    }
 
     return {
         /**
+         * Setting the selected shipping address pulled from persistence storage.
+         * 
          * @param {Object} data
          */
         setSelectedShippingAddress: function (data) {
@@ -58,13 +59,17 @@ define([
         },
 
         /**
+         * Pulling the selected shipping address from persistence storage.
+         * 
          * @return {*}
          */
         getSelectedShippingAddress: function () {
             return getData().selectedShippingAddress;
         },
 
         /**
+         * Setting the shipping address pulled from persistence storage.
+         *
          * @param {Object} data
          */
         setShippingAddressFromData: function (data) {
@@ -75,13 +80,17 @@ define([
         },
 
         /**
+         * Pulling the shipping address from persistence storage. 
+         *
          * @return {*}
          */
         getShippingAddressFromData: function () {
             return getData().shippingAddressFromData;
         },
 
         /**
+         * Setting the shipping address pulled from persistence storage for new customer.
+         *
          * @param {Object} data
          */
         setNewCustomerShippingAddress: function (data) {
@@ -92,13 +101,17 @@ define([
         },
 
         /**
+         * Pulling the shipping address from persistence storage for new customer.
+         *
          * @return {*}
          */
         getNewCustomerShippingAddress: function () {
             return getData().newCustomerShippingAddress;
         },
 
         /**
+         * Setting the selected shipping rate pulled from persistence storage.
+         *
          * @param {Object} data
          */
         setSelectedShippingRate: function (data) {
@@ -109,13 +122,17 @@ define([
         },
 
         /**
+         * Pulling the selected shipping rate from local storge
+         *
          * @return {*}
          */
         getSelectedShippingRate: function () {
             return getData().selectedShippingRate;
         },
 
         /**
+         * Setting the selected payment method pulled from persistence storage.
+         *
          * @param {Object} data
          */
         setSelectedPaymentMethod: function (data) {
@@ -126,13 +143,17 @@ define([
         },
 
         /**
+         * Pulling the payment method from persistence storage.
+         *
          * @return {*}
          */
         getSelectedPaymentMethod: function () {
             return getData().selectedPaymentMethod;
         },
 
         /**
+         * Setting the selected billing address pulled from persistence storage.
+         *
          * @param {Object} data
          */
         setSelectedBillingAddress: function (data) {
@@ -143,13 +164,17 @@ define([
         },
 
         /**
+         * Pulling the selected billing address from persistence storage.
+         *
          * @return {*}
          */
         getSelectedBillingAddress: function () {
             return getData().selectedBillingAddress;
         },
 
         /**
+         * Setting the billing address pulled from persistence storage.
+         *
          * @param {Object} data
          */
         setBillingAddressFromData: function (data) {
@@ -160,13 +185,16 @@ define([
         },
 
         /**
+         * Pulling the billing address from persistence storage.
          * @return {*}
          */
         getBillingAddressFromData: function () {
             return getData().billingAddressFromData;
         },
 
         /**
+         * Setting the billing address pulled from persistence storage for new customer.
+         *
          * @param {Object} data
          */
         setNewCustomerBillingAddress: function (data) {
@@ -177,13 +205,17 @@ define([
         },
 
         /**
+         * Pulling the billing address from persistence storage for new customer.
+         *
          * @return {*}
          */
         getNewCustomerBillingAddress: function () {
             return getData().newCustomerBillingAddress;
         },
 
         /**
+         * Pulling the email address from persistence storage.
+         *
          * @return {*}
          */
         getValidatedEmailValue: function () {
@@ -193,6 +225,8 @@ define([
         },
 
         /**
+         * Setting the email address pulled from persistence storage.
+         *
          * @param {String} email
          */
         setValidatedEmailValue: function (email) {
@@ -203,6 +237,8 @@ define([
         },
 
         /**
+         * Pulling the email input field value from persistence storage.
+         *
          * @return {*}
          */
         getInputFieldEmailValue: function () {
@@ -212,6 +248,8 @@ define([
         },
 
         /**
+         * Setting the email input field value pulled from persistence storage.
+         *
          * @param {String} email
          */
         setInputFieldEmailValue: function (email) {