Clean code

app/code/Magento/Catalog/Ui/Component/ColumnFactory.php

@@ -6,6 +6,8 @@
 namespace Magento\Catalog\Ui\Component;
 
 /**
+ * Column Factory
+ *
  * @api
  * @since 100.0.2
  */
@@ -47,10 +49,14 @@ public function __construct(\Magento\Framework\View\Element\UiComponentFactory $
     }
 
     /**
+     * Create Factory
+     *
      * @param \Magento\Catalog\Api\Data\ProductAttributeInterface $attribute
      * @param \Magento\Framework\View\Element\UiComponent\ContextInterface $context
      * @param array $config
+     *
      * @return \Magento\Ui\Component\Listing\Columns\ColumnInterface
+     * @throws \Magento\Framework\Exception\LocalizedException
      */
     public function create($attribute, $context, array $config = [])
     {
@@ -82,7 +88,10 @@ public function create($attribute, $context, array $config = [])
     }
 
     /**
+     * Get Js Component
+     *
      * @param string $dataType
+     *
      * @return string
      */
     protected function getJsComponent($dataType)
@@ -91,14 +100,15 @@ protected function getJsComponent($dataType)
     }
 
     /**
+     * Get Data Type
+     *
      * @param \Magento\Catalog\Api\Data\ProductAttributeInterface $attribute
+     *
      * @return string
      */
     protected function getDataType($attribute)
     {
-        return isset($this->dataTypeMap[$attribute->getFrontendInput()])
-            ? $this->dataTypeMap[$attribute->getFrontendInput()]
-            : $this->dataTypeMap['default'];
+        return $this->dataTypeMap[$attribute->getFrontendInput()] ?? $this->dataTypeMap['default'];
     }
 
     /**
@@ -111,6 +121,6 @@ protected function getFilterType($frontendInput)
     {
         $filtersMap = ['date' => 'dateRange'];
         $result = array_replace_recursive($this->dataTypeMap, $filtersMap);
-        return isset($result[$frontendInput]) ? $result[$frontendInput] : $result['default'];
+        return $result[$frontendInput] ?? $result['default'];
     }
 }

app/code/Magento/Catalog/Ui/Component/Listing/Columns/Thumbnail.php

@@ -9,6 +9,8 @@
 use Magento\Framework\View\Element\UiComponent\ContextInterface;
 
 /**
+ * Class Thumbnail
+ *
  * @api
  * @since 100.0.2
  */
@@ -67,13 +69,15 @@ public function prepareDataSource(array $dataSource)
     }
 
     /**
+     * Get Alt
+     *
      * @param array $row
      *
      * @return null|string
      */
     protected function getAlt($row)
     {
         $altField = $this->getData('config/altField') ?: self::ALT_FIELD;
-        return isset($row[$altField]) ? $row[$altField] : null;
+        return $row[$altField] ?? null;
     }
 }

app/code/Magento/CatalogUrlRewrite/Model/ObjectRegistry.php

@@ -5,6 +5,9 @@
  */
 namespace Magento\CatalogUrlRewrite\Model;
 
+/**
+ * Class ObjectRegistry
+ */
 class ObjectRegistry
 {
     /**
@@ -26,15 +29,19 @@ public function __construct($entities)
     }
 
     /**
+     * Get Entity
+     *
      * @param int $entityId
      * @return \Magento\Framework\DataObject|null
      */
     public function get($entityId)
     {
-        return isset($this->entitiesMap[$entityId]) ? $this->entitiesMap[$entityId] : null;
+        return $this->entitiesMap[$entityId] ?? null;
     }
 
     /**
+     * List Entities
+     *
      * @return \Magento\Framework\DataObject[]
      */
     public function getList()

app/code/Magento/Customer/Block/Adminhtml/Edit/Tab/View/Sales.php

@@ -147,10 +147,12 @@ public function _beforeToHtml()
      */
     public function getWebsiteCount($websiteId)
     {
-        return isset($this->_websiteCounts[$websiteId]) ? $this->_websiteCounts[$websiteId] : 0;
+        return $this->_websiteCounts[$websiteId] ?? 0;
     }
 
     /**
+     * Returns Grouped Collection Rows
+     *
      * @return array
      */
     public function getRows()
@@ -159,6 +161,8 @@ public function getRows()
     }
 
     /**
+     * Return totals data
+     *
      * @return \Magento\Framework\DataObject
      */
     public function getTotals()
@@ -171,7 +175,9 @@ public function getTotals()
      *
      * @param float $price
      * @param null|int $websiteId
+     *
      * @return string
+     * @throws \Magento\Framework\Exception\LocalizedException
      */
     public function formatCurrency($price, $websiteId = null)
     {

app/code/Magento/Customer/Model/Address/AbstractAddress.php

@@ -230,7 +230,7 @@ public function getStreet()
     public function getStreetLine($number)
     {
         $lines = $this->getStreet();
-        return isset($lines[$number - 1]) ? $lines[$number - 1] : '';
+        return $lines[$number - 1] ?? '';
     }
 
     /**
@@ -271,7 +271,8 @@ public function setStreet($street)
      * Enforce format of the street field or other multiline custom attributes
      *
      * @param array|string $key
-     * @param null $value
+     * @param array|string|null $value
+     *
      * @return \Magento\Framework\DataObject
      */
     public function setData($key, $value = null)
@@ -286,6 +287,7 @@ public function setData($key, $value = null)
 
     /**
      * Check that address can have multiline attribute by this code (as street or some custom attribute)
+     *
      * @param string $code
      * @return bool
      */
@@ -403,6 +405,8 @@ public function getRegionCode()
     }
 
     /**
+     * Return Region ID
+     *
      * @return int
      */
     public function getRegionId()
@@ -425,6 +429,8 @@ public function getRegionId()
     }
 
     /**
+     * Return Country
+     *
      * @return int
      */
     public function getCountry()
@@ -502,6 +508,8 @@ public function getConfig()
     }
 
     /**
+     * Processing object before save data
+     *
      * @return $this
      */
     public function beforeSave()
@@ -516,10 +524,12 @@ public function beforeSave()
      *
      * @param int|null $defaultBillingAddressId
      * @param int|null $defaultShippingAddressId
+     *
      * @return AddressInterface
      * Use Api/Data/AddressInterface as a result of service operations. Don't rely on the model to provide
      * the instance of Api/Data/AddressInterface
      * @SuppressWarnings(PHPMD.CyclomaticComplexity)
+     * @throws \Magento\Framework\Exception\LocalizedException
      */
     public function getDataModel($defaultBillingAddressId = null, $defaultShippingAddressId = null)
     {
@@ -591,6 +601,8 @@ public function validate()
     }
 
     /**
+     * Create Region Instance
+     *
      * @return \Magento\Directory\Model\Region
      */
     protected function _createRegionInstance()
@@ -599,6 +611,8 @@ protected function _createRegionInstance()
     }
 
     /**
+     * Create Country Instance
+     *
      * @return \Magento\Directory\Model\Country
      */
     protected function _createCountryInstance()
@@ -608,6 +622,7 @@ protected function _createCountryInstance()
 
     /**
      * Unset Region from address
+     *
      * @return $this
      * @since 100.2.0
      */
@@ -617,26 +632,35 @@ public function unsRegion()
     }
 
     /**
+     * Is Company Required
+     *
      * @return bool
      * @since 100.2.0
+     * @throws \Magento\Framework\Exception\LocalizedException
      */
     protected function isCompanyRequired()
     {
         return ($this->_eavConfig->getAttribute('customer_address', 'company')->getIsRequired());
     }
 
     /**
+     * Is Telephone Required
+     *
      * @return bool
      * @since 100.2.0
+     * @throws \Magento\Framework\Exception\LocalizedException
      */
     protected function isTelephoneRequired()
     {
         return ($this->_eavConfig->getAttribute('customer_address', 'telephone')->getIsRequired());
     }
 
     /**
+     * Is Fax Required
+     *
      * @return bool
      * @since 100.2.0
+     * @throws \Magento\Framework\Exception\LocalizedException
      */
     protected function isFaxRequired()
     {

app/code/Magento/Fedex/Model/Carrier.php

@@ -986,6 +986,7 @@ public function getCode($type, $code = '')
      * Return FeDex currency ISO code by Magento Base Currency Code
      *
      * @return string 3-digit currency code
+     * @throws \Magento\Framework\Exception\NoSuchEntityException
      */
     public function getCurrencyCode()
     {
@@ -1008,7 +1009,7 @@ public function getCurrencyCode()
         ];
         $currencyCode = $this->_storeManager->getStore()->getBaseCurrencyCode();
 
-        return isset($codes[$currencyCode]) ? $codes[$currencyCode] : $currencyCode;
+        return $codes[$currencyCode] ?? $currencyCode;
     }
 
     /**
@@ -1438,6 +1439,8 @@ protected function _doShipmentRequest(\Magento\Framework\DataObject $request)
     }
 
     /**
+     * Return Tracking Number
+     *
      * @param array|object $trackingIds
      * @return string
      */
@@ -1452,10 +1455,10 @@ function ($val) {
     }
 
     /**
-     * For multi package shipments. Delete requested shipments if the current shipment
-     * request is failed
+     * For multi package shipments. Delete requested shipments if the current shipment request is failed
      *
      * @param array $data
+     *
      * @return bool
      */
     public function rollBack($data)
@@ -1475,6 +1478,7 @@ public function rollBack($data)
      * Return container types of carrier
      *
      * @param \Magento\Framework\DataObject|null $params
+     *
      * @return array|bool
      * @SuppressWarnings(PHPMD.CyclomaticComplexity)
      */
@@ -1542,6 +1546,7 @@ public function getContainerTypesFilter()
      * Return delivery confirmation types of carrier
      *
      * @param \Magento\Framework\DataObject|null $params
+     *
      * @return array
      * @SuppressWarnings(PHPMD.UnusedFormalParameter)
      */
@@ -1552,6 +1557,7 @@ public function getDeliveryConfirmationTypes(\Magento\Framework\DataObject $para
 
     /**
      * Recursive replace sensitive fields in debug data by the mask
+     *
      * @param string $data
      * @return string
      */
@@ -1569,6 +1575,7 @@ protected function filterDebugData($data)
 
     /**
      * Parse track details response from Fedex
+     *
      * @param \stdClass $trackInfo
      * @return array
      * @SuppressWarnings(PHPMD.CyclomaticComplexity)
@@ -1639,6 +1646,7 @@ private function processTrackingDetails(\stdClass $trackInfo)
 
     /**
      * Parse delivery datetime from tracking details
+     *
      * @param \stdClass $trackInfo
      * @return \Datetime|null
      */
@@ -1655,8 +1663,7 @@ private function getDeliveryDateTime(\stdClass $trackInfo)
     }
 
     /**
-     * Get delivery address details in string representation
-     * Return City, State, Country Code
+     * Get delivery address details in string representation Return City, State, Country Code
      *
      * @param \stdClass $address
      * @return \Magento\Framework\Phrase|string
@@ -1718,6 +1725,7 @@ private function processTrackDetailsEvents(array $events)
 
     /**
      * Append error message to rate result instance
+     *
      * @param string $trackingValue
      * @param string $errorMessage
      */
@@ -1759,8 +1767,7 @@ private function parseDate($timestamp)
     }
 
     /**
-     * Defines payment type by request.
-     * Two values are available: RECIPIENT or SENDER.
+     * Defines payment type by request. Two values are available: RECIPIENT or SENDER.
      *
      * @param DataObject $request
      * @return string