View.php

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<?php
namespace Magento\Customer\Helper;

use Magento\Customer\Api\CustomerNameGenerationInterface;
use Magento\Customer\Api\CustomerMetadataInterface;
use Magento\Customer\Api\Data\CustomerInterface;

class View extends \Magento\Framework\App\Helper\AbstractHelper implements CustomerNameGenerationInterface
{
    protected $_customerMetadataService;

    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        CustomerMetadataInterface $customerMetadataService
    ) {
        $this->_customerMetadataService = $customerMetadataService;
        parent::__construct($context);
    }

    public function getCustomerName(CustomerInterface $customerData)
    {
        $name = '';
        $prefixMetadata = $this->_customerMetadataService->getAttributeMetadata('prefix');
        if ($prefixMetadata->isVisible() && $customerData->getPrefix()) {
            $name .= $customerData->getPrefix() . ' ';
        }

        $name .= $customerData->getFirstname();

        $middleNameMetadata = $this->_customerMetadataService->getAttributeMetadata('middlename');
        if ($middleNameMetadata->isVisible() && $customerData->getMiddlename()) {
            $name .= ' ' . $customerData->getMiddlename();
        }

        $name .= ' ' . $customerData->getLastname();

        $suffixMetadata = $this->_customerMetadataService->getAttributeMetadata('suffix');
        if ($suffixMetadata->isVisible() && $customerData->getSuffix()) {
            $name .= ' ' . $customerData->getSuffix();
        }
        return $name;
    }
}