SwitchAction.php

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<?php
namespace Magento\Directory\Controller\Currency;

class SwitchAction extends \Magento\Framework\App\Action\Action
{
    public function execute()
    {
        $storeManager = $this->_objectManager->get(\Magento\Store\Model\StoreManagerInterface::class);
        $currency = (string)$this->getRequest()->getParam('currency');
        if ($currency) {
            $storeManager->getStore()->setCurrentCurrencyCode($currency);
        }
        $storeUrl = $storeManager->getStore()->getBaseUrl();
        $this->getResponse()->setRedirect($this->_redirect->getRedirectUrl($storeUrl));
    }
}