<?php
namespace PHPCodez\Disableaddtocart\Helper;

use \Magento\Framework\App\Helper\AbstractHelper;
use \Magento\Customer\Model\Session;

class Data extends AbstractHelper {

protected $_customerSession;

public function __construct(Session $_customerSession) {
$this->_customerSession = $_customerSession;
}

public function getCustomerGroup(){
return $this->_customerSession->isLoggedIn()?$this->_customerSession->getCustomer()->getGroupId():0;
}


}