CaptchaFactory.php

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<?php
namespace Magento\Captcha\Model;

class CaptchaFactory
{
    protected $_objectManager;

    public function __construct(\Magento\Framework\ObjectManagerInterface $objectManager)
    {
        $this->_objectManager = $objectManager;
    }

    public function create($captchaType, $formId)
    {
        $className = 'Magento\Captcha\Model\\' . ucfirst($captchaType);

        $instance = $this->_objectManager->create($className, ['formId' => $formId]);
        if (!$instance instanceof \Magento\Captcha\Model\CaptchaInterface) {
            throw new \InvalidArgumentException(
                $className . ' does not implement \Magento\Captcha\Model\CaptchaInterface'
            );
        }
        return $instance;
    }
}